190 results on '"G. Moritz"'
Search Results
2. Formen der Erinnerung.: Ulrich von Hutten, Götz von Berlichingen, Sigmund von Herberstein
- Author
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Tilman G. Moritz
- Published
- 2019
3. Polyoxygenated Steroids from the Octocoral Leptogorgia punicea and in Vitro Evaluation of Their Cytotoxic Activity
- Author
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Maria Izabel G. Moritz, Lucas Lourenço Marostica, Éverson M. Bianco, Maria Tereza R. Almeida, João L. Carraro, Gabriela M. Cabrera, Jorge A. Palermo, Cláudia M. O. Simões, and Eloir P. Schenkel
- Subjects
Leptogorgia punicea ,octocoral ,polyoxygenated steroids ,cytotoxic effects ,A549 cells ,lung cancer cells ,Biology (General) ,QH301-705.5 - Abstract
Five new polyoxygenated marine steroids—punicinols A–E (1–5)—were isolated from the gorgonian Leptogorgia punicea and characterized by spectroscopic methods (IR, MS, 1H, 13C and 2-D NMR). The five compounds induced in vitro cytotoxic effects against lung cancer A549 cells, while punicinols A and B were the most active, with IC50 values of 9.7 μM and 9.6 μM, respectively. The synergistic effects of these compounds with paclitaxel, as well as their effects on cell cycle distribution and their performance in the clonogenic assay, were also evaluated. Both compounds demonstrated significant synergistic effects with paclitaxel.
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- 2014
- Full Text
- View/download PDF
4. Electromechanical Motion Systems: Design and Simulation
- Author
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Frederick G. Moritz
- Published
- 2013
5. Biological activities of marine invertebrates extracts from the northeast brazilian coast
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Flávio Henrique Reginatto, Cláudia Maria Oliveira Simões, Eloir Paulo Schenkel, E O Tabalipa, Cintia Lhullier, Naira Fernanda Zanchett Schneider, Leonel Vinicius Constantino, Mário Steindel, Ulisses Pinheiro, F N Sardá, Carlos D. Pérez, Milene Höehr de Moraes, and Maria Izabel G. Moritz
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atividade antimicrobiana ,marine invertebrates ,QH301-705.5 ,medicine.drug_class ,Science ,medicine.disease_cause ,01 natural sciences ,Enterococcus faecalis ,atividade antiprotozoárica ,anti-herpes activity ,atividade antiproliferativa ,medicine ,Animals ,Agar diffusion test ,Amphimedon compressa ,Biology (General) ,Trypanosoma cruzi ,Escherichia coli ,antimicrobial activity ,biology ,Traditional medicine ,Plant Extracts ,010405 organic chemistry ,antiproliferative effects ,antiprotozoal activity ,Botany ,Marine invertebrates ,biology.organism_classification ,Antimicrobial ,Anti-Bacterial Agents ,Porifera ,0104 chemical sciences ,atividade anti-herpética ,010404 medicinal & biomolecular chemistry ,QL1-991 ,invertebrados marinhos ,QK1-989 ,Antiprotozoal ,General Agricultural and Biological Sciences ,Zoology ,Brazil - Abstract
This paper reports the in vitro antiproliferative effects, antiprotozoal, anti-herpes and antimicrobial activities of 32 organic extracts of 14 marine sponges and 14 corals collected in northeast Brazilian coast. The ethanolic extracts of the sponges Amphimedon compressa and Tedania ignis, and the acetone extract of Dysidea sp. showed relevant results concerning the antiproliferative effects against A549, HCT-8, and PC-3 cell lines by sulforhodamine B assay, but also low specificity. Concerning the antiprotozoal screening, the ethanolic extract of Amphimedon compressa and the acetone and ethanolic extracts of Dysidea sp. were the most active against Leishmania amazonensis and Trypanosoma cruzi expressing β-galactosidase in THP-1 cells. In the preliminary anti-HSV-1 (KOS strain) screening, the ethanolic extracts of the sponges Amphimedon compressa, Haliclona sp. and Chondrosia collectrix inhibited viral replication by more than 50%. The most promising anti-herpes results were observed for the ethanolic extract of Haliclona sp. showing high selective indices against HSV-1, KOS and 29R strains (SI> 50 and >79, respectively), and HSV-2, 333 strain (IS>108). The results of the antibacterial screening indicated that only the ethanolic extract of Amphimedon compressa exhibited a weak activity against Enterococcus faecalis, Pseudomonas aeruginosa and Escherichia coli by the disk diffusion method. In view of these results, the extracts of Amphimedon compressa, Tedania ignis and Dysidea sp. were selected for further studies aiming the isolation and identification of the bioactive compounds with antiproliferative and/or antiprotozoal activities. The relevant anti-herpes activity of the ethanolic extract of Haliclona sp. also deserves special attention, and will be further investigated. Resumo Este artigo reporta as atividades in vitro antiproliferativa, atiprotozoárica, anti-herpética e antimicrobiana de 32 extratos orgânicos provenientes de 14 esponjas marinhas e 14 corais coletados no litoral nordestino brasileiro. Os extratos etanólicos das esponjas Amphimedon compressa e Tedania ignis, e o extrato acetônico de Dysidea sp. demonstraram resultados promissores em relação aos efeitos antiproliferativos frente as linhagens celulares A549, HCT-8, PC-3 pelo método da sulforrodamina B, mas sem especificidade. Em relação à atividade antiprotozárica, os extratos etanólico de Amphimedon compressa e acetônico e etanólico de Dysidea sp. apresentaram atividade contra Leishmania amazonensis e Trypanosoma cruzi através do método de expressão de β-galactosidase em células THP-1. Na investigação preliminar de atividade antiviral frente ao vírus Herpes simplex tipo 1 (cepa KOS), os extratos etanólicos das esponjas Amphimedon compressa, Haliclona sp. e Chondrosia collectrix inibiram mais de 50% da replicação viral. O extrato etanólico da esponja Haliclona sp. demonstrou resultados promissores para atividade anti-herpética com altos índices de seletividade para as cepas KOS (IS >50) e 29R (IS>79) frente ao VHS-1 e cepa 333 (IS>108) frente ao VHS-2. O extrato etanólico da esponja Amphimedon compressa exibiu uma pequena atividade contra Enterococcus faecalis, Pseudomonas aeruginosa and Escherichia coli pelo método de difusão em disco. De acordo com os resultados apresentados, os extratos das esponjas Amphimedon compressa, Tedania ignis e Dysidea sp. serão selecionados para futuros estudos de isolamento e identificação dos compostos bioativos para as atividades antiproliferativa e antiprozoárica. O extrato etanólico de Haliclona sp. será investigado por possuir atividade relevante anti-herpética.
- Published
- 2019
6. Autobiographik als ritterschaftliche Selbstverständigung
- Author
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Tilman G. Moritz
- Published
- 2019
- Full Text
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7. Autobiographik als ritterschaftliche Selbstverständigung : Ulrich von Hutten, Götz von Berlichingen, Sigmund von Herberstein
- Author
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Tilman G. Moritz and Tilman G. Moritz
- Subjects
- Identity (Philosophical concept)--Social aspects, Autobiography
- Abstract
In den Umbrüchen des frühen 16. Jahrhunderts hatte der ritterschaftliche Adel seinen gesellschaftlichen Vorrang gegen zahlreiche Einsprüche und Widerstände zu behaupten. Tilman G. Moritz zeigt anhand autobiographischer Erzählungen von Ulrich von Hutten (1488–1523), Götz von Berlichingen (um 1480–1562) und Sigmund von Herberstein (1486–1566), wie dies gelang und führt exemplarisch Krisen des Ritter-Seins und ihre innovative Beantwortung durch Texte vor. So offenbart sich ein entscheidender Zusammenhang zwischen Ritterschaft als Erinnerungs- und Handlungsgemeinschaft und ihrer narrativen Verfasstheit. German knights of the early 16th century had to face and cope with a number of challenges regarding their privileged role in society. How they prevailed is examined in this book by rereading autobiographical accounts. By the examples of Ulrich von Hutten (1480–1523), Götz von Berlichingen (c. 1480–1562), and Sigmund von Herberstein (1486–1566) it is demonstrated how the various crises of being a knight were innovatively solved in and by texts. This reveals a crucial interdependence between knighthood – as a community of shared memory and dispositions – and its narrative constitution.
- Published
- 2019
8. Study of CMOS THz pixels using different antenna geometries on metamaterial structures and in-pixel high-performances signal processing
- Author
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G. Moritz, François Gallée, Gilles Sicard, Jean-Alain Nicolas, Michel Ney, Nicolas Monnier, J.-P. Rostaing, Lab-STICC_IMTA_MOM_PIM, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), Institut Mines-Télécom [Paris] (IMT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-Institut Mines-Télécom [Paris] (IMT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL), Département Micro-Ondes (IMT Atlantique - MO), IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Lab-STICC_IMTA_MOM_DIM, École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Institut Mines-Télécom [Paris] (IMT)
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Signal processing ,Pixel ,business.industry ,Computer science ,Terahertz radiation ,Detector ,Metamaterial ,020206 networking & telecommunications ,02 engineering and technology ,021001 nanoscience & nanotechnology ,CMOS ,Stack (abstract data type) ,0202 electrical engineering, electronic engineering, information engineering ,Optoelectronics ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,Antenna (radio) ,0210 nano-technology ,business - Abstract
International audience; A study of different pixel implementations working around 300 GHz is presented. They are monolithically integrated in a standard low-cost CMOS process with a high performances read-out chain for signal processing. All the different pixel configurations are compliant with the integrated metal stack and the imposed density rules of the technology. A test-chip, composed of a total of 17 cases of study, will be evaluated including a matrix of 9×9 pixels allowing real-time imaging. Significant improvement has been made on the detector, thanks to antenna/nMOSFET codesign, and on the signal processing chain. A S11 of -18.2 dB with 5.8-dBi gain and a radiated front-to-back ratio of 10.1 dB are achieved regarding integrated antenna performances.
