Search

Your search keyword '"C. A. Bompas"' showing total 8 results
Start Over Author "C. A. Bompas"
8 results on '"C. A. Bompas"'

1. Results from the TARC experiment: spallation neutron phenomenology in lead and neutron-driven nuclear transmutation by adiabatic resonance crossing

Author

F. Casagrande, V. Vlachoudis, P. Kokkas, S. Andriamonje, E. Savvidis, J. Bueno, M. Perlado, Pantelis Karaiskos, Konstantin Zioutas, M. Embid, P. Cennini, C. Geles, E. González, D. Trubert, E. Perez-Enciso, A. Angelopoulos, S. Buono, George Kitis, P. Pavlopoulos, J. Aleixandre, I. Papadopoulos, J.M. Loiseaux, C. Sirvent, V. Lacoste, J.B. Viano, J. I. Collar, J. Galvez, J. Tamarit, F. Schussler, J. Oropesa, J. P. Revol, J. A. Rubio, A. Pérez-Navarro, E. Belle, M. Poza, C. Eleftheriadis, J. Garcia, A. Apostolakis, M. Hussonnois, A. Placci, D. Heuer, Loukas Sakelliou, C. López, O. Méplan, A. Giorni, S. Dı́ez, H. Nifenecker, C. A. Bompas, F. Saldana, C. Rubbia, C. Le Naour, Alberto Abánades, H. Arnould, R. Del Moral, I. Goulas, S. Vieira, R. Klapisch, José M. Martínez-Val, E. Cerro, A. Tzima, L. Dumps, Y. Kadi, R. Fernandez, D. Brozzi, O. González, Federico Carminati, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and TARC

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Proton, Nuclear transmutation, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Particle detector, Energy amplifier, Nuclear physics, Neutron capture, 13. Climate action, 0103 physical sciences, Spallation, Neutron, Nuclear Experiment, 010306 general physics, Instrumentation, Nuclear Physics
Abstract

We summarize here the results of the TARC experiment whose main purpose is to demonstrate the possibility of using Adiabatic Resonance Crossing (ARC) to destroy efficiently Long-Lived Fission Fragments (LLFFs) in accelerator-driven systems and to validate a new simulation developed in the framework of the Energy Amplifier programme. An experimental set-up was installed in a CERN PS proton beam line to study how neutrons produced by spallation at relatively high energy ( E n ⩾1 MeV ) slow down quasi-adiabatically with almost flat isolethargic energy distribution and reach the capture resonance energy of an element to be transmuted where they will have a high probability of being captured. Precision measurements of energy and space distributions of spallation neutrons (using 2.5 and 3.5 GeV/c protons) slowing down in a 3.3 m×3.3 m×3 m lead volume and of neutron capture rates on LLFFs 99Tc, 129I, and several other elements were performed. An appropriate formalism and appropriate computational tools necessary for the analysis and understanding of the data were developed and validated in detail. Our direct experimental observation of ARC demonstrates the possibility to destroy, in a parasitic mode, outside the Energy Amplifier core, large amounts of 99Tc or 129I at a rate exceeding the production rate, thereby making it practical to reduce correspondingly the existing stockpile of LLFFs. In addition, TARC opens up new possibilities for radioactive isotope production as an alternative to nuclear reactors, in particular for medical applications, as well as new possibilities for neutron research and industrial applications.

Published
2002
Full Text
View/download PDF

2. Experimental verification of neutron phenomenology in lead and of transmutation by adiabatic resonance crossing in accelerator driven systems

