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Your search keyword '"Commeaux, C."' showing total 4 results
Start Over Author "Commeaux, C." Topic nuclear physics
4 results on '"Commeaux, C."'

1. Double-polarization experiments using polarized HD at LEGS

Author

Sandorfi, A, Ardashev, K, Bade, C, Bartalini, O, Blecher, M, Caracappa, A, Commeaux, C, D'Angelo, A, Di Salvo, R, Didelez, J, Fantini, A, Hicks, K, Hoblit, S, Honig, A, Gibson, C, Kageya, T, Khandaker, M, Lincoln, F, Lehmann, A, Lowry, M, Lucas, M, Mahon, J, Miceli, L, Moricciani, D, Preedom, B, Norum, B, Schaerf, C, Stroher, H, Thorn, C, Wang, K, Whisnant, C, Wei, X, 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), J.P.Bocquet, V. Kuznetsov, D. Rebreyend, and LEGS

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Polarization (waves), 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Pion, Amplitude, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics
Abstract

A solid, polarized HD target has been developed for the measurement of double-polarization observables in the A resonance region. The focus of the experimental program is a comparison of pion photo-production amplitudes for the neutron and proton and the associated spin-dependent sum rules.

Published
2004

2. Thin-Thick Hydrogen Target for Nuclear Physics.

Author

Gheller, J. -M., Vinyar, I., Juster, F. -P., Authelet, G., Relland, J., and Commeaux, C.

Subjects
NUCLEAR physics, SOLID hydrogen, DEUTERIUM, FLUID flow, EXTRUSION process, VACUUM chambers, CRYOSTATS
Abstract

In spectroscopic studies of unstable nuclei, hydrogen targets are of key importance. The CHyMENE Project aims to provide to the nuclear physics community a thin and pure solid windowless hydrogen or deuterium target. CHyMENE project must respond to this request for the production of solid Hydrogen. The solid hydrogen target is produced in a continuous flow (1 cm/s) by an extrusion technique (developed with the PELIN laboratory) in a vacuum chamber. The shape of the target is determined by the design of the nozzle at the extrusion process. For the purpose, the choice is a rectangular shape with a width of 10 mm and a thickness in the range of 30-50 microns necessary for the physics objectives. The cryostat is equipped with a GM Cryocooler with sufficient power for the solidification of the hydrogen in the lower portion of the extruder. In the higher part of the cryostat, the hydrogen gas is first liquefied and partially solidified. It is then compressed at 100 bars in the cooled extruder before expulsion of the film through the nozzle at the center of the reaction vacuum chamber. After the previous step, the solid hydrogen ribbon falls by gravity into a dedicated chamber where it sublimes and the gas is pumped and evacuated in a exhaust line. This paper deals with the design of the cryostat with its equipment, with the sizing of the thermal bridge (Aluminum and copper), with the results regarding the contact resistance as well as with the vacuum computations of the reaction and recovery hydrogen gas chambers. [ABSTRACT FROM AUTHOR]

Published
2014
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3. Progress in the polarization of HD

Author

Bouchigny, S., Commeaux, C., Didelez, J.-P., and Rouillé, G.

Subjects
*NUCLEAR physics, *DEVELOPMENTAL biology, *SEPARATION (Technology), *DISTILLATION
Abstract

Abstract: The static polarization of HD samples has been achieved using “brute force”, for HD samples purified by double distillation. Proton polarization in excess of 60% and deuteron vector polarization higher than 14% have been reached. It has been demonstrated that the ageing technique allows to get relaxation times at 1.5K and 1T larger than a week. It is advocated that the conventional dynamic polarization of HD should be feasible for the proton and the deuteron contained in the HD molecule. This would create the possibility of polarizing DT molecules, increasing their reactivity when used as fuel in HIIF processes. [Copyright &y& Elsevier]

Published
2005
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4. Development of a beta 0.12, 88MHz, quarter-wave resonator and its cryomodule for the SPIRAL2 project

Author

Olry, G., Biarrotte, J.-L., Blivet, S., Bousson, S., Commeaux, C., Joly, C., Junquera, T., Lesrel, J., Roy, E., Saugnac, H., and Szott, P.

Subjects
*NUCLEAR physics, *PROPERTIES of matter, *RESONATORS, *PROTOTYPES
Abstract

Abstract: SPIRAL2 is a radioactive beams facility, composed of a superconducting linac driver, delivering deuterons with an energy of up to 40MeV (5mA) and heavy ions with an energy of 14.5MeV/u (1mA). This facility is now fully approved by the French government. The first prototype of beta 0.12 quarter-wave resonator has been recently fabricated by Zanon company and tested at IPN Orsay. The details on its fabrication and the results of the RF and mechanical tests at 4K will be presented. Then, we will show the design of the cryomodule-B, dedicated to the high energy section of the linac, which is now ready to be ordered. Finally, the last studies of the R&D program, such as the last optimizations of the geometry, the new developments of the tuning system and the design of the helium vessel, are described. [Copyright &y& Elsevier]

Published
2006
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