- Published
- 2017
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9. Superconducting dipole magnet for the CBM experiment at FAIR
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Pavel Akishin, Fernando Toral, P. Szwangruber, A.V. Shabunov, V. P. Ladygin, H. Ramakers, A. Bychkov, Alexander Malakhov, Yu. V. Gusakov, P. Senger, E. Floch, P. K. Kurilkin, and G. Moritz
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Physics ,010308 nuclear & particles physics ,QC1-999 ,Detector ,01 natural sciences ,Synchrotron ,law.invention ,Magnetic field ,Nuclear physics ,Baryon ,Momentum ,law ,Dipole magnet ,Magnet ,0103 physical sciences ,ddc:530 ,010306 general physics ,Beam (structure) - Abstract
XXIII International Baldin Seminar on High Energy Physics Problems, Baldin ISHEPP XXIII, Dubna, Russia, 19 Sep 2016 - 24 Sep 2016; The European physical journal / Web of Conferences 138, 12001 - (2017). doi:10.1051/epjconf/201713812001, The scientific goal of the CBM (Compressed Baryonic Matter) experiment at FAIR (Darmstadt) is to explore the phase diagram of strongly interacting matter at highest baryon densities. The physics program of the CBM experiment is complimentary to the programs to be realized at MPD and BMN facilities at NICA and will start with beam derived by the SIS100 synchrotron. The 5.15 MJ superconducting dipole magnet will be used in the silicon tracking system of the CBM detector. The magnet will provide a magnetic field integral of 1 Tm which is required to obtain a momentum resolution of 1% for the track reconstruction. The results of the development of dipole magnet of the CBM experiment are presented., Published by EDP Sciences, Les Ulis
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- 2017
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10. Polyoxygenated Steroids from the Octocoral Leptogorgia punicea and in Vitro Evaluation of Their Cytotoxic Activity
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Éverson Miguel Bianco, João Luís Carraro, Eloir Paulo Schenkel, Maria Tereza Rojo de Almeida, Lucas Lourenço Marostica, Gabriela Myriam Cabrera, Maria Izabel G. Moritz, Jorge Alejandro Palermo, and Cláudia Maria Oliveira Simões
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Lung Neoplasms ,Magnetic Resonance Spectroscopy ,Paclitaxel ,lung cancer cells ,Pharmaceutical Science ,Biology ,Pharmacology ,Article ,octocoral ,purl.org/becyt/ford/1 [https] ,chemistry.chemical_compound ,Leptogorgia punicea ,Cell Line, Tumor ,Drug Discovery ,purl.org/becyt/ford/1.4 [https] ,Animals ,Humans ,Cytotoxic T cell ,CYTOTOXICITY ,A549 cells ,Cytotoxicity ,Clonogenic assay ,lcsh:QH301-705.5 ,Pharmacology, Toxicology and Pharmaceutics (miscellaneous) ,A549 cell ,LEPTOGORGIA PUNICEA ,Cell Cycle ,Ciencias Químicas ,Drug Synergism ,Nuclear magnetic resonance spectroscopy ,OCTOCORALS ,Cell cycle ,Anthozoa ,In vitro ,polyoxygenated steroids ,POLYOXYGENATED STEROIDS ,cytotoxic effects ,Química Orgánica ,lcsh:Biology (General) ,chemistry ,Steroids ,CIENCIAS NATURALES Y EXACTAS - Abstract
Five new polyoxygenated marine steroids—punicinols A–E (1–5)—were isolated from the gorgonian Leptogorgia punicea and characterized by spectroscopic methods (IR, MS, 1H, 13C and 2-D NMR). The five compounds induced in vitro cytotoxic effects against lung cancer A549 cells, while punicinols A and B were the most active, with IC50 values of 9.7 μM and 9.6 μM, respectively. The synergistic effects of these compounds with paclitaxel, as well as their effects on cell cycle distribution and their performance in the clonogenic assay, were also evaluated. Both compounds demonstrated significant synergistic effects with paclitaxel. Fil: Moritz, Maria Izabel G.. Universidade Federal de Santa Catarina; Brasil Fil: Marostica, Lucas Lourenço. Universidade Federal de Santa Catarina; Brasil Fil: Bianco, Éverson M.. Universidade Federal de Santa Catarina; Brasil Fil: Rojo de Almeida, Maria Tereza. Universidade Federal de Santa Catarina; Brasil Fil: Carraro, João L.. Universidade Federal do Rio de Janeiro; Brasil Fil: Cabrera, Gabriela Myriam. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad de Microanálisis y Métodos Físicos en Química Orgánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de Microanálisis y Métodos Físicos en Química Orgánica; Argentina Fil: Palermo, Jorge Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad de Microanálisis y Métodos Físicos en Química Orgánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de Microanálisis y Métodos Físicos en Química Orgánica; Argentina Fil: Simoes, Cláudia M. O.. Universidade Federal de Santa Catarina; Brasil Fil: Schenkel, Eloir P.. Universidade Federal de Santa Catarina; Brasil
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- 2014
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11. Chemical and biological aspects of octocorals from the Brazilian coast
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Maria Izabel G. Moritz, Maria Tereza Rojo de Almeida, Carlos D. Pérez, K. C. C. Capel, and Eloir Paulo Schenkel
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Octocorallia ,biology ,Ecology ,lcsh:RS1-441 ,Aquatic animal ,biology.organism_classification ,Bioactivity ,Aquatic organisms ,Marine biodiversity ,Chemical ecology ,lcsh:Pharmacy and materia medica ,Pharmacology, Toxicology and Pharmaceutics(all) ,Genus ,Marine natural products ,parasitic diseases ,General Pharmacology, Toxicology and Pharmaceutics ,Brazilian Coast - Abstract
This review explores the chemical and biological aspects/results reported in the literature of the octocoral species collected at the Brazilian Coast. This article summarizes the biological activities (including pharmacological, antifouling and others related to chemical ecology) for the compounds and/or extracts described elsewhere. Data and references of compounds isolated from species belonging to the same genus, which have not been investigated in Brazil yet, are presented, emphasizing the importance for research in this area. Keywords: Bioactivity, Brazilian Coast, Marine biodiversity, Marine natural products, Octocorallia
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- 2014
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12. Anti-Infective Potential of Marine Invertebrates and Seaweeds from the Brazilian Coast
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Maria Tereza Rojo de Almeida, Mário Steindel, Maria Izabel G. Moritz, Caroline Rigotto, Paulo Antunes Horta, Francine Bittencourt, Flávio Henrique Reginatto, Tatiana da Rosa Guimarães, Éverson Miguel Bianco, João Luís Carraro, Eloir Paulo Schenkel, Cassandra Aresi, Cláudia Maria Oliveira Simões, Maiko L. Tonini, Lidiane Gouvea, Cintia D. L. Martins, Simone Quintana de Oliveira, and Fernando Scherner
- Subjects
marine invertebrates ,anti-HSV-1 activity ,medicine.drug_class ,Trypanosoma cruzi ,Antiprotozoal Agents ,Pharmaceutical Science ,Bugula neritina ,Leishmania braziliensis ,Article ,Enterococcus faecalis ,Analytical Chemistry ,Microbiology ,lcsh:QD241-441 ,lcsh:Organic chemistry ,Haliclona ,parasitic diseases ,Chlorocebus aethiops ,Drug Discovery ,medicine ,Animals ,antileishmanial activity ,MTT assay ,Urochordata ,Physical and Theoretical Chemistry ,antitrypanosomal activity ,Candida albicans ,Vero Cells ,antimicrobial activity ,Bacteria ,biology ,Cytotoxins ,Organic Chemistry ,marine natural products ,seaweeds ,Anthozoa ,Seaweed ,biology.organism_classification ,Antimicrobial ,Anti-Bacterial Agents ,Porifera ,Chemistry (miscellaneous) ,Antiprotozoal ,Molecular Medicine ,Brazil - Abstract
This manuscript describes the evaluation of anti-infective potential in vitro of organic extracts from nine sponges, one ascidian, two octocorals, one bryozoan, and 27 seaweed species collected along the Brazilian coast. Antimicrobial activity was tested against Staphylococcus aureus (ATCC 25923), Enterococcus faecalis (ATCC 29212), Pseudomonas aeruginosa (ATCC 27853), Escherichia coli (ATCC 25922) and Candida albicans (ATCC 10231) by the disk diffusion method. Antiprotozoal activity was evaluated against Leishmania braziliensis (MHOM/BR/96/LSC96-H3) promastigotes and Trypanosoma cruzi (MHOM/BR/00/Y) epimastigotes by MTT assay. Activity against intracellular amastigotes of T. cruzi and L. brasiliensis in murine macrophages was also evaluated. Antiviral activity was tested against Herpes Simplex Virus type 1 (HSV-1, KOS strain) by the plaque number reduction assay (IC50). Cytotoxicity on VERO cells was evaluated by the MTT assay (CC50). The results were expressed as SI = CC50/IC50. The most promising antimicrobial results were obtained against S. aureus and C. albicans with Dragmacidon reticulatum. Among the seaweeds, only Osmundaria obtusiloba showed moderate activity against P. aeruginosa. Concerning antiprotozoal activity, Bugula neritina, Carijoa riseii, Dragmaxia anomala and Haliclona (Halichoclona) sp. showed the most interesting results, mainly against extracellular promastigote forms of L. braziliensis (66, 35.9, 97.2, and 43.6% inhibition, respectively). Moreover, six species of seaweeds Anadyomene saldanhae, Caulerpa cupressoides, Canistrocarpus cervicornis, Dictyota sp., Ochtodes secundiramea, and Padina sp. showed promising results against L. braziliensis (87.9, 51.7, 85.9, 93.3, 99.7, and 80.9% inhibition, respectively), and only Dictyota sp. was effective against T. cruzi (60.4% inhibition). Finally, the antiherpes activity was also evaluated, with Haliclona (Halichoclona) sp. and Petromica citrina showing the best results (SI = 11.9 and SI > 5, respectively). All the active extracts deserve special attention in further studies to chemically characterize the bioactive compounds, and to perform more refined biological assays.
