298 results on '"Cryomodule"'
Search Results
2. Demagnetization of a complete superconducting radiofrequency cryomodule: Theory and practice
- Author
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Chandrasekaran, Saravan [Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)]
- Published
- 2016
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Catalog
3. PREPARATIONS FOR ASSEMBLY OF THE INTERNATIONAL ERL CRYOMODULE AT DARESBURY LABORATORY
- Author
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Smith, T
- Published
- 2009
4. Composite Vibration Isolation Support Structures with Low Thermal Conductivity
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Fernandez, Francisco [Composite Technology Development, Inc., Lafayette, CO (United States)]
- Published
- 2016
5. Development of a cryomodule for the CEBAF upgrade
- Published
- 1999
6. Cryomodule development for the CEBAF upgrade
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Wiseman, M
- Published
- 1999
7. PREPARATIONS FOR ASSEMBLY OF THE INTERNATIONAL ERL CRYOMODULE AT DARESBURY LABORATORY
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McIntosh, P. A.
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Plasma physics and fusion ,cryomodule - Abstract
The collaborative development of an optimised cavity/cryomodule solution for application on ERL facilities has now progressed to final assembly and testing of the cavity string components and their subsequent cryomodule integration. This paper outlines the verification of the various cryomodule sub-components and details the processes utilised for final cavity string integration. The paper also describes the modifications needed to facilitate this new cryomodule installation and ultimate operation on the ALICE facility at Daresbury Laboratory. more...
- Published
- 2009
8. Performance of the FEL cryomodules
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Preble, J
- Published
- 1998
9. Status of the Series Fabrication of the Superconducting Magnet Packages for LIPAc Cryomodule
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Ivan Podadera, Francisco Gabriel Acién Fernández, Joaquin Munilla, Julio Lucas, Raul Ben-Smida, Luis Miguel Martinez, J. Calero, Antonio Estevez, Joaquin Molla, P. Abramian, Fernando Toral, Michel Lopez, Pablo Gomez, and Marcos Garcia more...
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Fabrication ,Materials science ,Nuclear engineering ,Beam steering ,Solenoid ,Superconducting magnet ,Condensed Matter Physics ,01 natural sciences ,Linear particle accelerator ,Electronic, Optical and Magnetic Materials ,Magnet ,Cryomodule ,0103 physical sciences ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,010306 general physics ,Beam (structure) - Abstract
The last acceleration stage of the deuteron beam of the LIPAc linear accelerator is provided by eight superconducting cavities in a cryomodule (SRF Linac). Each cavity needs a magnet package, which consists of a solenoid for beam focusing and two vertical and horizontal dipole correctors for beam steering. The superconducting coils are fed by vapour cooled current leads. The beam position monitor is part of the magnet helium vessel. The series fabrication of eight sets of magnets and current leads has been performed by Elytt Energy, under CIEMAT follow-up. This paper describes the final design used for production, the main challenges addressed during fabrication, together with the quality control procedure, acceptance tests and qualification criteria to validate both the magnets and current leads. Currently some activities are being performed in the magnet helium vessels for improvement of surfaces for handling inside the clean room and reducing the risk of presence of particulate contaminations in the beam tube. more...
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- 2021
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10. Vibration of a cryomodule’s coupler during road transportation: Multibody analysis and experimental validation
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Andrea Barnaba, Mattia Parise, Paolo Neri, Francesco Bucchi, and Donato Passarelli
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reduced order methods ,Computer science ,Aerospace Engineering ,02 engineering and technology ,road transportation ,01 natural sciences ,Experimental data analysis ,vibration measurement ,Automotive engineering ,Task (project management) ,0203 mechanical engineering ,experimental data analysis ,couplers ,finite element analysis modelling ,0103 physical sciences ,Vibration measurement ,General Materials Science ,010308 nuclear & particles physics ,Mechanical Engineering ,Experimental validation ,Vibration ,020303 mechanical engineering & transports ,Mechanics of Materials ,Cryomodule ,Automotive Engineering - Abstract
The road transportation of critical components for cryogenic cryomodules is a challenging task. Indeed, the shipping and the handling of fundamental sub-assemblies can expose these components to harmful dynamic loads that can jeopardize their structural integrity. This article has the purpose of developing a finite element multibody model capable of assessing the acceleration on a test coupler for a cavity of the Single Spoke Resonator 1 subjected to a typical road transportation trip. A multibody model consisting of rigid bodies and finite element–imported flexible bodies has been created allowing a comparison of the simulated and experimental acceleration. Afterwards, an experimental on-road test, whose set-up is described in this article, has been carried out at Fermilab with instrumented components. Being able to effectively simulate and validate the dynamic effects on such sub-assemblies makes it possible, for the future, to simulate more complex structures subject to dynamic loadings, such as the entire cryomodules during shipping. Furthermore, the results from the simulations can be used to guide the design of new suspension systems suitable for the reduction mitigation of structural vibration during the road transportation of cryomodules. more...
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- 2021
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11. Upgrade Plan of the KOMAC Proton Linac for the Atmospheric Radiation Test on Semiconductor Devices
- Author
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Kim, Han-Sung, Kwon, Hyeok-Jung, Lee, Seung-Hyun, Dang, Jeong-Jeung, Lee, Pilsoo, Yoon, Sang-Pil, and Cho, Yong-Sub
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- 2020
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12. Design Optimization of a Mechanically Improved 499.8-MHz Single-Cell Superconducting Cavity for HEPS
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Ma Changcheng, Qiang Ma, Ruixiong Han, Weimin Pan, Rui Ge, Xinying Zhang, Tong-Ming Huang, Zhenghui Mi, Hongjuan Zheng, Pei Zhang, and Zhongquan Li
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Materials science ,business.industry ,Physics::Optics ,Synchrotron light source ,Condensed Matter Physics ,01 natural sciences ,Pressure vessel ,Electronic, Optical and Magnetic Materials ,Cryomodule ,0103 physical sciences ,Microphonics ,Physics::Accelerator Physics ,Optoelectronics ,Radio frequency ,Electrical and Electronic Engineering ,010306 general physics ,business ,Cavity wall ,Beam (structure) ,Voltage - Abstract
Superconducting 499.8-MHz radio frequency (rf) cavities have been proposed for the High Energy Photon Source (HEPS), a 6-GeV diffraction-limited synchrotron light source currently under construction in Beijing. Being an active third-harmonic system, two cavities shall provide 3.5-MV rf voltage and 400 kW of beam power to enable a complex rf gymnastics required by a novel injection scheme. Adopting the veteran KEKB-type 500-MHz single-cell geometry, the cavity design has been focused on optimizing its mechanical properties. Various cavity wall thickness and external stiffening mechanisms were investigated to reinforce the cavity to ensure compliance to the pressure vessel codes under different working conditions from a bare cavity to a dressed cavity in the cryomodule. Small margins on operational pressure previously reported on this type of cavity have been largely improved with slightly reduced yet acceptable frequency tunability. Extensive design optimizations have been conducted aiming for lower stress, larger elastic buckling pressure, and higher frequencies of mechanical modes to cause microphonics, while the frequency tunability, pressure sensitivity, and Lorentz force detuning were being carefully monitored. In view of the HEPS’s lifetime, cavity fatigue was examined. This constitutes a comprehensive design optimization of the 499.8-MHz single-cell superconducting cavity with improved mechanical properties. more...
- Published
- 2021
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13. Cryogenic System for Linear IFMIF Prototype Accelerator Superconducting Cryomodule
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Kondo Keitaro, Ebisawa Takashi, Renard Bertrand, Komata Masao, and Kasugai Atsushi
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Superconductivity ,Materials science ,Cryogenic system ,Cryomodule ,Nuclear engineering - Published
- 2021
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14. Performance of Superconducting Magnet Prototypes for LCLS-II Linear Accelerator.