Author

O. Méplan, R. Fernandez, L. Dumps, Alberto Abánades, H. Arnould, R. Del Moral, V. Vlachoudis, I. Goulas, E. González, F. Casagrande, George Kitis, C. A. Bompas, C. Le Naour, C. Sirvent, S. Vieira, D. Heuer, E. Cerro, H. Nifenecker, F. Saldana, P. Pavlopoulos, J. Bueno, J. P. Revol, Federico Carminati, J. Aleixandre, R. Klapisch, E. Savvidis, J.M. Loiseaux, José M. Martínez-Val, M. Perlado, S. Andriamonje, I. Papadopoulos, V. Lacoste, Konstantin Zioutas, J. Garcia, A. Giorni, D. Brozzi, M. Embid, S. Dı́ez, J. Galvez, Pantelis Karaiskos, A. Apostolakis, O. González, P. Cennini, A. Placci, M. Hussonnois, Y. Kadi, S. Buono, A. Angelopoulos, A. Tzima, Loukas Sakelliou, C. López, J. Tamarit, D. Trubert, E. Perez-Enciso, J.B. Viano, C. Geles, A. Pérez-Navarro, J. Oropesa, C. Rubbia, E. Belle, M. Poza, J. A. Rubio, J. I. Collar, P. Kokkas, F. Schussler, and C. Eleftheriadis

Subjects
Physics, Nuclear and High Energy Physics, Neutron transport, Nuclear transmutation, 010308 nuclear & particles physics, 7. Clean energy, 01 natural sciences, Neutron temperature, Energy amplifier, Nuclear physics, Neutron capture, 0103 physical sciences, Physics::Accelerator Physics, Spallation, Neutron, Nuclear Experiment, 010306 general physics, Adiabatic process, Instrumentation
Abstract

The Transmutation by Adiabatic Resonance Crossing (TARC) experiment was carried out as PS211 at the CERN PS from 1996 to 1999. Energy and space distributions of spallation neutrons (produced by 2.5 and 3.57 GeV/c CERN proton beams) slowing down in a 3.3×3.3×3 m3 lead volume and neutron capture rates on long-lived fission fragments 99Tc and 129I demonstrate that Adiabatic Resonance Crossing (ARC) can be used to eliminate efficiently such nuclear waste and validate innovative simulation.

Published
2001
Full Text
View/download PDF

3. Valve replacement in patients with critical aortic stenosis and depressed left ventricular function: predictors of operative risk, left ventricular function recovery, and long term outcome

Author

C. De Place, B Vaquette, Claude Daubert, M. Laurent, Christophe Leclercq, C Froger-Bompas, Thierry Langanay, Alain Leguerrier, Hervé Corbineau, and Bernard Lelong

Subjects
Aortic valve, Male, medicine.medical_specialty, medicine.medical_treatment, macromolecular substances, Risk Assessment, Ventricular Dysfunction, Left, Postoperative Complications, Aortic valve replacement, Valve replacement, Risk Factors, Internal medicine, medicine, Humans, Intraoperative Complications, Aged, Heart Valve Prosthesis Implantation, Interventional Cardiology and Surgery, Ejection fraction, business.industry, Left bundle branch block, fungi, Editorials, food and beverages, Aortic Valve Stenosis, Recovery of Function, medicine.disease, Survival Analysis, Confidence interval, Hospitalization, medicine.anatomical_structure, Treatment Outcome, Heart failure, Aortic valve stenosis, Aortic Valve, Cardiology, cardiovascular system, Female, Cardiology and Cardiovascular Medicine, business, Follow-Up Studies
Abstract