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- 2013
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13. Effects of different diets on oviposition rate ofFrankliniella occidentalis(Pergande) (Thysanoptera: Thripidae)
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G. Moritz, D. Steinbach, and S. Kumm
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Larva ,biology ,Hatching ,fungi ,food and beverages ,Plant Science ,Thripidae ,medicine.disease_cause ,biology.organism_classification ,Fecundity ,Western flower thrips ,Horticulture ,Insect Science ,Pollen ,parasitic diseases ,Botany ,medicine ,Instar ,Phaseolus - Abstract
Frankliniella occidentalis is a highly polyphagous and virus transmitting crop pest that feeds on leaves, fruits and pollen of plants across nearly a hundred plant families and several hundreds of plant species. To evaluate the influence of different diets on egg development and oviposition rate of females of Western Flower Thrips, four different food sources (sucrose solution, pine tree pollen, Phaseolus vulgaris and Chrysanthemum grandiflorum leave solutions) were tested under lab conditions. The oviposition rate, the embryogenesis and the hatching rate of first instar larvae were investigated and showed a strong dependency on the diet quality. The results demonstrate a highly positive effect of the used pollen and a remarkable negative trend of sucrose solution on the fecundity. Additionally, a continuous negative trend of the oviposition rate is visible in both leave solutions. A significantly higher hatching rate was observed in oviposited leaves of P. vulgaris compared to C. grandiflorum leaves. Mor...
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- 2012
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14. Effects of Ilex paraguariensis A. St. Hil. (Yerba Mate) on Herpes Simplex Virus Types 1 and 2 Replication
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Maria Izabel G. Moritz, Vanessa D. M. Müller, Débora Denardin Lückemeyer, Cláudia Maria Oliveira Simões, Patrícia Hermes Stoco, Célia Regina Monte Barardi, Flávio Henrique Reginatto, and Eloir Paulo Schenkel
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Pharmacology ,Viral Plaque Assay ,viruses ,Biology ,medicine.disease_cause ,Virology ,Molecular biology ,Immediate early protein ,food.food ,Virus ,Rutin ,chemistry.chemical_compound ,Herpes simplex virus ,food ,chemistry ,Viral entry ,Yerba-mate ,medicine ,MTT assay - Abstract
The antiherpes effects of the crude extract obtained from Ilex paraguariensis leaves (yerba mate) and their purified fractions were investigated. The most active fraction was selected and assayed to determine the viral multiplication steps upon which it acted. In order to detect the major components of this fraction, thin layer chromatography (TLC) analysis was performed. The antiviral activity was evaluated against HSV-1 and HSV-2 by a viral plaque number reduction assay (IC(50) ) and the cytotoxicity by a MTT assay (CC(50) ). According to the obtained results, all tested samples showed antiherpes activity at noncytotoxic concentrations, and the ethyl acetate fraction was the most active (SI = CC(50) /IC(50) = 188.7 and 264.7 for HSV-1 and HSV-2, respectively). The results also demonstrated that this fraction exerts antiviral activity by the reduction of viral infectivity, the inhibition of virus entry into cells and cell-to-cell virus spread, as well as by the impaired levels of ICP27, ICP4, gD and gE proteins of HSV-1. The TLC analysis showed that this fraction contains monodesmosidic triterpenoid saponins, matesaponin-1 (a bidesmosidic one), caffeic and chlorogenic acids and rutin, which suggests that they could act synergistically and be responsible for the detected antiherpes activity.
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- 2011
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15. Magnetic Field Design of the Dipole for Super-FRS at FAIR
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S.F. Han, Y. He, B. Zhang, B L Guo, Qinggao Yao, Shuo Zhang, H. Leibrock, Ping Yuan, G Moritz, X Q Zhang, W. Wu, X Wu, Lizhen Ma, Dongsheng Ni, and W.L. Zhan
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Physics ,business.industry ,Aperture ,Condensed Matter Physics ,Trim ,Electronic, Optical and Magnetic Materials ,Magnetic field ,Nuclear physics ,Dipole ,Optics ,Dipole magnet ,Magnet ,Facility for Antiproton and Ion Research ,Electrical and Electronic Engineering ,Nuclear Experiment ,business ,Virtual prototyping - Abstract
The Super-FRS (Super FRagment Separator) is a part of FAIR (Facility for Antiproton and Ion Research), which will be constructed at GSI, Germany by 17 countries. The Super-FRS comprises 24 superferric dipole magnets. The 2D and 3D magnetic field simulations of the prototype magnet are described in this paper. A passive trim slot and four chamfered removable poles are used to satisfy the required field homogeneity which is better than at 1.6 T, 0.8 T and 0.16 T in a wide elliptical useable aperture of 380 mm 140 mm. Measurement results at various field levels are shown in this paper as well. It can be seen from the comparison of calculation and measurement results that the magnetic designs of the magnet fulfils the requirements.
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- 2010
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16. SIS 300 Dipole Model
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G. Moritz, I.V. Bogdanov, L. Shirshov, V.V. Sytnik, A.A. Seletsky, L. Tkachenko, P.A. Shcherbakov, E Floch, Viktor Zubko, V Smirnov, V. Pokrovsky, H Mueller, and S. Kozub
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Physics ,Superconductivity ,Field (physics) ,Superconducting magnet ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Magnetic field ,Nuclear physics ,Dipole ,Electromagnetic coil ,Magnet ,Physics::Accelerator Physics ,Facility for Antiproton and Ion Research ,Electrical and Electronic Engineering - Abstract
FAIR (Facility for Antiproton and Ion Research), planned to be built at the site of GSI will include the 300 Tm fast-ramping heavy ion synchrotron SIS 300. In the frame of a collaboration between IHEP (Protvino, Russia) and GSI (Darmstadt, Germany) IHEP developed, produced and tested a superconducting model dipole. The main parameters of the dipole are a two-layer coil, 100 mm inner coil diameter and 1 m length. The magnet is designed for 6 T central magnetic field with a 1 T/s operating field ramp rate. The nominal operating current of 6720 A (6 T central magnetic field) was reached after the third quench and critical current of 7738 A (6.8 T central magnetic field) was reached after the eighteenth quench. The critical current of the dipole did not reduce up to ramp rate of 1300 A/s (1.15 T/s). AC losses for different magnetic field cycles were measured too.
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- 2010
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17. Design Study for the SIS 300 Main Quadrupoles
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E. Floch, Hans Mueller, G. Moritz, and Seong Yeub Shim
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Physics ,Design modification ,Condensed matter physics ,Nuclear engineering ,Superconducting magnet ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Magnetic field ,Dipole ,Magnet ,Quadrupole ,Design study ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,Nuclear Experiment ,Quadrupole magnet - Abstract
Various models for the main dipole of the SIS 300 have been manufactured by GSI and Brookhaven (GSI001), IHEP (a 1 m long 6 T model magnet currently under construction) and INFN (a 4.5 T curved magnet for the actual FODO lattice, also under construction). These different magnets reflect the design changes of the SIS 300 over the recent years. Based on the current lattice design studies for the main quadrupoles were started at GSI. In the presentation the actual status of the work on these magnets will be reviewed. Magnetic field quality, AC losses and quench protection aspects of the current design will be addressed.
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- 2009
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18. Design Study of the Multipole Corrector Magnet for SIS 100
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Kei Sugita, Hans Müller, Johann Macavei, Egbert Fischer, Hamlet Khodzhibagiyan, and G. Moritz
- Subjects
Physics ,Nuclotron ,Mechanical engineering ,Particle accelerator ,Superconducting magnet ,Condensed Matter Physics ,Sextupole magnet ,Electronic, Optical and Magnetic Materials ,law.invention ,Nuclear magnetic resonance ,law ,Dipole magnet ,Magnet ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,Quadrupole magnet ,Multipole expansion - Abstract
A design study of the multipole corrector magnet for the SIS 100 is in progress. This magnet, which has to integrate functions of a quadrupole, a sextupole and an octupole magnet, contains nested three windings to save longitudinal space in the accelerator ring. Although the windings are made from a Nuclotron type cable as for the SIS 100 main dipole magnet, insulated superconducting wires which are connected in series to allow low current operation, are used for the cable. In this paper, we describe the design principle and mechanical structure of the magnet and present computation results.