- Author
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Kashikhin, Vladimir, Andreev, Nikolai, DiMarco, Joseph, Makarov, Alexander, Tartaglia, Michael, and Velev, George
- Subjects
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SUPERCONDUCTING magnets , *LINEAR accelerators , *QUADRUPOLES , *MAGNETIC hysteresis , *RADIO frequency , *EQUIPMENT & supplies , *PROTOTYPES , *MAGNETIC field measurements - Abstract
The new LCLS-II Linear Superconducting Accelerator at SLAC needs superconducting magnet packages installed inside SCRF (superconducting radio frequency technology) cryomodules to focus and steer an electron beam. Two magnet prototypes were built and successfully tested at Fermilab. Magnets have an iron-dominated configuration, quadrupole and dipole NbTi superconducting coils, and splittable in the vertical plane configuration. Magnets inside the cryomodule are conductively cooled through pure Al heat sinks. Both magnets’ performance was verified by magnetic measurements at room temperature, and during cold tests in liquid helium. Test results including magnetic measurements are discussed. Special attention was given to the magnet performance at low currents where the iron yoke and the superconductor hysteresis effects have large influence. Both magnet prototypes were accepted for the installation in FNAL and JLAB prototype cryomodules [ABSTRACT FROM PUBLISHER] more...
- Published
- 2017
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15. Demagnetization of a Complete Superconducting Radiofrequency Cryomodule: Theory and Practice.
- Author
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Chandrasekaran, Saravan K. and Crawford, Anthony C.
- Subjects
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SUPERCONDUCTORS , *RADIO frequency , *DEMAGNETIZATION , *MAGNETIC fields , *MAGNETIC flux density - Abstract
A significant advance in magnetic field management in a fully assembled superconducting radiofrequency cryomodule has been achieved and is reported here. Demagnetization of the entire cryomodule after assembly is a crucial step toward the goal of average magnetic flux density less than 0.5 μT at the location of the superconducting radio frequency cavities. An explanation of the physics of demagnetization and experimental results are presented. [ABSTRACT FROM PUBLISHER] more...
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- 2017
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16. Design of Stand-Alone Cryomodule Based on Superconducting Quarter-Wave Resonator
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M.P. Kelly, Ronald Agustsson, R. L. Fischer, K. Taletski, Robert Berry, Z.A.Conway, and Sergey Kutsaev
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Computer science ,Semiconductor device fabrication ,Liquid helium ,Nuclear engineering ,Refrigeration ,Cryocooler ,Condensed Matter Physics ,01 natural sciences ,Linear particle accelerator ,Electronic, Optical and Magnetic Materials ,law.invention ,Resonator ,Upgrade ,law ,Cryomodule ,0103 physical sciences ,Electrical and Electronic Engineering ,010306 general physics - Abstract
Present superconducting accelerators require a central refrigeration system and piping to distribute liquid helium and nitrogen. Stand-alone cryocooler-based systems are of significant interest both to scientific and industrial customers, as they allow applications at facilities where no cryogenic equipment and expertise exists, where it is undesirable to develop additional cryogenic systems, or where a mobile system that can be transported between beamlines or facilities is required. The technical challenge of this approach is to minimize the heat losses to the liquid helium so that commercially available, self-contained cryocoolers are able to handle the thermal load. This article presents an improved design for a stand-alone quarter-wave resonator (QWR) cryomodule based on commercially available cryocoolers. This cryomodule has a particular application in the Argonne Tandem Linac Accelerator System intensity upgrade project, where it will house a 72.75 MHz QWR for beam energy adjustments to experimental areas, where no helium cryogenic systems exist. The described cryomodule may also be the critical part of a turnkey system with application to material processing, semiconductor manufacturing, food irradiation, and homeland security. The development of low-heat loss peripheral components reduces the cost and widens applicability of the system. We will discuss the cryomodule and RF coupler designs, including numerical thermal and structural analyses. more...
- Published
- 2020
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17. Design and Mechanical Performance of a Dressed 166.6 MHz $\beta$=1 Proof-of-Principle Superconducting Cavity in Horizontal Tests
- Author
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Qun-Yao Wang, Ruixiong Han, Dongbing Li, Zhenghui Mi, L. T. Sun, Pei Zhang, Xinying Zhang, Rui Ge, Weimin Pan, Haiying Lin, Qiang Ma, Zhongquan Li, Jin Dai, Tong-Ming Huang, and Fanbo Meng
- Subjects
Materials science ,business.industry ,Niobium ,chemistry.chemical_element ,Synchrotron light source ,Condensed Matter Physics ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,symbols.namesake ,Optics ,chemistry ,Cryomodule ,0103 physical sciences ,Microphonics ,symbols ,Physics::Accelerator Physics ,Thermal emittance ,Electrical and Electronic Engineering ,010306 general physics ,business ,Lorentz force ,Storage ring ,Helium - Abstract
Superconducting β=1 quarter-wave geometry of 166.6 MHz has been proposed as main accelerating cavities for the high-energy photon source (HEPS) storage ring. HEPS is a 6-GeV kilometer-scale synchrotron light source promising ultralow emittance currently being constructed in Beijing. A proof-of-principle cavity has been previously in-house developed and vertical-tested achieving excellent cryogenic performances. A helium jacket was subsequently designed adopting a simple structure and an integrated magnetic field shielding. The mechanical properties of the dressed cavity were largely improved focusing on pressure sensitivity, stress, and Lorentz force detuning, while frequency tunability and microphonics were carefully monitored. Elastic buckling and fatigue were also examined. The helium jacket was later fabricated and welded directly with the niobium cavity. Mounted with an input power coupler and tuners, the dressed cavity was finally assembled in a modified cryomodule and tested at both 4.2 and 2.0 K. The favored low-pressure sensitivity and small Lorentz force detuning were confirmed. Microphonics spectrum was scanned and measured, presenting good consistencies with simulation predictions. Finally, the cavity was successfully tuned to the operating frequency of 166.6 MHz at cold and its frequency could be regulated within a ±3-Hz range. This article covers the mechanical aspects in the development and horizontal cryogenic tests of the first dressed 166.6-MHz superconducting cavity. more...
- Published
- 2020
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18. Commissioning Status of the Linac for the Facility for Rare Isotope Beams
- Author
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Haitao Ren, I. Nesterenko, D. Omitto, P. Morrison, Scott Cogan, Peter Ostroumov, F. Pellemoine, T. Larter, J. Brandon, Fabio Casagrande, D. Chabot, Yoshishige Yamazaki, Paul Gibson, Z. Li, T. Maruta, H. Maniar, Ian Grender, Kent Holland, Chris Compton, Daniel H. Morris, A. Stolz, I. Malloch, Kenji Saito, G. Kiupel, Mengxin Xu, Qiang Zhao, Steven Lidia, Ting Xu, Sang-Hoon Kim, S. Rodriguez, B. Barnes, Martin Konrad, T. Yashimoto, H. Ao, Evan Daykin, Laura Popielarski, G. Bollen, C. Morton, R. Bennett, Guillaume Machicoane, P. Manwiller, Rebecca Shane, Kelly Davidson, D. Georgiobani, E. Bernal-Ruiz, P. Rodriguez, Thomas Russo, Alexander Plastun, Leslie Hodges, E. Pozdeyev, Masanori Ikegami, John Popielarski, J. Wei, Nathan Bultman, G. Timko, M. Hausmann, Walter Hartung, Aftab Hussain, Shen Zhao, B. Martins, S. Stanley, and B. Bull more...
