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19 results on '"Commeaux, C."'

1. Spiral 2 Cryogenic System Overview: Design, Construction and Performance Test.

Author

Deschildre, C., Bernhardt, J., Flavien, G., Crispel, S., Souli, M., and Commeaux, C.

Subjects
PARTICLE accelerators, CRYOGENICS, SUPERCONDUCTORS, HEAVY ion accelerators, EXOTIC nuclei, HELIUM, COMPRESSORS
Abstract

The new particle accelerator project Spiral 2 at GANIL ("Grand Accélérateur d'Ions Lourds, i.e. National Large Heavy Ion Accelerator) in Caen (France) is a very large installation, intended to serve fundamental research in nuclear physics. The heart of the future machine features a superconductor linear accelerator, delivering a beam until 20Mev/A, which are then used to bombard a matter target. The resulting reactions, such as fission, transfer, fusion, etc. will generate billions of exotic nuclei. To achieve acceleration of the beam, 26 cavities which are placed inside cryomodules at helium cryogenic temperature will be used. AL-AT (Air Liquide Advanced Technologies) takes part to the project by supplying cryogenic plant. The plant includes the liquefier associated to its compressor station, a large dewar, a storage tank for helium gas and transfer lines. In addition, a helium recovery system composed of recovery compressor, high pressure storage and external purifier has been supplied. Customized HELIAL LF has been designed, manufactured and tested by AL-AT to match the refrigeration power need for the Spiral 2 project which is around 1300 W equivalent at 4.5 K. [ABSTRACT FROM AUTHOR]

Published
2014
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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. STATUS OF THE LEGS POLARIZED HD TARGET.

Author

STEVEN WHISNANT, C., ARDASHEV, K., BADE, C., BARTALINI, O., BLECHER, M., CARACAPPA, A., COMMEAUX, C., D'ANGELO, A., DI SALVO, R., DIDELEZ, J. P., FANTINI, A., HICKS, K., HOBLIT, S., HONIG, A., GIBSON, C., KAGEYA, T., KHANDAKER, M., LINCOLN, F., LEHMANN, A., and LOWRY, M.

Subjects
POLARIZATION (Nuclear physics), POLARIZATION (Electricity), ELECTRIC currents, PARTICLE physics, CRYOSTATS, NUCLEAR magnetic resonance
Published
2005

4. Double-Polarization Experiments using Polarized HD at LEGS.

Author

Sandorfi, A. M., Ardashev, K., Bade, C., Bartalini, O., Blecher, M., Caracappa, A., Commeaux, C., D'Angelo, A., Di Salvo, R., Didelez, J. P., Fantini, A., Hicks, K., Hoblit, S., Honig, A., Gibson, C., Kageya, T., Khandakerg, M., Lincoln, F., Lehmann, A., and Lowry, M.

Subjects
POLARIZATION (Nuclear physics), NUCLEAR physics experiments, QUANTUM chromodynamics, QUARK models, PROTON decay
Published
2004

5. First Photo-Pion Double Polarization Experiments Using Polarized Hvector Dvector at LEGS.

Author

Hoblit, S., Ardashev, K., Bade, C., Blecher, M., Cacace, C., Caracappa, A., Cichocki, A., Commeaux, C., d'Angelo, A., Deininger, R., Didelez, J.-P., Gibson, C., Hicks, K., Honig, A., Kageya, T., Khandaker, M., Kistner, O., Lehmann, A., and Lincoln, F.

Subjects
POLARIZED beams (Nuclear physics), POLARIZATION (Nuclear physics)
Abstract

We report preliminary results of π photo-production using polarized γ beams and a polarized HD target. Four observables can be extracted simultaneously from the data, the cross section, the beam asymmetry Σ, and the double-polarization observables G and E. The latter determines the GDH sum rule integral. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003
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6. FIRST PHOTO-PION DOUBLE POLARIZATION EXPERIMENTS USING POLARIZED HD AT LEGS.

Author

SANDORFI, A. M., ARDASHEV, K., BADE, C., BLECHER, M., CACACE, C., CARACAPPA, A., CICHOCKI, A., COMMEAUX, C., D'ANGELO, A., DEININGER, R., DIDELEZ, J.-P., GIBSON, C., HICKS, K., HOBLIT, S., HONIG, A., KAGEYA, T., KHANDAKER, M., KISTNER, O., LEHMANN, A., and LINCOLN, F.