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- 2009
- Full Text
- View/download PDF
19. Quench Measurement on SIS100 Dipole Model
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A. Stafiniak, E. Floch, C. Schroeder, Egbert Fischer, F. Walter, F. Marzouki, Hanno Leibrock, and G. Moritz
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Physics ,Superconductivity ,Busbar ,Heating element ,Superconducting magnet ,Condensed Matter Physics ,Temperature measurement ,Integral equation ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Computational physics ,Dipole ,Nuclear magnetic resonance ,law ,Electrical and Electronic Engineering - Abstract
The international FAIR project planned next to G.S.I. (Germany) will lead to the construction of two superconducting synchrotrons (SIS100 and SIS300). This article reports on the quench calculations and measurements performed on one short SIS100 dipole model (1.4 m), the first to be tested at the FAIR prototype test facility. Quench propagation velocities and time to reach the 0.2 V quench threshold were measured in the bus bars and compared to computed values. The hotspot temperature was measured for different Miits (integral of I2 .dt) values at 6 and 8 kA and compared to temperatures computed with the Miits equation. This article also reports the use of one inductive spot heater.
- Published
- 2009
- Full Text
- View/download PDF
20. The status of the Super-FRS in-flight facility at FAIR
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M. Tomut, W. R. Plass, C. Karagiannis, D. Boutin, H. Leibrock, W. Hüller, G. Moritz, Mikhail I. Yavor, Bettina Lommel, Herbert A. Simon, J. S. Winfield, A. Brünle, A. Kelic, M. Gleim, C. Scheidenberger, M. Winkler, C. Nociforo, H. Geissel, K. Sümmerer, B. Achenbach, Helmut Weick, C. Mühle, G. Münzenberg, Naeem A. Tahir, Anna Tauschwitz, E. Kozlova, Birgit Kindler, and K.-H. Behr
- Subjects
Nuclear and High Energy Physics ,Range (particle radiation) ,Fission ,chemistry.chemical_element ,Superconducting magnet ,Uranium ,Nuclear physics ,Dipole ,chemistry ,Antiproton ,Magnet ,Physics::Accelerator Physics ,Nuclear Experiment ,Instrumentation ,Beam (structure) - Abstract
The future international facility FAIR (Facility for Antiprotons and Ion Research) will deliver beams of all ions up to uranium with intensities of up to 1012 ions/s. At FAIR it will be possible to perform experiments in different fields of physics. A wide range of ions with energies up to 1.5 A GeV will be used for the production of fragments by projectile fragmentation/fission at the in-flight fragment separator, Super-FRS. Rare isotopes of all elements up to uranium will be produced and spatially separated within a few hundred nanoseconds, enabling the study of very short-lived nuclei. The Super-FRS is a large-acceptance device utilizing large-aperture superconducting magnets and employing multiple degrader stages to provide monoisotopic nuclear beams. It serves different experimental branches including a new storage-cooler ring system. Because of high primary beam intensity a challenging design of the target area and the components used in the first dipole stage of the Super-FRS is necessary. These efforts include high-power production targets, beam dumps to catch the remaining primary beam and radiation resistant magnets. In this contribution we present the status of the project.
- Published
- 2008
- Full Text
- View/download PDF
21. Development of a Curved Fast Ramped Dipole for FAIR SIS300
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Giorgio Bellomo, P. Fabbricatore, U. Gambardella, Riccardo Musenich, S. Farinon, J. Kaugerts, G. Moritz, G. Volpini, Massimo Sorbi, F. Alessandria, and R. Marabotto
- Subjects
Cryostat ,Physics ,business.industry ,Superconducting magnet ,Radius ,Condensed Matter Physics ,Curvature ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Dipole ,Optics ,Nuclear magnetic resonance ,Electromagnetic coil ,law ,Magnet ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,business - Abstract
At present, one of the main options for beam bending dipoles of the SIS 300 synchrotron, under design for the FAIR facility at GSI, is a single layer magnet 7.8 m long, 100 mm in bore diameter, generating 4.5 T. This coil has two main features: it is curved, with a curvature radius of 66.67 m (the corresponding sagitta is 114 mm), and shall be ramped at 1 T/s. Both these characteristics demand challenging RD 2) the technological developments (at the industrial level) for defining and optimizing the dipole constructing methods; 3) the construction of curved dipole coil winding models; 4) the construction of the complete curved dipole; 5) the test of the curved dipole in a vertical cryostat; 6) the integration of the curved dipole into a horizontal cryostat, for the final test at GSI.
- Published
- 2008
- Full Text
- View/download PDF
22. Commissioning of the Prototype Test Facility for Rapidly-Cycling Superconducting Magnets for FAIR
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C. Schroeder, F. Walter, Pierre Schnizer, A. Stafiniak, F. Marzouki, P. Hahne, G. Walter, M. Kauschke, G. Moritz, Horst Welker, E. Floch, G. Hess, F. Klos, Hans Mueller, and M. Rebscher
- Subjects
Cryostat ,Materials science ,Nuclear engineering ,Refrigerator car ,Refrigeration ,Superconducting magnet ,Cryogenics ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Nuclear magnetic resonance ,Power electronics ,Magnet ,Water cooling ,Electrical and Electronic Engineering - Abstract
For testing rapidly-cycled superconducting magnets in the framework of the FAIR project (Facility for Antiprotons and Ion Research) a test facility was set up at GSI to test model and prototype superconducting magnets for different machines (SIS100, SIS300, Super-FRS). We are able to perform the following magnet tests: quench training, magnetic measurements, measurements of AC losses (calorimetric and V-I methods), temperature distributions in the magnet, and long-term stability tests. The forced-flow and bath-cooled scheme can be applied for the superconducting magnets. The facility consists of the following components: a refrigerator (400 W at 4 K); a distribution box for different cooling schemes (supercritical and two-phase flow); 2 feed-boxes providing electrical and cryogenic supply for the magnets; an all-purpose horizontal magnet cryostat which can be used for all kinds of different magnets (max. 3 m length and 0.8 m diameter); a power converter (11 kA) including the quench protection system; a quench detection system adapted from the LHC-series test facilities. The results of the AC loss measurements and the quench training for the first tested superconducting magnet are presented.
- Published
- 2008
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- View/download PDF
23. Transient Finite-Element Simulation of the Eddy-Current Losses in the Beam Tube of the SIS-100 Magnet During Ramping
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H. De Gersem, Stephan Koch, G. Moritz, S.Y. Shim, Thomas Weiland, and Egbert Fischer
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Materials science ,Aperture ,Mechanics ,Superconducting magnet ,Condensed Matter Physics ,Magnetic flux ,Electronic, Optical and Magnetic Materials ,law.invention ,Magnetic field ,Nuclear magnetic resonance ,law ,Dipole magnet ,Magnet ,Eddy current ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,Electrical conductor - Abstract
The field quality of the GSI SIS-100 magnet is influenced by the eddy currents generated in the conductive beam tube during ramping. The eddy-current losses are computed on the basis of a transient 2D finite-element model. A sufficient accuracy is guaranteed by adaptively refining the mesh and by the use of error-controlled adaptive time integrators. The 2D model is accomplished by an analytical model dealing with the closing of the currents at the end parts of the beam tube and thus incorporating the most significant 3D effect. The time dependence of the field quality reveals significant differences at low aperture fields, especially for the sextupole component at the beginning of the ramping. Also without conductive beam tube and for low field values, the relative sextupole and decapole components depend on the magnitude of the field, which indicates the presence of a nonlinear effect. When the magnet operates at an injection field, the magnetic flux density in the bridge of the iron yoke is already saturated. Hence, the saturation pattern in and around this bridge changes immediately at the start of the ramping, resulting in a changing field quality.
- Published
- 2008
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24. Low-Loss NbTi Rutherford Cable for Application to the SIS-300 Dipole Magnet Prototype
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Massimo Sorbi, J. Kaugerts, F. Alessandria, P. Fabbricatore, G. Moritz, S. Farinon, Giorgio Bellomo, G. Volpini, M.N. Wilson, and U. Gambardella
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Rutherford cable ,Materials science ,Negative-bias temperature instability ,Nuclear engineering ,Superconducting magnet ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Dipole ,Nuclear magnetic resonance ,Dipole magnet ,law ,Electromagnetic coil ,Magnet ,Electrical and Electronic Engineering - Abstract
INFN (Istituto Nazionale di Fisica Nucleare, Italy) has started in 2006 the DISCORAP project, which foresees the design, manufacture and test of a dipole prototype for the SIS-300 synchrotron of the FAIR facility at GSI. In order to minimize the losses produced by the fast ramp rate (1 T/s) at which the magnet is operated, we are developing with European industries, a Rutherford cable which incorporates several technologies to reduce the losses, and namely a NbTi filament diameter on the order of 2.5-3.5 mum, Cu 0.5 wt%Mn interfilamentary matrix and stainless steel core. In this paper we present the design principles and the first experimental results; we also analyze the impact of the CuMn paramagnetism on the field distortion at the different operating magnetic fields.