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010302 applied physics ,Physics::Instrumentation and Detectors ,Project commissioning ,Nuclear engineering ,Astrophysics::Instrumentation and Methods for Astrophysics ,General Physics and Astronomy ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Linear particle accelerator ,Distribution system ,Front and back ends ,Cryogenic nitrogen plant ,Cryomodule ,0103 physical sciences ,Physics::Accelerator Physics ,Environmental science ,Heavy ion ,0210 nano-technology - Abstract
The Facility for Rare Isotope Beams will be completed in late 2021. We report here on the current efforts to commission the first stages of the 200-MeV/u superconducting, continuous wave heavy-ion linac. The statuses of the cryogenic plant and its distribution system, the accelerator cryomodule commissioning and operations, the ion source and front end transport development, the radio-frequency quadrupole commissioning, and thenbeam dynamics development to support high-power operation are reviewed. Plans for commissioning the remainder of the linac systems are presented. more...
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- 2020
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19. Upgrade Plan of the KOMAC Proton Linac for the Atmospheric Radiation Test on Semiconductor Devices
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Hyeok-Jung Kwon, Seung-Hyun Lee, P. Lee, Yong-Sub Cho, Han-Sung Kim, Jeong-Jeung Dang, and Sang-Pil Yoon
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010302 applied physics ,Physics ,Nuclear engineering ,Nuclear Theory ,General Physics and Astronomy ,02 engineering and technology ,Semiconductor device ,021001 nanoscience & nanotechnology ,01 natural sciences ,Neutron temperature ,Linear particle accelerator ,law.invention ,Upgrade ,Soft error ,law ,Cryomodule ,0103 physical sciences ,Physics::Accelerator Physics ,Neutron ,Beam dump ,Nuclear Experiment ,0210 nano-technology - Abstract
At the Korea Multi-purpose Accelerator Complex (KOMAC), a 100-MeV high-power proton linac has been used for proton-beam irradiation services for various applications and research programs, including material science, bio-medical science, semiconductor applications, as well as nuclear physics and basic science, since commissioning of the machine in 2013. Recently, demands for fast neutrons from users in the semiconductor industries are increasing to test the semiconductor device SER (soft error rate) or SEE (single event effect). At present, we provide pilot services to users with pulsed white-spectrum neutrons (max. neutron energy ∼100 MeV) generated at the beam dump, which is made of copper. However, the neutron energy should be increased at least to 200 MeV to meet international standards such as ISO26262 or JEDEC89A. For the upgrade of the linac energy to 200 MeV, we conducted a preliminary design study, including superconducting radio-frequency (SRF) based linac structure, a neutron generation target and a neutron utilization facility. The upgrade plan for the KOMAC linac, along with the preliminary results of the design study on the superconducting linac and neutron generation facility, will be given in this paper. more...
- Published
- 2020
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20. Measurement of RF characteristics for Superconducting Quarter-wave Resonator
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Pei Zhang, JongChul Lee, Mitra Ghergherehchi, Yacine Kadi, and Jong-Seo Chai
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010302 applied physics ,Coupling ,Materials science ,business.industry ,System of measurement ,RF power amplifier ,General Physics and Astronomy ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Resonator ,Optics ,Cryomodule ,Electric field ,0103 physical sciences ,Measurement uncertainty ,0210 nano-technology ,business ,Coupling coefficient of resonators - Abstract
RF characteristics of unloaded quality factor (Q0) and accelerating electric field (Eacc) were measured for superconducting quarter-wave resonator (QWR) in order to verify the performance. For the accurate measurement of RF characteristics, the measurement method of Q0 based RF power and RF coupling coefficient was used, and the measurement uncertainty was calculated with statistics analysis of systematic error in RF measurement system. The superconducting QWR was designed with a resonant frequency of 101.28 MHz and an accelerating electric field (Eacc) of 6 MV/m at a cavity dissipation power of 10 W in the high-intensity and energy isotope separator online device (HIE-ISOLDE) project at CERN. Q-slopes and RF coupling coefficients were measured for three QWRs at the resonant frequency 101.28 MHz. Q0 values of QWRs were measured 4.55 × 108, 3.78 × 108 and 3.17 × 108 at the 6 MV/m, respectively, and the measurement uncertainty of Q0 and Eacc were calculated 2.92% and 3.32%. Performances of superconducting QWRs were acceptable to operate the beam acceleration with consideration of cryomodule capacity in HIEISOLDE project. more...
- Published
- 2020
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21. Advanced cryogenic process control and monitoring for the SPIRAL2 superconducting LINAC
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Ghribi, Adnan, Aburas, Muhammad, Bernaudin, Pierre-Emmanuel, Bonnay, Patrick, Bonne, François, Corbel, Antoine, Di-Giacomo, Marco, Millet, François, Tsafak, Auriol Ngueguim, Trudel, Arnaud, Tura, Quentin, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département des Systèmes Basses Températures (DSBT ), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Graal, and ANR-09-JCJC-0036,SPIRAL(2009) more...
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Accelerator Physics (physics.acc-ph) ,Technology ,[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] ,FOS: Physical sciences ,cavity ,Accelerator Physics ,cryomodule ,cryogenics ,Physics - Data Analysis, Statistics and Probability ,controls ,Physics - Accelerator Physics ,linac ,[PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an] ,Data Analysis, Statistics and Probability (physics.data-an) - Abstract
SPIRAL2 is a superconducting accelerator for protons, deuterons and heavy ions delivering a maximum beam power of 200 kW at 40 MeV (for deuteron beams). 26 superconducting quarter wave cavities are operated at 4.4 K, plunged in a liquid helium bath with a drastic phase separator pressure control. Previous years have seen the development of advanced process control for cryogenics allowing to cope with high heat load dynamics thanks to an automatic heat dissipation compensation and a model based control. The latter is based on models, using the Simcryogenics library, optimized and linearised in the Programmable Logic Controllers. The SPIRAL2 operation has demonstrated that such control allows to keep the specified conditions for RF and beam operation even at levels of heat load dissipation approaching the physical limits of the cryogenic system. These developments allowed to synthesise a virtual observer of the dynamic heat load dissipated by the cavities. The present paper summarises the development of such observer based on the physical thermodynamic model and on machine learning techniques., Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK more...
- Published
- 2022
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22. FLASH2020+ Upgrade - Modification of RF Power Waveguide Distribution for the Free-electron Laser FLASH at DESY
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Yildirim, Burcu, Choroba, Stefan, Katalev, Valery, Morozov, Petr, Nachtigal, Yasmin, and Vladimirov, Nikolay
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FEL ,cryomodule ,klystron ,GUI ,Electron Accelerators and Applications ,cavity ,Accelerator Physics - Abstract
Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK, 28 Aug 2022 - 2 Sep 2022; [Geneva] : JACoW Publishing, Geneva, Switzerland 747-749 (2022). doi:10.18429/JACoW-LINAC2022-THPOPA01, The goal of FLASH2020+ upgrade is to increase the energy of the FLASH accelerator, which allows the use of even shorter wavelengths, which, in turn, will allow new research. For this purpose, during the shutdown in 2022, two superconducting accelerator modules for ACC2 and ACC3 will be replaced by new ones. To fully realize the potential of these cryomodules XFEL type of waveguide distributions will be installed on them. In addition, the existing ACC4 and ACC5 cryomodules will also be equipped with the new waveguide distributions, similar XFEL type. These waveguide distributions will be modified and improved so that the machine can operate with the maximum energy due to individual power supply for each cavity. Furthermore, three RF stations will receive a new klystron waveguide distribution, which will improve the reliability of all systems. The specific waveguide distributions have been developed, produced and tested at the Waveguide Assembly and Test Facility (WATF) at DESY. All together will lead to increasing the electron beam energy from 1.25 to 1.35 GeV. This paper presents data on the production and tuning of waveguide distribution systems for the FLASH2020+ upgrade at DESY., Published by JACoW Publishing, Geneva, Switzerland, [Geneva] more...