To identify predictors of operative and postoperative mortality and of functional reversibility after aortic valve replacement (AVR) in patients with aortic stenosis (AS) and severe left ventricular (LV) systolic dysfunction.Between 1990 and 2000, 155 consecutive patients (mean (SD) age 72 (9) years) in New York Heart Association (NYHA) heart failure functional class III or IV (n = 138) and with LV ejection fraction (LVEF)or = 30% underwent AVR for critical AS (mean (SD) valve area index 0.35 (0.09) cm2/m2). Thirty day mortality was 12%. NYHA class (3.7 (0.6) v 3.2 (0.7), p = 0.004), cardiothoracic ratio (CTR) (0.63 (0.07) v 0.56 (0.06), p0.0001), pulmonary artery systolic pressure (63 (25) v 50 (19) mm Hg, p = 0.03), and prevalence of complete left bundle branch block (22% v 8%, p = 0.03) and of renal insufficiency (p = 0.001) were significantly higher in 18 non-survivors than in 137 survivors. In multivariate analysis, the only independent predictor of operative mortality was a CTRor = 0.6 (odds ratio (OR) 12.2, 95% confidence interval (CI) 5.4 to 27.4, p = 0.002). The difference between preoperative and immediate postoperative LVEF (early-DeltaEF) was10 ejection fraction units (EFU) in 55 survivors. In multivariate analysis, CTR (OR 5.95, 95% CI 3.0 to 11.6, p = 0.006) and mean transaortic gradient (OR 1.05, 95% CI 1.0 to 1.1, p0.05) were independent predictors of an early-DeltaEF10 EFU. During a mean (SD) follow up of 4.6 (3) years, 50 of 137 (36%) 30 day survivors died, 31 of non-cardiac causes. Diabetes (OR 3.8, 95% CI 2.4 to 6.0, p = 0.003), ageor = 75 years (OR 2.6, 95% CI 2.1 to 4.5, p = 0.004), and early-DeltaEFor = 10 EFU (OR 0.96, 95% CI 0.94 to 0.97, p = 0.01) were independent predictors of long term mortality. Among 127 survivors, the percentage of patients in NYHA functional class III or IV decreased from 89% preoperatively to 3% at one year. The decrease in functional class was significantly greater in patients with an early-DeltaEF10 EFU than patients with an early-DeltaEFor = 10 EFU (p = 0.02). In addition, the mean (SD) LVEF at one year was 53 (11)% in patients with an early-DeltaEF10 EFU and 42 (11)% in patients with early-DeltaEFor = 10 EFU (p0.001).Despite a relatively high operative mortality, AVR for AS and severely depressed LVEF was beneficial in the majority of patients. Early postoperative recovery of LV function was associated with significantly greater relief of symptoms and longer survival.

Published
2005

4. Experimental verification of neutron phenomenology in lead and transmutation by adiabatic resonance crossing in accelerator driven systems

Author

José M. Martínez-Val, J.B. Viano, P. Cennini, J. Bueno, Alberto Abánades, H. Arnould, R. Del Moral, I. Goulas, E. Savvidis, F. Casagrande, S. Vieira, R. Fernandez, J. Oropesa, A. Apostolakis, A. Giorni, S. Dı́ez, A. Tzima, M. Hussonnois, S. Buono, L. Dumps, J. A. Rubio, C. Rubbia, J.M. Loiseaux, George Kitis, C. Eleftheriadis, M. Perlado, C. Le Naour, J. Gálvez, D. Trubert, E. Perez-Enciso, Vasilis Vlachoudis, Konstantin Zioutas, J. P. Revol, J. Aleixandre, M. Embid, R. Klapisch, E. Cerro, P. Kokkas, A. Pérez-Navarro, D. Brozzi, O. González, E. Belle, M. Poza, Y. Kadi, H. Nifenecker, F. Saldana, A. Angelopoulos, J. I. Collar, F. Schussler, Federico Carminati, J. Tamarit, O. Méplan, S. Andriamonje, C. A. Bompas, I. Papadopoulos, V. Lacoste, J. Garcia, Pantelis Karaiskos, A. Placci, Loukas Sakelliou, C. López, E. González, P. Pavlopoulos, C. Sirvent, C. Geles, D. Heuer, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Nuclear transmutation, Proton, 010308 nuclear & particles physics, Fission, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Resonance (particle physics), Accelerators and Storage Rings, Nuclear physics, Neutron capture, 0103 physical sciences, Physics::Accelerator Physics, Neutron, Spallation, 010306 general physics, Adiabatic process, Nuclear Experiment
Abstract

Energy and space distributions of spallation neutrons (from 2.5 and 3.57 GeV/c CERN proton beams) slowing down in a 3.3 x 3.3 x 3 m3 lead volume and neutron capture rates on long-lived fission fragments 99 Tc and 129 I demonstrate that Adiabatic Resonance Crossing (ARC) can be used to eliminate efficiently such nuclear waste and validate innovative simulation.