- Published
- 2008
- Full Text
- View/download PDF
25. Irradiation of Bypass Diodes up to 2.2E14 Neutron/cm$^{2}$ and 1.3 kGy for the FAIR Project
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G. Moritz, A. V. Kantsyrev, G. N. Smirnov, E. Mustafin, Vyacheslav F. Batyaev, E. Floch, Yu. E. Titarenko, V. I. Rogov, D. Hagedorn, A. Gharib, N. Markov, A. Smolyakov, A. A. Golubev, S. P. Borovlev, and H. Ramakers
- Subjects
Physics ,Large Hadron Collider ,Physics::Instrumentation and Detectors ,Radiation ,Condensed Matter Physics ,Fluence ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Nuclear physics ,Nuclear magnetic resonance ,Neutron flux ,law ,Neutron ,Irradiation ,Electrical and Electronic Engineering ,Diode - Abstract
The FAIR project planned at G.S.I. (Germany) requires the construction of several superconducting accelerator rings. One of the two synchrotron rings, named SIS300, will have dipoles with a central field of 6 T and a ramp rate of 1 T/s. In order to protect these fast-ramping magnets in case of a quench, each of them must be equipped with a diode stack that bypasses the magnet in case it quenches. In order to save time and money on R&D, we decided to use the same diode type as that mounted in LHC magnets. These diodes were previously tested at 77 K up to a fast neutron fluence (F) of 2.8E13 n/cm2 and a dose (D) of 2 kGy which are the expected radiation loads after 20 years of LHC operation. Having no definitive estimation of the losses in the SIS300, we arbitrarily targeted a fluence of 1E14 n/cm2. We irradiated six LHC type diodes at 77 K in six steps. The highest values measured were 1.31 kGy and 2.25E14 n/cm2. Before and after each irradiation step, the forward and reverse voltage characteristics of each diode were measured. This paper reports the results of these measurements, carried out at ITEP (Moscow).
- Published
- 2007
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- View/download PDF
26. Magnetic and Thermal Characteristics of a Model Dipole Magnet for the SIS 300
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G. Moritz, Stephan Russenschuck, J. Kaugerts, Davide Tommasini, E. Floch, L. Tkachenko, Bernhard Auchmann, S. Kozub, and Viktor Zubko
- Subjects
Physics ,Condensed matter physics ,Superconducting magnet ,Condensed Matter Physics ,Magnetic hysteresis ,Electronic, Optical and Magnetic Materials ,Magnetic field ,Dipole ,Dipole magnet ,Electromagnetic coil ,Magnet ,Physics::Accelerator Physics ,Facility for Antiproton and Ion Research ,Electrical and Electronic Engineering ,Atomic physics - Abstract
The synchrotron SIS 300, developed for the Facility for Antiproton and Ion Research (FAIR) project at GSI, will use fast-cycling dipoles with 100 mm inner diameter coils, magnetic field amplitude of 6 T and a ramp rate of 1 T/s. This work presents the calculations of the magnetic and thermal characteristics of a 1 m model dipole with optimized 2D and 3D geometries. AC losses in the coil and iron yoke, as well as temperature margins, were analyzed. Production tolerances for the main geometrical parameters were also studied.
- Published
- 2007
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- View/download PDF
27. Cable Design for FAIR SIS 300
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L. Tkachenko, G. Moritz, A.K. Ghosh, J. Kaugerts, S. Kozub, G. Volpini, P.A. Shcherbakov, M.N. Wilson, I.V. Bogdanov, P. Fabbricatore, L. Shirshov, Gerard Willering, D. Richter, A. den Ouden, and Arjan Verweij
- Subjects
Rutherford cable ,Materials science ,Superconducting magnet ,Condensed Matter Physics ,Magnetic hysteresis ,IR-59843 ,Electronic, Optical and Magnetic Materials ,law.invention ,Nuclear magnetic resonance ,law ,Electromagnetic coil ,Magnet ,Eddy current ,Facility for Antiproton and Ion Research ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,Composite material ,Electrical conductor - Abstract
GSI, Darmstadt is preparing to build FAIR (Facility for Antiproton and Ion Research) which include SIS 300, a 300T - m fast-ramping heavy ion synchrotron. Dipoles for this ring will be 2.9 m long, producing 6 T over a 100 mm coil aperture and ramped at 1 T/s. The cable for these dipoles must have low losses and produce acceptable field distortions during the fast ramp. We plan to achieve this objective by using fine (~ 3 mum) filaments of NbTi in a wire with an interfilamentary matrix of CuMn to reduce proximity coupling and increase the transverse resistivity. The Rutherford cable have a thin stainless steel core and the wires will be coated with SnAg solder which has been oxidized, using a recipe similar to that developed at CERN, to increase the adjacent strand resistance Ra. Measurements of crossover strand resistance Re and Ra in cored cable with oxidized SnAg coating will be presented, together with data on critical current, persistent current magnetization and eddy current coupling in a wire with ultra fine filaments and a CuMn matrix in the interfilamentary region of the wire. These data will be used to predict losses and field distortion in the SIS 300 dipole and optimize the final design of cable for FAIR.
- Published
- 2007
- Full Text
- View/download PDF
28. Status of the Design of a Full Length Superferric Dipole and Quadrupole Magnets for the FAIR SIS 100 Synchrotron
- Author
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A. Kalimov, Egbert Fischer, G. Kuznetsov, V. Seleznev, C. Muehle, Alexander Alfeev, Hamlet Khodzhibagiyan, G. Moritz, and Alexander Kovalenko
- Subjects
Physics ,Nuclotron ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Nuclear physics ,Dipole ,law ,Dipole magnet ,Magnet ,Quadrupole ,Physics::Accelerator Physics ,Facility for Antiproton and Ion Research ,Physics::Atomic Physics ,Electrical and Electronic Engineering ,Quadrupole magnet - Abstract
The synchrotron SIS100 is one of the two basic accelerators of the future Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt. The SIS100 should provide acceleration of high intensity U28+ and proton beams for 0.5 s, with a pulse repetition rate of 0.6 Hz. In the accelerator magnetic system superferric 2 T dipoles of about 3 m length and 32 T/m quadrupoles of about 1 m length will be used. The magnet coils are made from hollow NbTi composite cable cooled with two phase helium flow at 4.5 K. The lattice comprises 108 dipoles and 168 quadrupoles. The elliptic beam pipe inner dimensions have been fixed at 130 times 60 mm2 for the dipole and 135 times 65 mm2 for the quadrupole. Both the dipole and quadrupole design approaches are based on improved versions of the original Nuclotron fast-cycling magnets and provide significantly less AC loss at 4.5 K, better quality of the magnetic field, and a higher long-term mechanical stability of the magnet coils. The results are based on the investigation of 1.4 m dipole and 0.4 m quadrupole Nuclotron-type magnet models. The status of the new magnets design and its manufacturing are presented. Essential features and new results are discussed.
- Published
- 2007
- Full Text
- View/download PDF
29. Mechanical Coil Structure of the FAIR SIS 100 Magnets
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D. Krischel, W. Walter, Hamlet Khodzhibagiyan, M.. Gehring, A.. Nyilas, W. Gärtner, R. Burgmer, P. Schmidt, A.. Wessner, G. Moritz, Egbert Fischer, and Alexander Kovalenko
- Subjects
Materials science ,Mechanical engineering ,Superconducting magnet ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Conductor ,Nuclear magnetic resonance ,Electromagnetic coil ,Magnet ,Water cooling ,Electrical and Electronic Engineering ,Electrical conductor ,Coil tap ,Rogowski coil - Abstract
The SIS 100 magnets of the Nuclotron-type are fast- pulsed superferric cold iron magnets. The dipole coil is a double layer saddle-shaped coil with 16 turns. The cable is a hollow tube NbTi composite cable of about 7.2 mm outer diameter, cooled with two phase helium flow at 4.5 K. A 2D structural analysis of the dipole cross section has been performed to determine the stress levels in the components of the coil package and to suggest an appropriate support structure for the conductor. Different design proposals with the focus on limiting stress in the CuNi cooling tubes and on feasibility of industrial manufacturing procedures have been conceived and analysed. The chosen coil support structure (substrate or "comb"), together with new insulation and modification of the winding scheme, seems to be an appropriate way to stabilize the coil better and offers important advantages like precise positioning of the conductor, more uniform distribution of loads on the CuNi tubes, an easier winding process on a guiding support, and simplified production procedures. Samples of the new coil structure were produced and tested. The obtained results are presented and discussed.