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- 2022
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23. RF Measurement and Characterization of European Spallation Source Cavities at UKRI-STFC Daresbury Laboratory and DESY
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Smith, Paul, Akintola, Ayomikun, Dumbell, Keith, Ellis, Mike, Hitchen, Sean, Hornickel, Philip, Jenkins, Conor, Jones, Geraint, Lowe, Mike, Mason, David, May, Andrew, McIntosh, Peter, Middleman, Keith, Miller, George, Moss, Andrew, Mutch, Jenifer, Oates, Adrian, Pattalwar, Shrikant, Pendleton, Mark, Poynton, John, Reschke, Detlef, Steder, Lea, Wheelhouse, Alan, Wiencek, Mateusz, Wilde, Stuart, and Wilson, James more...
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radiation ,detector ,cryomodule ,MMI ,cavity ,Proton and Ion Accelerators and Applications ,Accelerator Physics - Abstract
Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK 31st Linear Accelerator Conference, LINAC2022, Liverpool, United Kingdom, 28 Aug 2022 - 2 Sep 2022; [Geneva] : JACoW Publishing, Geneva, Switzerland 212-214 (2022). doi:10.18429/JACoW-LINAC2022-MOPOGE25, The Accelerator and Science and Technology Centre (ASTeC) is responsible for delivering 88 High Beta (HB) cavities as part of the European Spallation Source (ESS) facility in Sweden. The bulk Niobium Superconducting Radio Frequency (SRF) cavities operate at 704 MHz. They have been fabricated in industry and are currently being tested at Daresbury Laboratory and Deutsches Elektronen-Synchrotron (DESY). They will then be delivered to Commissariat à l’énergie atomique et aux énergies alternatives (CEA) Saclay, France for integration into cryomodules. To date, 50 cavities have been conditioned and evaluated and 36 cavities have been delivered to CEA. This paper discusses the experiences and testing of the cavities performed to date at both sites., Published by JACoW Publishing, Geneva, Switzerland, [Geneva] more...
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- 2022
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24. LCLS-II-HE Cryomodule Production Status at Fermilab
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Damon J. Bice, Charles Grimm, James Blowers, Thomas H. Nicol, Martina Martinello, Joshua Kaluzny, Brian Hartsell, T. Arkan, Mattia Checchin, and Sam Posen
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Cryomodule ,Nuclear engineering ,Environmental science ,Fermilab - Published
- 2021
- Full Text
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25. Superconducting Magnet Performance for the LCLS-II Project
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M. Tartaglia, Joseph DiMarco, A. Makarov, Oliver Kiemschies, D.F. Orris, Vladimir Kashikhin, and Thomas Strauss
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Materials science ,Liquid helium ,Mechanical engineering ,Superconducting magnet ,Condensed Matter Physics ,Linear particle accelerator ,Electronic, Optical and Magnetic Materials ,law.invention ,Electromagnetic coil ,law ,Magnet ,Cryomodule ,Physics::Accelerator Physics ,Fermilab ,Electrical and Electronic Engineering ,Magnetic levitation - Abstract
The new LCLS-II Superconducting Linear Accelerator Cryomodules are under construction at Fermilab. Installed inside each Super Conducting Radio Frequency (SCRF) Cryomodule is a superconducting magnet package to focus and steer an electron beam. The iron-dominated magnet package has conductively cooled racetrack-type coils with both quadrupole and dipole windings. For ease of installation, the magnet is splittable in the vertical plane. To confirm magnet specifications, we performed a quality acceptance in a liquid helium bath for quench testing, and we performed high-precision magnetic field measurements. The magnetic and mechanical center alignment was investigated using the vibrating wire technique. Several prototypes and all production units have been tested. This paper summarizes the magnetic measurements and quench test results of all tested units, including comparison of performance and repeatability between different units. more...
- Published
- 2019
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26. Radio Frequency Processing of Radio Frequency Power Coupler for Quarter Wave Resonator in Rare Isotope Science Project
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Bonghyuk Choi, Yoochul Jung, Sangbeen Lee, and Junwoo Lee
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010302 applied physics ,Test bench ,Materials science ,business.industry ,RF power amplifier ,General Physics and Astronomy ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Radio frequency power transmission ,Power (physics) ,Resonator ,Cryomodule ,0103 physical sciences ,Optoelectronics ,Radio frequency ,Pulse mode ,0210 nano-technology ,business - Abstract
Radio frequency (RF) power couplers for quarter wave resonators (QWR) have been developed for rare isotope science project (RISP) in Daejeon Korea. The power coupler is required to deliver up to 2 kW RF power at 81.25 MHz to the QWR cavity in continuous-wave (CW) mode. The prototype of QWR RF power couplers are fabricated and tested. The coupler test bench has been developed in order to conduct RF processing. The RF processing consists of two section, pulse mode and CW mode. The multipaction (MP) band of the QWR coupler has been measured during RF processing. After the RF processing, the RF test has been performed keeping 2.0 kW RF power during 8 hours. As the results of the RF test, the prototype of couplers for QWR has been qualified to assemble with the cavity for cryomodule test. more...
- Published
- 2019
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27. Advances in Multiphysics Modeling for Parallel Finite-Element Code Suite ACE3P
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Lixin Ge, Liling Xiao, Cho-Kuen Ng, and Zenghai Li
- Subjects
Computer science ,Multiphysics ,Particle accelerator ,Solver ,Linear particle accelerator ,law.invention ,Computational science ,law ,Cryomodule ,Parallel programming model ,Physics::Accelerator Physics ,General Earth and Planetary Sciences ,Computational electromagnetics ,Massively parallel ,General Environmental Science - Abstract
Developed by SLAC, the advanced computational electromagnetics three-dimensional parallel (ACE3P) code suite is a comprehensive set of parallel finite-element codes for multiphysics modeling of particle accelerators. Running on massively parallel computer platforms for high fidelity and high accuracy simulation, ACE3P enables rapid virtual prototyping of accelerator and radio frequency (RF) component design, optimization, and analysis. Recent advances of ACE3P have been focused on the implementation of advanced numerical algorithms, enhancement of multiphysics capabilities, and integration of ACE3P with other particle beams and plasmas codes toward end-to-end simulations in accelerators, and improvement of code performance on the state-of-the-art high-performance computing (HPC) platforms for large-scale RF modeling in accelerator applications and beyond. In this article, we will present a nonlinear electromagnetic (EM) eigensolver for damping calculation of resonant modes for cavities coupled with waveguides, the thermal solver for accurate evaluation of heat loads in superconducting RF (SRF) cavity power coupler, the elastic solver for investigation of SRF cavity cryomodule (CM) bowing due to thermal effect, the frequency-domain mechanical solver for studying SRF cavity mechanical oscillation modes, the particle tracking code for dark current simulation in SRF CM using a hybrid MPI+OpenMP parallel programming model, and the time-domain solver for high-fidelity modeling of EM wave propagation for powering midfield medical devices in human body. All the simulations have been performed on the computing resources at the National Energy Research Scientific Computing Center, and the impact of HPC on multiphysics modeling will be discussed. more...
- Published
- 2019
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28. Transportation Analysis of the Fermilab High-Beta 650 MHz Cryomodule
- Author
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Helsper, Josh, Cheban, Sergey, and Salehinia, Iman
- Subjects
Nuclear physics ,Physics ,Cryomodule ,Beta (velocity) ,Fermilab ,SRF Technology ,Accelerator Physics - Abstract
The prototype High-Beta 650 MHz cryomodule for the PIP-II project will be the first of its kind to be transported internationally, and the round trip from FNAL to STFC UKRI will use a combination of road and air transit. Transportation of an assembled cryomodule poses a significant technical challenge, as excitation can generate high stresses and cyclic loading. To accurately assess the behavior of the cryomodule, Finite Element Analysis (FEA) was used to analyze all major components. First, all individual components were studied. For the critical/complex components, the analysis was in fine detail. Afterwards, all models were brought to a simplified state (necessary for computational expenses), verified to have the same behavior as their detailed counterparts, and combined to form larger sub-assemblies, with the ultimate analysis including the full cryomodule. We report the criteria for acceptance and methods of analysis, and results for selected components and sub-assemblies., Proceedings of the 20th International Conference on RF Superconductivity, SRF2021, East Lansing, MI, USA more...