Published
1999

5. Neutron driven nuclear transmutation by adiabatic resonance crossing

Author

Federico Carminati, Loukas Sakelliou, C. López, A. Tzima, O. Méplan, A. Apostolakis, D. Heuer, M. Hussonnois, M. Perlado, Ioannis Papadopoulos, C. A. Bompas, J.B. Viano, M. Embid, J. Tamarit, P. Pavlopoulos, J.M. Loiseaux, A. Giorni, S. Dı́ez, J. Aleixandre, G. Zarris, M. Macri, F. Casagrande, S. Andriamonje, E. Pérez, Alberto Abánades, H. Arnould, R. Del Moral, I. Goulas, S. Vieira, O. González, E. Cerro, J. A. Rubio, J. Galvez, C. Roche, K. Sakelariou, C. Geles, C. Rubbia, E. González, Panagiotis Kokkas, C. Eleftheriadis, J. A. Garcia, Vasilis Vlachoudis, J. P. Revol, V. Lacoste, Y. Kadi, A. Angelopoulos, S. Buono, H. Nifenecker, F. Saldana, J. Bueno, D. Trubert, C. Le Naour, R. Klapisch, F. Attale, R. Fernandez, A. Pérez-Navarro, E. Belle, M. Poza, G. Kittis, F. Schussler, P. Cennini, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Fioni G. Faust H. Oberstedt S. Hambsch F.-J., and bibliotheque, LPSC

Subjects
Physics, Nuclear reaction, Nuclear transmutation, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Fission, Nuclear engineering, Radioactive waste, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010403 inorganic & nuclear chemistry, 7. Clean energy, 01 natural sciences, Resonance (particle physics), 0104 chemical sciences, Energy amplifier, Nuclear physics, 0103 physical sciences, Neutron, Nuclear Experiment, Adiabatic process
Abstract

The use of accelerator driven system (ADS) like for instance the Energy Amplifier concept (EA) proposed by C. Rubbia and his group might be one of the solutions to solve the energy problem and in particular to answer the question: what could we do with the nuclear waste produced by the present nuclear reactors? We present in this paper the EA concept, which is illustrated by two experiments performed at the CERN-PS facility. One of them is the TARC (Transmutation by Adiabatic Resonance crossing) experiment which is designed to demonstrate the high efficiency offered by the EA to destroy the long-lived fission fragments.

Published
1998

6. Transmutation of [sup 99]Tc in a low lethargy medium as a function of the neutron energy

Author

K. Sakelariou, A. Apostolakis, M. Hussonnois, C. Le Naour, C. Roche, D. Trubert, Vasilis Vlachoudis, S. Buono, J. P. Revol, J. Bueno, J.B. Viano, A. Pérez-Navarro, A. Angelopoulous, E. Belle, Y. Kadi, R. Fernandez, F. Shussler, J.M. Loiseaux, M. Perlado, M. Poza, Ioannis Papadopoulos, J. Aleixandre, M. Embid, P. Cennini, A. Giorni, S. Dı́ez, D. Heuer, Loukas Sakelliou, G. Zarris, C. López, E. Pérez, J. Tamarit, Alberto Abánades, H. Arnould, Federico Carminati, R. Del Moral, P. Pavlopoulos, I. Goulas, J. Galvez, S. Vieira, A. Tzima, M. Macri, F. Casagrande, O. Méplan, C. A. Bompas, O. González, E. Cerro, R. Klapish, C. Rubbia, V. Lacoste, George Kitis, C. Geles, E. González, Panagiotis Kokkas, S. Andriamonje, C. Eleftheriadis, J. A. Rubio, H. Nifenecker, F. Saldana, and J. A. Garcia

Subjects
Nuclear physics, Physics, Range (particle radiation), Proton, Nuclear transmutation, Neutron flux, Neutron cross section, Neutron, Spallation, Neutron temperature
Abstract

In the TARC experiment the differential neutron flux φ(E,r) of a spallation of 2.5 and 3.5 GeV/c proton in large lead block is measured in the range between 0.1 eV and 1.5 MeV. A new technique, using small quantities (less than 0.1 gram) of material, is used for measuring the transmutation rate as a function of neutron energy in the range between 0.1 eV up to a few keV. The method is applied to a target of 86 mg (99Tc) mixed with 1.7 g of Aluminum. From these measurements the energy profile of the capture cross section can be extracted.

Published
1998
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results