- Published
- 2007
- Full Text
- View/download PDF
30. Optimization of a Dipole With Partially Keystoned Cable for the SIS 300
- Author
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Davide Tommasini, P. Shcherbakov, L. Tkachenko, S. Kozub, I. Bogdanov, Viktor Zubko, G. Moritz, and C. Muehle
- Subjects
Physics ,Large Hadron Collider ,Field (physics) ,Aperture ,Superconducting magnet ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Magnetic field ,Computational physics ,Dipole ,Nuclear magnetic resonance ,law ,Physics::Accelerator Physics ,Facility for Antiproton and Ion Research ,Electrical and Electronic Engineering - Abstract
The last stage of the GSI Fast-Pulsed Synchrotron Project for FAIR (Facility for Antiproton and Ion Research) is the SIS 300 ring, which will use superconducting dipoles with 100mm aperture, 6 T magnetic field amplitude and 1 T/s field ramp rate. Stringent requirements on physical parameters and on the dependable service of the dipole necessitated using a cable with increased current carrying capability and low dynamic losses. A suitable geometry of the superconducting cable was found in that used for the outer layer of the Large Hadron Collider superconducting main dipole, supplemented by a stainless steel core for the reduction of the transverse contact resistance between the strands. The shape of the partially keystoned cable demands numerical methods for the optimization of the geometry in adaptation to the wide aperture dipole. The main characteristics of the optimized 2D and 3D geometry of the dipole are presented. Two grades of iron yoke steel were analyzed for use, in view of their resulting field quality. Thermal analysis of the dipole was carried out
- Published
- 2006
- Full Text
- View/download PDF
31. New Results on Minimizing AC Power Losses in a Fast Cycling 2 T Superferric Dipole With a Cold Yoke
- Author
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Egbert Fischer, G. Kuznetsov, N.N. Agapov, Hamlet Khodzhibagiyan, G. Moritz, Alexander Kovalenko, and Alexander Smirnov
- Subjects
Physics ,Nuclotron ,Superconducting magnet ,AC power ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Nuclear physics ,Dipole ,Nuclear magnetic resonance ,law ,Magnet ,Eddy current ,Electrical and Electronic Engineering ,Yoke - Abstract
New results from the investigation of 2 T superferric model dipoles operating at 4 T/s, 1 Hz are presented. The works are performed within the R&D program on the design of the SIS100 synchrotron at GSI in Darmstadt. One of the main research goals is minimization of overall AC power losses in the magnet at 4 K level. Different modifications of the dipole were proposed and tested experimentally. By the present time, the losses are reduced to about 17 W/m of the magnet length, while the reference Nuclotron dipole produces about 38 W/m in the same operating mode. Essential design details of the model magnets are described and further R&D steps are outlined
- Published
- 2006
- Full Text
- View/download PDF
32. Design of a Superferric Quadrupole Magnet With a High Field Gradient
- Author
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E. Fischer, A. Kalimov, G. Moritz, C. Muehle, P. Shcherbakov, and R. Kurnyshov
- Subjects
Physics ,business.industry ,Superconducting magnet ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Optics ,Nuclear magnetic resonance ,law ,Dipole magnet ,Magnet ,Quadrupole ,Eddy current ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,business ,Quadrupole magnet ,Gradient method - Abstract
FAIR, a new international accelerator complex is now being developed by GSI (Darmstadt, Germany). The synchrotron SIS100 is a part of this complex and will be equipped exclusively with fast-cycling superferric magnets. The magnet system of this accelerator includes 168 identical quadrupoles with a maximum gradient of 33.4 T/m in an elliptical useable aperture of 120 mm times 65 mm. An important requirement of the quadrupole design is a field gradient uniformity better than plusmn0.06% for field gradient variation range of 3 T/m-3.3 T/m. This goal is achieved by introducing slots in the central part of the magnet poles, creating the effect of artificial saturation. Simultaneously, these slots reduce the eddy currents in the yoke, induced by the current ramp in the magnet coil. This is important because the whole magnet will be operated near 4.2 K, so the power loss in the yoke should be minimized. Additionally, the shape of the quadrupole pole ends was optimized to provide the necessary integral field quality
- Published
- 2006
- Full Text
- View/download PDF
33. Tests of Straight and Bent Superconducting Dipoles
- Author
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V. Pokrovsky, L. Shirshov, L. Tkachenko, S. Kozub, V. Sytnik, I. Bogdanov, Viktor Zubko, G. Moritz, P. Shcherbakov, and J. Kaugerts
- Subjects
Physics ,Bent molecular geometry ,Radius ,Superconducting magnet ,Condensed Matter Physics ,Curvature ,Electronic, Optical and Magnetic Materials ,Nuclear physics ,Dipole ,Electromagnetic coil ,Magnet ,Physics::Accelerator Physics ,Facility for Antiproton and Ion Research ,Electrical and Electronic Engineering ,Atomic physics - Abstract
An important part of FAIR (Facility for Antiproton and Ion Research), being developed at GSI, Darmstadt, Germany, is the fast-ramping heavy ion synchrotron SIS 300. The main elements of the SIS 300 magnetic system are 6 T, 2.6 m long superconducting dipoles, to guide charged particle beams on a path with a 50 m curvature radius. A model superconducting dipole, manufactured for the UNK project, was chosen to study the influence of bending on the magnet characteristics. The straight collared coil of this model magnet was tested, then bent with a 50 m curvature radius, and then retested. The main measured and calculated characteristics of the coil for both tests are presented. Test results showed similar characteristics, both in training and in ramp rate dependence, as well as in field quality of the straight and bent coils. There is a good agreement between measured and calculated results of the completed study
- Published
- 2006
- Full Text
- View/download PDF
34. Development and Test of a Miniature Novel Cable-In-Conduit-Conductor for Use in Fast Ramping Accelerators With Superconducting Magnets
- Author
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Egbert Fischer, V.E. Sytnikov, L. Bottura, G. Moritz, S. Egorov, Igor Rodin, A. Rychagov, V.E. Korsunsky, M.N. Wilson, M. Kauschke, Vitaly S. Vysotsky, and A. Taran
- Subjects
Electrical conduit ,Rigidity (electromagnetism) ,Materials science ,Stability margin ,Miniaturization ,Mechanical engineering ,Superconducting magnet ,Electrical and Electronic Engineering ,Technology development ,Condensed Matter Physics ,Electrical conductor ,Electronic, Optical and Magnetic Materials ,Conductor - Abstract
The results of the technology development and first tests of the samples of the novel CICC are presented and discussed. The miniature CICC consists of thirty 0.5 mm NbTi strands inside a conduit with an outer diameter of 6.4 mm and has a projected operating current not less than 6 kA. The conductor design uses the well known and proven CICC technology. This new design looks very attractive, with several possible advantages, such as increased conductor stability margin and better mechanical rigidity of the conductor. Before N-CICC development the preliminary predictive analysis was done to justify the new conductor concept
- Published
- 2006
- Full Text
- View/download PDF
35. Radiation Resistant Quadrupole Magnet for the Super-FRS at FAIR
- Author
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G. Moritz, K.-H. Behr, Helmut Weick, M. Winkler, Hans Geissel, C. Mühle, H. Iwase, and M. Svedentsov
- Subjects
Physics ,Superconducting magnet ,Radiation ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,law.invention ,Nuclear physics ,law ,Magnet ,Physics::Accelerator Physics ,Facility for Antiproton and Ion Research ,Neutron ,Beam dump ,Electrical and Electronic Engineering ,Nuclear Experiment ,Quadrupole magnet ,Beam (structure) - Abstract
The planned new international accelerator facility FAIR (Facility for Antiproton and Ion Research, ) at GSI will provide primary beams of all projectiles up to uranium with energies up to 1.5 GeV/u for nuclear structure physics. The maximum intensities of these projectile beams will be (1-3) 1012/s, leading to a maximum beam power of 58 kW. 10-20% of the primary beam will react in a high-power production target at the entrance of the Super-FRS (Super-conducting Fragment Separator, ). The Super-FRS is a large-acceptance two-stage fragment separator which will provide spatially separated isotopic beams of exotic nuclei. The non-reacting primary beam will be dumped at dedicated beam catchers, located at well defined places in the first part of the Super-FRS. The target area as well as the beam dump area is in high fluxes of high-energy particles, mainly neutrons and protons. Since magnetic elements located in these areas have to be reliably operated for the lifetime of the facility (~20 years) their design has to be radiation resistant. Presently we consider building the magnet coils using MIC (Mineral Insulation Cable) technology. In this paper we present radiation issues, magnet specification, and possible magnetic designs of the first quadrupole magnet placed 1 m downstream of the production target
- Published
- 2006
- Full Text
- View/download PDF
36. Simulation of Eddy-Current Losses in a Fast Ramped Superconductive Dipole Magnet
- Author
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Thomas Weiland, Egbert Fischer, G. Moritz, H. De Gersem, and Stephan Koch
- Subjects
Physics ,Condensed matter physics ,Numerical analysis ,Superconducting magnet ,Mechanics ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,law.invention ,Nonlinear system ,Dipole ,Multigrid method ,law ,Dipole magnet ,Magnet ,Eddy current ,Electrical and Electronic Engineering - Abstract
The eddy-current losses in the yoke of a superconductive dipole magnet are simulated using a transient, magnetoquasistatic formulation discretized in 3D by the finite integration technique. The laminated yoke material is modeled by an anisotropic, nonlinear material characteristic. The system is linearized by the successive approximation technique with backtracking and solved by a curl-curl algebraic multigrid solver. The results show the complex interaction between ferromagnetic saturation and eddy currents
- Published
- 2006
- Full Text
- View/download PDF
37. 3-D Transient Process Calculations For Fast Cycling Superferric Accelerator Magnets
- Author
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R. Kurnyshov, G. Moritz, P. Shcherbakov, and E. Fischer
- Subjects
Physics ,Nuclotron ,Nuclear engineering ,Superconducting magnet ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Magnetic field ,law.invention ,Nuclear magnetic resonance ,law ,Electromagnetic coil ,Magnet ,Eddy current ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,Magnetic levitation ,Yoke - Abstract
Fast cycling superferric magnets are planned for use in the new International Accelerator Facility for Antiprotons and Ion Research (FAIR) at GSI, Darmstadt. The efficiency of this magnet is basically defined by the AC loss at liquid helium temperatures in the construction elements of the dipoles and quadrupoles (iron yoke, coil, beam pipe restraints and suspension). A detailed knowledge of the 3D magnetic field, the eddy current distributions and their transient behavior is necessary to minimize the hysteresis and the eddy current losses through the use of an appropriate design. Methodical problems are considered for finite element calculations (ANSYS) of eddy currents in a laminated iron yoke. The results for window-frame dipoles and quadrupoles of the Nuclotron type are given. We present the influence of nonlinear and anisotropic magnetic and electrical properties of laminated steel and of bulk restraint elements
- Published
- 2006
- Full Text
- View/download PDF
38. Design and Test of a Hollow Superconducting Cable Based on Keystoned NbTi Composite Wires
- Author
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Egbert Fischer, Alexander Kovalenko, G.P. Vedernikov, L.V. Potanina, Hamlet Khodzhibagiyan, G. Moritz, and A. K. Shikov
- Subjects
Dipole ,Materials science ,Aperture ,Magnet ,Tube (fluid conveyance) ,Superconducting magnet ,Electrical and Electronic Engineering ,Composite material ,Condensed Matter Physics ,Electrical conductor ,Electronic, Optical and Magnetic Materials ,Conductor ,Magnetic field - Abstract
The data from the investigation of hollow superconducting cable based on keystoned NbTi wires are presented. The cable sample, consisting of 15 wires wound around a cooper-nickel tube 5 mm in diameter and cooled with two-phase helium flow has operated inside the magnet aperture at a current of 13.4 kA and the current ramp rate of 26.8 kA/s. The external magnetic field value was about 2 T and the field ramp rate of 4 T/s. The pulse repetition rate of 1 Hz was provided. The first 650 m of the new wire was manufactured based on the improved technology. A piece of hollow cable 40 m in length was fabricated. The outer cable diameter with electric insulation is 7.34 mm. A test winding for a 1.4 m superferric nucleotron-type window frame model dipole for SIS100 as part of the FAIR-project of GSI was fabricated and tested. The obtained results are discussed. The new approach to a 'cable-in-conduit' conductor cable design, based on the use of keystoned wires, is described.