- Published
- 2021
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29. Experimental validation of the Finite Element-Multibody model of a cryomodule during road transportation
- Author
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Francesco Bucchi, Paolo Neri, and Donato Passarelli
- Subjects
Computer science ,business.industry ,Cryomodule ,Structural engineering ,Experimental validation ,business ,Finite element method - Abstract
The present activity aims to test the Transportation Tooling (TT) designed for the Cryomodule SSR1 at Fermilab facilities. The tests consisted of road transportation trials of a cryomodule sub-assembly, suspended on a truck using the designed TT. The truck drove along a path inside Fermilab facilities. The trial was performed at an approximate speed of about 25 km/h, which is close to the transportation conditions of the complete Cryomodule. Several accelerometers were mounted on the Transportation Tooling frame and the cryomodule sub-assembly. This allowed comparing the vibration behavior of the inner frame of the TT with the solicitation coming from the truck loading bed, to assess the filtering capabilities of the tooling. Also, the acceleration of the main components could be monitored during the whole transportation, to obtain a validation of the developed numerical model. more...
- Published
- 2021
30. Experimental modal analysis of SSR1 cryomodule for numerical model tuning and validation
- Author
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Paolo Neri, Donato Passarelli, A. Barnaba, and Francesco Bucchi
- Subjects
Model tuning ,Computer science ,business.industry ,Cryomodule ,Modal analysis ,Structural engineering ,business - Abstract
The present activity aims to test the Cryomodule SSR1 to validate the corresponding mixed multibody-finite element numerical model and to determine the range of frequencies in which the first natural modes of the structure lie. The experimental activity consisted of a hammer test of the cryomodule at an early assembly stage at which the internal parts, constituting the cold mass, are accessible and, thus, many accelerometers can be attached to the beam string. The comparison between the experimental results obtained for the sub-assembly and the numerical results obtained for the corresponding sub-model, derived from the previously developed complete model, allowed to assess the validity of the numerical model and to get feedback on the effectiveness of the placement of the sensors in capturing the dynamic response of the system during transportation. more...
- Published
- 2021
31. Mock-ups to Predict Beam Axis Displacements of Cavities and Solenoids in PIP-II SSR2 Cryomodule
- Author
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Jullian Delgado
- Subjects
Physics ,Optics ,business.industry ,Cryomodule ,Mock ups ,business ,Beam (structure) - Published
- 2021
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32. A dynamic collimation and alignment system for the Helmholtz linear accelerator
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Maksym Miski-Oglu, K. Aulenbacher, Viktor Gettmann, P. Forck, Malte Schwarz, Anna Rubin, Florian Dziuba, T. Sieber, Markus Basten, Julian List, M. Heilmann, Winfried Barth, Holger Podlech, Simon Lauber, S. Yaramyshev, Thorsten Kürzeder, and Christoph Burandt more...
- Subjects
Physics ,business.industry ,Collimated light ,Linear particle accelerator ,Transverse plane ,symbols.namesake ,Optics ,Cryomodule ,Helmholtz free energy ,symbols ,Continuous wave ,Physics::Accelerator Physics ,Thermal emittance ,ddc:620 ,business ,Instrumentation ,Beam (structure) - Abstract
Review of scientific instruments 92(11), 113306 - 113306-9 (2021). doi:10.1063/5.0069824, The upcoming commissioning of the superconducting (SC) continuous wave Helmholtz linear accelerators first of series cryomodule is going to demand precise alignment of the four internal SC cavities and two SC solenoids. For optimal results, a beam-based alignment method is used to reduce the misalignment of the whole cryomodule, as well as its individual components. A symmetric beam of low transverse emittance is required for this method, which is to be formed by a collimation system. It consists of two separate plates with milled slits, aligned in the horizontal and vertical direction. The collimation system and alignment measurements are proposed, investigated, and realized. The complete setup of this system and its integration into the existing environment at the GSI High Charge State Injector are presented, as well as the results of the recent reference measurements., Published by American Institute of Physics, [S.l.] more...
- Published
- 2021
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33. Accelerator Development at the FREIA Laboratory
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Rolf Wedberg, Anirban Bhattacharyya, Vitaliy Goryashko, Maja Olvegård, R. Santiago Kern, K. Pepitone, Volker Ziemann, Han Li, Marek Jacewicz, A. Wiren, T. Peterson, Johan Eriksson, Kjell Fransson, E. Pehlivan, Akira Miyazaki, Tor Lofnes, Åke Jönsson, Lars Hermansson, Konrad Gajewski, Dragos Dancila, Magnus Jobs, Tord Ekelof, Rutambhara Yogi, Anders Rydberg, and Roger Ruber more...
- Subjects
Cryostat ,Accelerator Physics (physics.acc-ph) ,Engineering ,Large Hadron Collider ,business.industry ,Nuclear engineering ,Amplifier ,Vacuum tube ,FOS: Physical sciences ,020206 networking & telecommunications ,02 engineering and technology ,01 natural sciences ,7. Clean energy ,Superconducting accelerator ,law.invention ,law ,Cryomodule ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Physics - Accelerator Physics ,010306 general physics ,business ,Instrumentation ,Mathematical Physics - Abstract
The FREIA Laboratory at Uppsala University focuses on superconducting technology and accelerator development. It actively supports the development of the European Spallation Source, CERN, and MAX IV, among others. FREIA has developed test facilities for superconducting accelerator technology such as a double-cavity horizontal test cryostat, a vertical cryostat with a novel magnetic field compensation scheme, and a test stand for short cryomodules. Accelerating cavities have been tested in the horizontal cryostat, crab-cavities in the vertical cryostat, and cryomodules for ESS on the cryomodule test stand. High power radio-frequency amplifier prototypes based on vacuum tube technology were developed for driving spoke cavities. Solid-state amplifiers and power combiners are under development for future projects. We present the status of the FREIA Laboratory complemented with results of recent projects and future prospects., Comment: 30 pages, 18 figures more...
- Published
- 2021
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34. Investigations of Long-Range Wakefield Effects in a TESLA-type Cryomodule at FAST
- Author
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Dean Edstrom, Feng Zhou, Bryce Jacobson, Auralee Edelen, Jorge Diaz Cruz, Jinhao Ruan, Alex Lumpkin, Randy Thurman-Keup, Peter Prieto, and John Sikora
- Subjects
Nuclear physics ,Range (particle radiation) ,Materials science ,Cryomodule - Published
- 2021
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- View/download PDF
35. A 400-mA Stable Beam Store with a Superconducting RF System at the PLS-II
- Author
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Sohn, Younguk, Joo, Young-do, Yu, In-ha, Chun, Myung-hwan, and Park, In-soo
- Published
- 2018
- Full Text
- View/download PDF
36. A multilevel finite element-multibody approach to design the suspension system for the road transportation of SSR1 cryomodule
- Author
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Paolo Neri, Donato Passarelli, and Francesco Bucchi
- Subjects
Cryomodule transportation ,Field (physics) ,Iterative design ,business.industry ,Computer science ,Mechanical Engineering ,Reduced order modeling ,Phase (waves) ,lcsh:TA1001-1280 ,Aerospace Engineering ,Structural engineering ,Finite element method ,Suspension system ,Acceleration ,Software ,Modal ,Mechanical filter ,Cryomodule ,Automotive Engineering ,Vibration isolation ,lcsh:Transportation engineering ,Safety, Risk, Reliability and Quality ,business ,Civil and Structural Engineering - Abstract
Cryomodules (CM) represents edge-frontier assemblies in particle physics research field. The road transportation of CM is a critical phase during which the structures can be subjected to significant dynamic loads. It is therefore necessary to design a Transportation Tool (TT) equipped with an appropriate suspension system. This work describes the approach adopted for the design of the TT for the CM PIP-II SSR1 (Proton Improvement Plan-II – Single Spoke Resonators 1), which is firstly introduced in the CM research field. Initially a Finite Element (FE) model was developed, considering the main sub-assemblies of the CM. However, this model was not suitable for the design of the TT due to the high computational burden. For this reason the model was exported as a Modal Neutral File and imported into a MultiBody software (MB) where the remaining components were modeled as concentrated stiffnesses or rigid bodies. The MB model thus obtained has drastically reduced the calculation time, proving to be fundamental in the TT iterative design phase, which involves the use of Helical Isolators (HI) performing the function of mechanical filters. To validate the effectiveness of TT in reducing dynamic loads, a 3D acceleration profile measured during the transport of a similar cryomodule (Linear Coherent Light Source II, LCLS-II) was used. Furthermore, the results of the MB model were used to perform the structural verification of some critical components of the CM. more...
- Published
- 2020
37. Transportation analysis and related design optimization of the Fermilab high-beta 650 MHz cryomodule
- Author
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Josh Frank Helsper
- Subjects
Computer science ,Nuclear engineering ,Particle accelerator ,computer.software_genre ,Linear particle accelerator ,Simulation software ,law.invention ,Proton (rocket family) ,law ,Beta (plasma physics) ,Cryomodule ,Fermilab ,computer ,Fermi Gamma-ray Space Telescope - Abstract
The Proton Improvement Plan-II (PIP-II) at Fermi National Accelerator Laboratory (FNAL) will create a new and vastly improved accelerator, which will be the source of high-energy particles for the experiments taking place at FNAL. The new linear accelerator (LINAC) contains several types of cryomodules, which are individual particle accelerators. The last cryomodule in the LINAC will be the High-Beta 650 (HB650), which will operate at 650 MHz. Each module is approximately 15 meters in length and 1.5 meters wide, weighs 13 tonnes, and shares many design features with three of the other cryomodules. The HB650 consists of two primary sections, the outer vacuum vessel and the components that reside within it, which will be cooled to cryogenic temperatures – the cold mass. Once assembly is complete at FNAL, it will be transported to one of three places: another location at FNAL, another national laboratory within the continental United States, or to a scientific partner in Europe. Any excitation the module experiences, such as going over rough roads when on a semitrailer, can create high stresses in components and cause failure if severe enough. Additionally, any delicate components with low resonant frequencies that match the excitation spectrum could achieve resonance, potentially causing a fatigue failure by repeated flexing. To ensure the successful transportation of the HB650, a transport analysis utilizing ANSYS simulation software has been performed on major subassemblies, as well as analysis of the subassemblies as a combined system. The optimization of components, design of support structures, and overall increasing of the lowest resonant frequencies have resulted in a cryomodule that will be better equipped to handle transportation and any large impact loads that come with it. more...
- Published
- 2020
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38. Longitudinal phase space reconstruction for a heavy ion accelerator
- Author
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Manuel Heilmann, T. Sieber, Simon Lauber, Florian Dziuba, Stepan Yaramyshev, Malte Schwarz, Viktor Gettmann, Anna Rubin, K. Aulenbacher, Maksym Miski-Oglu, Julian List, Christoph Burandt, Thorsten Kürzeder, Peter Forck, Holger Podlech, and Winfried Barth more...
- Subjects
Physics ,Nuclear and High Energy Physics ,Tomographic reconstruction ,Physics and Astronomy (miscellaneous) ,010308 nuclear & particles physics ,business.industry ,Surfaces and Interfaces ,Tracking (particle physics) ,01 natural sciences ,Linear particle accelerator ,Optics ,Phase space ,Cryomodule ,0103 physical sciences ,Quadrupole ,Continuous wave ,Physics::Accelerator Physics ,lcsh:QC770-798 ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,010306 general physics ,business ,Beam (structure) - Abstract
At the GSI Helmholtzzentrum f\"ur Schwerionenforschung (GSI) in Darmstadt, Germany, a prototype cryomodule (advanced demonstrator) for the superconducting (SC) continuous wave (CW) Helmholtz Linear Accelerator (HELIAC) is under construction. A transport line, comprising quadrupole lenses, rebuncher cavities, beam correctors, and adequate beam instrumentation has been built to deliver the beam from the GSI 1.4 MeV/u High Charge Injector (HLI) to the advanced demonstrator, which offers a test environment for SC CW multigap cavities. In order to achieve proper phase space matching, the beam from the HLI must be characterized in detail. In a dedicated machine experiment the bunch shape has been measured with a nondestructive bunch shape monitor (BSM). Therefore, different bunch projections were obtained by altering the voltage of two rebunchers. These measurements were combined with dedicated beam dynamics simulations using the particle tracking code dynamion. The longitudinal bunch shape and density distribution at the beginning of the matching line are fully characterized by a tomographic reconstruction method based on a non-negative least square minimization approach. more...
- Published
- 2020
39. Superconducting radio-frequency cavity fault classification using machine learning at Jefferson Laboratory
- Author
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Anna Shabalina Solopova, Khan M. Iftekharuddin, Lasitha Vidyaratne, Tom Powers, Christopher Tennant, and Adam Carpenter
- Subjects
Accelerator Physics (physics.acc-ph) ,FOS: Computer and information sciences ,Computer Science - Machine Learning ,Nuclear and High Energy Physics ,Operability ,Physics and Astronomy (miscellaneous) ,Computer science ,FOS: Physical sciences ,Fault (power engineering) ,Machine learning ,computer.software_genre ,01 natural sciences ,Linear particle accelerator ,Machine Learning (cs.LG) ,Reliability (semiconductor) ,0103 physical sciences ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,010306 general physics ,010308 nuclear & particles physics ,business.industry ,Superconducting radio frequency ,Surfaces and Interfaces ,Cryomodule ,lcsh:QC770-798 ,Physics - Accelerator Physics ,Artificial intelligence ,business ,computer - Abstract
We report on the development of machine learning models for classifying C100 superconducting radio-frequency (SRF) cavity faults in the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab. CEBAF is a continuous-wave recirculating linac utilizing 418 SRF cavities to accelerate electrons up to 12 GeV through 5-passes. Of these, 96 cavities (12 cryomodules) are designed with a digital low-level RF system configured such that a cavity fault triggers waveform recordings of 17 RF signals for each of the 8 cavities in the cryomodule. Subject matter experts (SME) are able to analyze the collected time-series data and identify which of the eight cavities faulted first and classify the type of fault. This information is used to find trends and strategically deploy mitigations to problematic cryomodules. However manually labeling the data is laborious and time-consuming. By leveraging machine learning, near real-time (rather than post-mortem) identification of the offending cavity and classification of the fault type has been implemented. We discuss performance of the ML models during a recent physics run. Results show the cavity identification and fault classification models have accuracies of 84.9% and 78.2%, respectively., 20 pages, 10 figures submitted to Physical Review Accelerators and Beams more...