- Published
- 2005
- Full Text
- View/download PDF
39. Geometric and Magnetic Measurements of the Gantry Dipole for the HICAT Medical Accelerator
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I. Pschorn, G. Moritz, F. Klos, and M. Weipert
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Physics ,Magnetic measurements ,business.industry ,Shim (magnetism) ,Superconducting magnet ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Dipole ,Nuclear magnetic resonance ,Optics ,Magnetic core ,Dipole magnet ,Laser tracker ,Magnet ,Electrical and Electronic Engineering ,business - Abstract
Part of the HICAT medical accelerator, under construction at Heidelberg, Germany, is a huge gantry dipole. The magnet design was already reported at MT-17. This paper summarizes the main construction features. The geometric measurements are made with a laser tracker and include the determination of the iron core dimensions, the fiducialization and the alignment of the magnetic measurement equipment. Goal of the magnetic measurements was to shim the effective field boundary, to measure the integral field quality and the absolute integral field values. Dynamic field data in the central and in the fringe field are also reported.
- Published
- 2004
- Full Text
- View/download PDF
40. Design of a Superferric Dipole Magnet With High Field Quality in the Aperture
- Author
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Al Zeller, A. Kalimov, and G. Moritz
- Subjects
Physics ,Condensed matter physics ,Field (physics) ,business.industry ,Aperture ,Superconducting magnet ,Condensed Matter Physics ,Magnetic flux ,Electronic, Optical and Magnetic Materials ,Dipole ,Optics ,Dipole magnet ,Magnet ,Electrical and Electronic Engineering ,business ,Air filter - Abstract
A project to design and construct a new international accelerator was proposed by GSI (Darmstadt, Germany). This project includes the design of several new facilities. One of them is a collector ring (CR). The magnets of the CR operate at constant field (DC), but the level of this field varies for different operational tasks. The magnet system of the CR includes 24 deflecting dipole magnets. The maximum operating field in the aperture is 1.6 T, with a deflection angle of 15 degree, and a bending radius of 8.125 m. The most important requirement for this dipole is a high field uniformity (better than /spl plusmn/0.01% over a volume of 380 mm /spl times/ 150 mm). This requirement must be met for all levels of magnetic flux density in the aperture. Several magnet designs have been investigated including window frame and H-type versions with normal and superconducting coils. The best economical and technical parameters were obtained for a superferric H-type magnet with a wide air filter in the pole. The field homogeneity requirements were fulfilled in such a magnet for field range of 0.2-1.63 T. The effects of the field distortion in the end parts of the magnet, as well as influence of the end plates on the field quality, were also investigated.
- Published
- 2004
- Full Text
- View/download PDF
41. Development of Superconducting Dipole Design for Creation of Fast-Cycling Magnetic Fields
- Author
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A. I. Ageev, P. Slabodchikov, L. Tkachenko, V. Sytnik, Viktor Zubko, P. Scherbakov, S. Kozub, I. Bogdanov, G. Moritz, and J. Kaugerts
- Subjects
Physics ,Superconductivity ,Dipole ,Field (physics) ,Condensed matter physics ,Electromagnetic coil ,Dipole magnet ,Magnet ,Superconducting magnet ,Electrical and Electronic Engineering ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Magnetic field - Abstract
Short models of the UNK superconducting dipole reached a maximum central field of 6.5 T with 0.8 T/s ramp rate. It allows one to consider this magnet design as a basis for development of a superconducting dipole, which will have low heat loss and could be used for the production of fast-cycling magnetic fields, with 6T amplitude and 1 T/s ramp rate, for the new GSI synchrotron SIS-300. The dipole geometry makes it possible to independently suppress both central field and integral field low-order harmonics. The specific shape of the coil end parts enables a decrease of the maximum field in the end parts to the level in the straight part of the coil. Analyzes of magnet AC heating during the SIS-300 cycle, as well as heat transfer to the helium coolant, are presented. The magnet temperature margin and methods to increase it are discussed.
- Published
- 2004
- Full Text
- View/download PDF
42. Progress in the Design and Study of a Superferric Dipole Magnet for the GSI Fast-Pulsed Synchrotron SIS100
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M.A. Voevodin, V.G. Aksenov, Hamlet Khodzhibagiyan, G. Kuznetsov, G. Hess, I. Karpunina, C. Muehle, Alexander Kovalenko, G. Moritz, E. Fischer, and N.N. Agapov
- Subjects
Materials science ,Nuclear engineering ,Superconducting magnet ,Cryogenics ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,Magnetic field ,law.invention ,Nuclear magnetic resonance ,law ,Electromagnetic coil ,Dipole magnet ,Magnet ,Electrical and Electronic Engineering ,Yoke - Abstract
New experimental results from the investigation of a superferric window frame type dipole magnet with the operating parameters: B=2T, dB/dt=4T/s and pulse repetition rate f=1Hz are presented. The magnet SC coil is made from a hollow multifilamentary NbTi cable, cooled with two-phase helium flow. Special attention is devoted to minimization of AC power losses in the magnet to the specified value of 13W/m. The value of 9W/m has been obtained for a model magnet with the yoke at T=50K. Different possibilities were investigated to reduce the losses in the case of a cold iron yoke (T=4.5K). Other problems, connected with the magnetic field quality, mechanical and cryogenic stability of the magnet under SIS100 operating conditions are also discussed.
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- 2004
- Full Text
- View/download PDF
43. Magnets for the Heavy-Ion Cancer Therapy Accelerator Facility (HICAT) for the Clinic in Heidelberg
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B. Schlitt, A. Kalimov, F. Klos, B. Langenbeck, C. Muehle, and G. Moritz
- Subjects
Physics ,Nuclear engineering ,Transfer line ,Condensed Matter Physics ,Synchrotron ,Ion source ,Linear particle accelerator ,Electronic, Optical and Magnetic Materials ,law.invention ,law ,Magnet ,Physics::Accelerator Physics ,Heavy ion ,Electrical and Electronic Engineering ,Energy source ,Beam (structure) - Abstract
The Heavy Ion Cancer Therapy Accelerator facility (HICAT) for the university hospital in Heidelberg is now under construction and will be completed in 2006. The facility consists of 2 ion sources, low-energy beam transfer lines, a linear accelerator, a medium energy beam transfer line, a synchrotron, high-energy beam transfer lines, and 3 treatment locations. One of the treatment locations will be equipped with a gantry. All magnets were designed at GSI. The design of the magnets will be reviewed. Wherever possible, a conservative design approach was used. Special design efforts were necessary for the huge 90/spl deg/ gantry dipole and the tiny internal quadrupoles for the IH-type drift tube linac, so that prototypes of these magnets were built and tested. The design, construction, and measurements of the quadrupoles for the IH-type drift tube linac will also be discussed in detail.
- Published
- 2004
- Full Text
- View/download PDF
44. Measured and Calculated Losses in Model Dipole for GSI's Heavy Ion Synchrotron
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A.K. Ghosh, C. Muehle, Michael Anerella, G. Moritz, P. Joshi, Jesse Schmalzle, R. Soika, Joseph Muratore, J. Kaugerts, M.N. Wilson, W.V. Hassenzahl, Andrew Marone, P. Wanderer, R. Thomas, and G. Ganetis
- Subjects
Physics ,Liquid helium ,Particle accelerator ,Superconducting magnet ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Nuclear physics ,Dipole ,law ,Dipole magnet ,Magnet ,Eddy current ,Electrical and Electronic Engineering - Abstract
The new heavy ion synchrotron facility proposed by GSI will have two superconducting magnet rings in the same tunnel, with rigidities of 300 T /spl middot/ m and 100 T /spl middot/ m. Fast ramp times are needed. These can cause problems of ac loss and field distortion in the magnets. For the high-energy ring, a 1-m model dipole magnet has been built, based on the RHIC dipole design. This magnet was tested under boiling liquid helium in a vertical dewar. The quench current showed very little dependence on ramp rate. The ac losses, measured by an electrical method, were fitted to straight-line plots of loss/cycle versus ramp rate, thereby separating the eddy current and hysteresis components. These results were compared with calculated values, using parameters which had previously been measured on short samples of cable. Reasonably good agreement between theory and experiment was found, although the measured hysteresis loss is higher than expected in ramps to the highest field levels.