- Published
- 2020
40. Submicropulse electron-beam dynamics correlated with short-range wakefields in Tesla-type superconducting rf cavities
- Author
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Randy Thurman-Keup, J. Ruan, Alex Lumpkin, and Dean Edstrom
- Subjects
Physics ,Nuclear and High Energy Physics ,Physics and Astronomy (miscellaneous) ,International Linear Collider ,010308 nuclear & particles physics ,business.industry ,Streak camera ,Surfaces and Interfaces ,Laser ,01 natural sciences ,Linear particle accelerator ,law.invention ,Optics ,law ,Cryomodule ,0103 physical sciences ,lcsh:QC770-798 ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,Fermilab ,010306 general physics ,business ,Beam (structure) ,Electron gun - Abstract
We report direct observations of submicropulse beam centroid shifts (head-tail kicks) correlated with short-range wakefields generated by off-axis electron-beam steering in Tesla-type superconducting rf cavities. The experiments were performed at the Fermilab Accelerator Science and Technology (FAST) Facility using its unique configuration of a photocathode rf gun injecting beam into two separated nine-cell cavities. The cavities are in series with corrector magnets and beam position monitors (BPMs) located before, between, and after them. The off-axis steering in the cavity was guided by the rf BPM data and higher-order mode circuitry targeting the first and second dipole passbands. The centroid shifts of up to 300 μm from head to tail of the ∼10-ps-long micropulses at 500 pC/b in a 3-MHz pulse train were measured via optical transition radiation at a downstream screen with a Hamamatsu C5680 synchroscan streak camera. We also showed that we could compensate such kicks from the first cavity with the short-range wakefields (SRWs) in the second cavity, and we observed the dilution of the beam size in the tail of the pulses. A simple numerical model of the SRW effect in a single Tesla cavity is compared to the experiment successfully. In principle, these fundamental results may be scaled to cryomodule configurations of major free-electron laser (FEL) facilities such as the European XFEL, Linac Coherent Light Source or LCLS-II XFEL, and the conceptual international linear collider. more...
- Published
- 2020
41. High Gradient Cryomodule Prototype for the International Linear Collider
- Author
-
Daniel Bafia
- Subjects
Physics ,International Linear Collider ,Nuclear engineering ,Cryomodule - Published
- 2020
- Full Text
- View/download PDF
42. A 400-mA Stable Beam Store with a Superconducting RF System at the PLS-II
- Author
-
In-Ha Yu, Myung-Hwan Chun, In-Soo Park, Youngdo Joo, and Younguk Sohn
- Subjects
010302 applied physics ,Coupling ,Brightness ,Materials science ,business.industry ,General Physics and Astronomy ,Particle accelerator ,02 engineering and technology ,Synchrotron light source ,021001 nanoscience & nanotechnology ,01 natural sciences ,Instability ,law.invention ,Optics ,Beamline ,law ,Cryomodule ,0103 physical sciences ,Physics::Accelerator Physics ,0210 nano-technology ,business ,Beam (structure) - Abstract
At Pohang Light Source (PLS)-II, superconducting RF cavities, which are used energy compensators and make up for the energy loss by emitting synchrotron radiation were developed for the high-brightness photon beam, which has a brightness two orders of magnitude higher than that of predecessor PLS because of a dramatic reduction in higher order modes. The initial beam current for beamline users’ experiments was 150 mA with one cavity, and it increased to 280 mA with two cavities and to 350 mA with three cavities. At beam currents above 320 mA a severe instability was caused by the coupler vacuum, which placed an operation limitation on the high-beam current. Through intensive study, the vacuum instability was avoided, resulting in a stable high beam current in both the decay mode and the top-up mode. The coupling between the forward power and the beam current will change depending on their intensities. When that happens, the positions of maximum induced voltage around the window would also change. The trend is for the position of the maximum induced voltage to approach the window and produce vacuum an instability when forward power is ramped up. When these revelations are considered, one can conclude that the improved relationship between the forward power and the beam current by adjusting the external Q value prevents the maximum induced voltage from occurring around window. Because of the finding of this study, stable operation with a high-beam was realized for as long as over 200 hours or more between faults. more...
- Published
- 2018
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43. Performance of the 2 × 4-cell superconducting linac module for the THz-FEL facility
- Author
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Wang Jianxin, Yang Linde, Lao Chenglong, Zhou Kui, Shen Xuming, Lin Sifen, Xiao Dexin, He Tianhui, Yang Xingfan, Wu Dai, Li Ming, Lu Xiang-Yang, Luo Xing, Shan Lijun, and Wang Hanbin
- Subjects
Physics ,Superconductivity ,Nuclear and High Energy Physics ,Fabrication ,010308 nuclear & particles physics ,Terahertz radiation ,business.industry ,Superconducting radio frequency ,Electron ,01 natural sciences ,Linear particle accelerator ,Optics ,Cryomodule ,0103 physical sciences ,010306 general physics ,business ,Instrumentation ,Beam (structure) - Abstract
A high average power THz radiation facility has been developed by the China Academy of Engineering Physics. It is the first CW THz user facility based on superconducting accelerator technology in China. The superconducting linac module, which contains two 4-cell 1.3 GHz TESLA-like superconducting radio frequency cavities, is a major component of this facility. The expected electron energy gain is 6–8 MeV with a field gradient of 8–10 MV/m. The design and fabrication of the linac module is complete. This paper discusses its assembly and results from cyromodule tests and beam commissioning. At 2 K, the cryomodule works smoothly and stably. Both cavities have achieved effective field gradients of 10 MV/m. In beam loading experiments, 8 MeV, 5 mA electron beams with an energy spread less than 0.2% have been produced, which satisfies our requirements. more...
- Published
- 2018
- Full Text
- View/download PDF
44. Temperature Measurement Techniques for RAON Cryomodule
- Author
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Moo Sang Kim, Yong Woo Jo, Young Kwan Kwon, Won-Gi Paeng, Yoochul Jung, Hoechun Jung, Min Ki Lee, Youngkwon Kim, Jong Wan Choi, Juwan Kim, and Heetae Kim
- Subjects
010302 applied physics ,Materials science ,Materials Science (miscellaneous) ,Nuclear engineering ,02 engineering and technology ,General Medicine ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Temperature measurement ,Conductor ,Cryomodule ,0103 physical sciences ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology - Published
- 2018
- Full Text
- View/download PDF
45. Industrialization of the nitrogen-doping preparation for SRF cavities for LCLS-II
- Author
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A. Burrill, F. Marhauser, Chuck Grimm, Katherine Wilson, Sam Posen, Ari Palczewski, A. Sukhanov, Marc Ross, Dan Gonnella, Sebastian Aderhold, Oleksandr Melnychuk, Y. Trenikhina, T.N.Khabiboulline, Kirk Davis, Dmitri Sergatskov, Edward Daly, and Anna Grassellino more...
- Subjects
010302 applied physics ,Physics ,Nuclear and High Energy Physics ,business.industry ,Superconducting radio frequency ,Nitrogen doping ,Niobium ,chemistry.chemical_element ,01 natural sciences ,Linear particle accelerator ,chemistry ,Cryomodule ,0103 physical sciences ,Continuous wave ,Optoelectronics ,Fermilab ,010306 general physics ,business ,Instrumentation - Abstract
The Linac Coherent Light Source II (LCLS-II) is a new state-of-the-art coherent X-ray source being constructed at SLAC National Accelerator Laboratory. It employs 280 superconducting radio frequency (SRF) cavities in order operate in continuous wave (CW) mode. To reduce the overall cryogenic cost of such a large accelerator, nitrogen-doping of the SRF cavities is being used. Nitrogen-doping has consistently been shown to increase the efficiency of SRF cavities operating in the 2.0 K regime and at medium fields (15–20 MV/m) in vertical cavity tests and horizontal cryomodule tests. While nitrogen-doping’s efficacy for improvement of cavity performance was demonstrated at three independent labs, Fermilab, Jefferson Lab, and Cornell University, transfer of the technology to industry for LCLS-II production was not without challenges. Here we present results from the beginning of LCLS-II cavity production. We discuss qualification of the cavity vendors and the first cavities from each vendor. Finally, we demonstrate that nitrogen-doping has been successfully transferred to SRF cavity vendors, resulting in consistent production of cavities with better cryogenic efficiency than has ever been achieved for a large-scale accelerator. more...