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- 2004
- Full Text
- View/download PDF
45. Investigation of the Power Losses in a Laminated Dipole Magnet With Superconducting Coils
- Author
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Carsten Mühle, Egbert Fischer, A. Kalimov, G. Moritz, and G. Hess
- Subjects
Physics ,Condensed matter physics ,Superconducting magnet ,Mechanics ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Magnetic field ,law.invention ,Magnetization ,Dipole ,Electromagnetic coil ,law ,Dipole magnet ,Magnet ,Eddy current ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,Nuclear Experiment - Abstract
Dynamic processes in a window-frame dipole with superconducting windings and a cold, laminated iron yoke have been investigated experimentally at JINR (Dubna, Russia), and theoretically at GSI (Darmstadt, Germany). The main aim of these investigations was a reduction of energy losses in the yoke during ramping. These losses are produced mainly by energy dissipation due to eddy currents and hysteresis effects in the laminations. Both effects were investigated theoretically. As a result, special end blocks were proposed to reduce eddy current losses. For eddy currents simulation we used a model developed at GSI and St. Petersburg State Polytechnical University (Russia). This model is based on an integro-differential approach to eddy currents in laminated structures and a volume integral method for the magnetization vector in ferromagnetic objects. To test this model, a series of experiments were performed at GSI on a normal conducting Heavy Ion Synchrotron dipole magnet. The magnetic field in the aperture of this magnet was controlled with a point coil during the current ramping in the winding. The same transient processes were simulated using software, developed on the basis of the integro-differential method. The theoretical calculations were in reasonable agreement with the measurements.
- Published
- 2004
- Full Text
- View/download PDF
46. Flower Visitors in a Natural Population of Arabidopsis thaliana
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F. Burger, M. H. Hoffmann, G. Moritz, K. Schneider, M. Bremer, and Eckart Stolle
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education.field_of_study ,Thrips ,fungi ,Population ,food and beverages ,Zoology ,Outcrossing ,Plant Science ,General Medicine ,Population biology ,Biology ,biology.organism_classification ,medicine.disease_cause ,Natural population growth ,Arabidopsis ,Pollen ,Botany ,medicine ,Arabidopsis thaliana ,education ,Ecology, Evolution, Behavior and Systematics - Abstract
Arabidopsis thaliana is commonly regarded as a self-pollinated plant species. One of the many surprises in population genetic studies of the species was the observation of distinct traces of recombination in the DNA sequences that may be the result of rare outcrossing events. We studied flower visitors in a natural population of the species. Solitary bees, diptera and thrips are among the most frequently observed insects among the surprising diversity of insects visiting flowers of A. thaliana. Assuming that every visit equals an outcrossing event, the outcrossing rate was estimated to be 0.84 %. This value falls between estimations of outcrossing rates from molecular data and those of artificial systems. Despite the rather low rate of flower visitation, A. thaliana can no longer be regarded as a completely self-pollinated plant species in the wild. This observation may explain recombination events observed in molecular analyses. Possible pollen transfer between populations due to the mobility of the observed insects should be considered in population genetic analyses.
- Published
- 2003
- Full Text
- View/download PDF
47. Inter-strand resistance measurements in cored Nb-Ti Rutherford cables
- Author
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W.V. Hassenzahl, Michael Anerella, A.K. Ghosh, P. Wanderer, G. Moritz, J. Kaugerts, M.N. Wilson, and R. Soika
- Subjects
Superconductivity ,Rutherford cable ,Materials science ,Contact resistance ,Niobium ,chemistry.chemical_element ,Superconducting magnet ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Nuclear magnetic resonance ,chemistry ,law ,Electrical resistivity and conductivity ,Electrical and Electronic Engineering ,Atomic physics ,Relativistic Heavy Ion Collider - Abstract
Cored Nb-Ti Rutherford cables with high crossover resistance R/sub c/ are being investigated to minimize ac losses in a set of superconducting dipole magnets for the proposed rapid cycling heavy ion synchrotron facility at the Gesellschaft fur Schwerionenforschung (GSI) in Darmstadt, Germany. This ring of magnets is based on the Relativistic Heavy Ion Collider (RHIC) design. R/sub c/ in cored cables is significantly larger than the contact resistance between adjacent strands R/sub a/. The latter, however, dominates the voltage profile when the interstrand contact resistance is measured via the usual VI technique. This makes the extraction of the magnitude of R/sub c/ out of the voltage profile very difficult. Knowledge of R/sub c/ is important to predict ac losses, because if R/sub c/ and R/sub a/ were equal, perpendicular field induced losses due to R/sub c/ would be around 50 times greater than those induced by R/sub a/. Because of the importance of the crossover resistance, we have developed a novel measurement technique for R/sub c/ in cored Nb-Ti Rutherford cables. The procedure involves removing the edges of the conductors along the region to be measured. We have measured the cables using the new technique and the usual VI technique. We describe the novel measurement technique and present results for cables made with different core materials. While measuring R/sub c/, we found evidence that R/sub a/ is nonuniform over the length of a twist pitch and is in fact significantly lower at the cable edge. We report on this as well.
- Published
- 2003
- Full Text
- View/download PDF
48. Superferric magnets for the proposed international accelerator facility at GSI
- Author
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J.C. DeKamp, G. Moritz, C. Mühle, B. Langenbeck, Al Zeller, and M. Winkler
- Subjects
Physics ,Nuclear engineering ,Large aperture ,Superconducting magnet ,Experimental Devices ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Field uniformity ,Magnetic field ,Nuclear physics ,Magnet ,Physics::Accelerator Physics ,Static field ,Electrical and Electronic Engineering ,Storage ring - Abstract
The proposed International Accelerator Facility at Gesellschaft fur Schwerionenforschung (GSI) has several new experimental devices that may require superconducting magnets to provide the required magnetic fields. Superferric magnets have been designed that allow the production of the required high gradients in the large aperture quadrupoles and also allow the insertion of sextupole and octupole inserts. Dipoles have been designed that fulfill the field uniformity and radiation resistance requirements. Most of the magnets are static field, but the New Experimental Storage Ring (NESR) needs magnets that ramp at 1 T/s. Solutions are presented that use warm iron to reduce losses.
- Published
- 2003
- Full Text
- View/download PDF
49. Design of new hollow superconducting NbTi cables for fast cycling synchrotron magnets
- Author
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Hamlet Khodzhibagiyan, V. Drobin, S.A. Averichev, G. Moritz, N.M. Vladimirova, A. Starikov, Egbert Fischer, Alexander Kovalenko, V. Alexeev, G.P. Vedernikov, L.V. Potanina, Alexander Smirnov, and A. K. Shikov
- Subjects
Superconductivity ,Materials science ,Nuclear engineering ,Synchrotron radiation ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Cross section (physics) ,Nuclear magnetic resonance ,law ,Magnet ,Tube (fluid conveyance) ,Electrical and Electronic Engineering ,Current density ,Type-II superconductor - Abstract
Two new options for a hollow NbTi superconducting cable were considered. The first one is based on keystoned wires wrapped around a copper-nickel tube 5 mm in diameter. The second one is a hollow cable of rectangular cross section. The data from cable short sample tests are presented. Some problems with the production technology are discussed. This work is part of the R&D for the Future Accelerator Facility, at GSI in Darmstadt.
- Published
- 2003
- Full Text
- View/download PDF
50. Superconducting magnets for the 'international accelerator facility for beams of ions and antiprotons' at GSI
- Author
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G. Moritz
- Subjects
Physics ,Synchrotron radiation ,Superconducting magnet ,Condensed Matter Physics ,Synchrotron ,Electronic, Optical and Magnetic Materials ,law.invention ,Magnetic field ,Nuclear physics ,Dipole ,Rigidity (electromagnetism) ,law ,Magnet ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,Nuclear Experiment ,Storage ring - Abstract
The concept for GSI's planned future facility is based on two superconducting synchrotrons, SIS 100 and SIS 200. The two accelerators are in the same tunnel and have the same radius R, for operation at BR=100 Tm and 200 Tm respectively. Superconducting magnets are necessary to reach the appropriate magnetic field and may considerably reduce the investment and operating costs, in comparison with conventional magnets. An R&D program was initiated to develop dipole magnets with maximum fields of 2 and 4 Tesla and dipole ramp rates of 4 T/s and 1 T/s, respectively. These requirements were chosen to achieve high average beam intensities. The SIS 100 dipole is a window-frame Nuclotron-type dipole and is being developed in collaboration with JINR (Dubna, Russia). This magnet has been operated at 4 T/s up to a field of 2 Tesla. Reduced losses and improved magnetic field quality are required for the SIS 100 accelerator. In a separate collaboration with BNL (Upton, USA), the one coil layer cos/spl theta/-type RHIC arc dipole, originally designed for operation at 3.5 Tesla with a rather slow ramp rate of 0.042 T/s, will be upgraded for the SIS 200 accelerator to operate at a ramp rate of 1T/s, up to a field of 4 T. R&D for a 6 Tesla dipole was started in collaboration with IHEP (Protvino, Russia), to further increase the rigidity of the SIS 200 ring to 300 Tm. Alternative schemes have been investigated. Besides the synchrotrons, the planned facility will consist of several storage rings and the Super Fragment Separator (SFRS), which have mainly DC magnets with large apertures. NSCL (East Lansing, USA) prepared a feasibility study for these superconducting magnets. The main results of the R&D are presented.
- Published
- 2003
- Full Text
- View/download PDF
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