- Published
- 2018
- Full Text
- View/download PDF
46. More than 15 Years of CW SRF Operation at ELBE
- Author
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Arnold, A., Freitag, M., Lehnert, U., Michel, P., Murcek, P., Schneider, C., Teichert, J., Xiang, R., Arnold, A., Freitag, M., Lehnert, U., Michel, P., Murcek, P., Schneider, C., Teichert, J., and Xiang, R. more...
- Abstract
ELBE is a compact, accelerator-driven photon and particle source. Since 2001 it is operated as a user facility, providing more than 5500 hours of beam time each year. The electron accelerator is based on four superconducting 9-cell TESLA cavities that are driven in full CW operation to accelerate an average current of 1 mA up to beam energies of 40 MeV. The first part of the talk will summarize our experiences of operating TESLA cavities in CW. In detail, this includes their performance and attempts to improve it, as well as investigations on limitations. Additionally, we will discuss several issues that are related to the high average RF as well as beam power and we will present appropriate measures to protect the machine. In this regard, a resonant ring for RF component tests up to 100 kW was set up. The second part of the talk will focus on the development and operation of our SRF guns that are designed to produce short bunches with high charges and repetition rates of 1 MHz and beyond. Recently, SRF gun II was successfully transferred into routine user operation and delivers now more than 200 pC at 100 kHz to the experiment. First convincing results will be presented. more...
- Published
- 2019
47. Design and Performance of Focusing Lenses for Installation Into Superconducting Cryomodules of a Proton Linac.
- Author
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Nicol, Thomas H., Sergatskov, Dmitri A., Tartaglia, Michael A., Terechkine, Iouri, and Tompkins, John C.
- Subjects
- *
LENSES , *SUPERCONDUCTING magnets , *PROTONS , *PARTICLE accelerators , *MAGNETIC shielding , *SOLENOIDS , *RESONATORS , *MAGNETICS - Abstract
The high energy sections of the Fermilab HINS R&D proton linac will utilize superconducting spoke resonator (SSR) RF cavities. These will be assembled into cryomodules with strong solenoid focusing lenses closely interleaved with the cavities. A design for lenses has been made for the lower (SSR1) and higher (SSR2) energy ranges of the SSR-section. Prototype lenses for both SSR1 and SSR2 sections have been built and the SSR1 has been tested. Shielding is needed to reduce the solenoid fringe field on the cavity wall below the 10 \muT level, and a preliminary design was built and tested with the SSR1 prototype lens. We discuss the design requirements and challenges, and the results from quench testing and magnetic measurements of the SSR1 prototype lens. [ABSTRACT FROM AUTHOR] more...
- Published
- 2011
- Full Text
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48. Suppression of multipacting in high power RF couplers operating with superconducting cavities
- Author
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J. Wei, Alexander Plastun, Peter Ostroumov, T. Larter, S. Kazakov, Daniel Morris, Ting Xu, and John Popielarski
- Subjects
Physics ,Superconductivity ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,business.industry ,Amplifier ,Capacitive sensing ,RF power amplifier ,01 natural sciences ,Power (physics) ,Resonator ,Cryomodule ,0103 physical sciences ,Optoelectronics ,Antenna (radio) ,010306 general physics ,business ,Instrumentation - Abstract
Capacitive input couplers based on a 50 Ω coaxial transmission line are frequently used to transmit RF power to superconducting (SC) resonators operating in CW mode. It is well known that coaxial transmission lines are prone to multipacting phenomenon in a wide range of RF power level and operating frequency. The Facility for Rare Isotope Beams (FRIB) being constructed at Michigan State University includes two types of quarter wave SC resonators (QWR) operating at 80.5 MHz and two types of half wave SC resonators (HWR) operating at 322 MHz. As was reported in ref. [1] a capacitive input coupler used with HWRs was experiencing strong multipacting that resulted in a long conditioning time prior the cavity testing at design levels of accelerating fields. We have developed an insert into 50 Ω coaxial transmission line that provides opportunity to bias the RF coupler antenna and protect the amplifier from the bias potential in the case of breakdown in DC isolation. Two of such devices have been built and are currently used for the off-line testing of 8 HWRs installed in the cryomodule. more...
- Published
- 2017
- Full Text
- View/download PDF
49. Impact of Remanent Magnetic Field on the Heat Load of Original CEBAF Cryomodule
- Author
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M. Drury, G. Cheng, John Fischer, Gianluigi Ciovati, and Rong-Li Geng
- Subjects
010302 applied physics ,Physics ,Cryostat ,Magnetometer ,Nuclear engineering ,Superconducting radio frequency ,Niobium ,chemistry.chemical_element ,Particle accelerator ,Tuner ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,law.invention ,Magnetic field ,Nuclear magnetic resonance ,chemistry ,law ,Cryomodule ,0103 physical sciences ,Electrical and Electronic Engineering ,0210 nano-technology - Abstract
The heat load of the original cryomodules for the continuous electron beam accelerator facility is ~50% higher than the target value of 100 W at 2.07 K for refurbished cavities operating at an accelerating gradient of 12.5 MV/m. This issue is due to the quality factor of the cavities being ~50% lower in the cryomodule than when tested in a vertical cryostat, even at low RF field. Previous studies were not conclusive about the origin of the additional losses. We present the results of a systematic study of the additional losses in a five-cell cavity from a decommissioned cryomodule after attaching components, which are part of the cryomodule, such as the cold tuner, the He tank, and the cold magnetic shield, prior to cryogenic testing in a vertical cryostat. Flux-gate magnetometers and temperature sensors are used as diagnostic elements. Different cool-down procedures and tests in different residual magnetic fields were investigated during the study. Three flux-gate magnetometers attached to one of the cavities installed in the refurbished cryomodule C50-12 confirmed the hypothesis of high residual magnetic field as a major cause for the increased RF losses. more...
- Published
- 2017
- Full Text
- View/download PDF
50. Performance of Superconducting Magnet Prototypes for LCLS-II Linear Accelerator
- Author
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N. Andreev, Vladimir Kashikhin, G.V. Velev, A. Makarov, M. Tartaglia, and Joseph DiMarco
- Subjects
0301 basic medicine ,Physics ,030103 biophysics ,Physics::Instrumentation and Detectors ,Nuclear engineering ,Superconducting radio frequency ,Particle accelerator ,Superconducting magnetic energy storage ,Superconducting magnet ,Condensed Matter Physics ,01 natural sciences ,Linear particle accelerator ,Electronic, Optical and Magnetic Materials ,law.invention ,03 medical and health sciences ,Nuclear magnetic resonance ,law ,Dipole magnet ,Condensed Matter::Superconductivity ,Cryomodule ,Magnet ,0103 physical sciences ,Physics::Accelerator Physics ,Electrical and Electronic Engineering ,010306 general physics - Abstract
The new LCLS-II Linear Superconducting Accelerator at SLAC needs superconducting magnet packages installed inside SCRF (superconducting radio frequency technology) cryomodules to focus and steer an electron beam. Two magnet prototypes were built and successfully tested at Fermilab. Magnets have an iron-dominated configuration, quadrupole and dipole NbTi superconducting coils, and splittable in the vertical plane configuration. Magnets inside the cryomodule are conductively cooled through pure Al heat sinks. Both magnets' performance was verified by magnetic measurements at room temperature, and during cold tests in liquid helium. Test results including magnetic measurements are discussed. Special attention was given to the magnet performance at low currents where the iron yoke and the superconductor hysteresis effects have large influence. Both magnet prototypes were accepted for the installation in FNAL and JLAB prototype cryomodules. more...
- Published
- 2017
- Full Text
- View/download PDF
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