Subjects
PIONS, POLARIZATION (Nuclear physics), QCD sum rules (Nuclear physics), BACKSCATTERING, HADRONS
Published
2003

7. GDH AT GRAAL WITH POLARIZED HD TARGET.

Author

BOUCHIGNY, S., COMMEAUX, C., DIDELEZ, J.-P., GUIDAL, M., HOURANY, E., KUNNE, R., ROUILLE, G., BASSAN, M., D'ANGELO, A., DI SALVO, R., FANTINI, A., MORICCIANI, D., SCHAERF, C., BOCQUET, J.-P., LLERES, A., REBREYEND, D., KUZNETSOV, V., LAPIK, A., NEDOREZOV, V., and ROUDNEV, N. V.

Subjects
POLARIZATION (Nuclear physics), PROTONS, NEUTRONS, DEUTERONS, PHOTON beams
Published
2003

8. FIRST BEAM-TARGET DOUBLE-POLARIZATION MEASUREMENTS USING POLARIZED HD AT LEGS.

Author

LEHMANN, A., ARDASHEV, K., BADE, C., BLECHER, M., CACACE, C., CARACAPPA, A., CICHOCKI, A., COMMEAUX, C., DANCHEV, I., D'ANGELO, A., DEININGER, R., DIDELEZ, J. P., DI SALVO, R., GIBSON, C., HICKS, K., HOBLIT, S., HONIG, A., KAGEYA, T., KHANDAKER, M., and KISTNER, O. C.

Subjects
POLARIZATION (Nuclear physics), ELECTRON beams, PHOTON beams, LASER beams, PARTICLES (Nuclear physics), PARTICLE accelerators
Published
2003

9. STATUS AND PROSPECTS FOR POLARIZED D WITH THE SPHICE HD TARGET SYSTEM.

Author

LOWRY, M. M., ARDASHEV, K., BADE, C., BLECHER, M., CACACE, C., CARACAPPA, A., CICHOCKI, A., COMMEAUX, C., D'ANGELO, A., d'ANGELO, A., DEININGER, R., DIDELEZ, J.-P., GIBSON, C., HICKS, K., HOBLIT, S., HONIG, A., KAGEYA, T., KHANDAKAR, M., KISTNER, O. C., and LEHMANN, A.

Subjects
NUCLEAR magnetic resonance, MAGNETIC fields, X-ray diffraction, POLYMERS, CHEMICAL reactions
Published
2003
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10. PHOTOPRODUCTION EXPERIMENTS WITH POLARIZED HD TARGETS.

Author

BOUCHIGNY, S., COMMEAUX, C., DIDELEZ, J.-P., ROUILLE, G., GUIDAL, M., HOURANY, E., KUNNE, R., BASSAN, M., D'ANGELO, A., DI SALVO, R., FANTINI, A., MORICCIANI, D., SCHAERF, C., BOCQUET, J.-P., LLERES, A., REBREYEND, D., SANDRI, P. LEVI, GHIO, F., GIROLAMI, B., and BELLINI, V.

Subjects
POLARIZATION (Nuclear physics), POLARIZED photons, PARTICLE physics, PHOTON beams, SUPERCONDUCTING coils, ELECTROMAGNETIC shielding
Published
2002

11. NEUTRAL PION PRODUCTION FROM DEUTERIUM AT THE LEGS FACILITY.

Author

HICKS, K. H., ARDASHEV, K., BLECHER, M., CARACAPPA, A., CICHOCKI, A., COMMEAUX, C., D'ANGELO, A., DIDILEZ, J.-P., DEININGER, R., HOBLIT, S., KHANDAKER, M., KISTNER, O., KUCZEWSKI, A., LINCOLN, F., LINDGREN, R., LEHMANN, A., LOWRY, M., LUCAS, M., MEYER, H., and MICELI, L.

Subjects
NEUTRAL pion, PION production, NEUTRON scattering, MOMENTUM transfer, DEUTERIUM
Published
2002

12. THE FIRST PION PHOTOPRODUCTION RESULTS FROM POLARIZED HD AT LEGS.

Author

WHISNANT, C. STEVEN, ARDASHEV, K., BELLINI, V., BLECHER, M., CACACE, C., CARACAPPA, A., CICHOCKI, A., COMMEAUX, C., DANCHEV, I., D'ANGELO, A., DIDELEZ, J. P., DEININGER, R., GIBSON, C., HICKS, K., HOBLIT, S., HONIG, A., KAGEYA, T., KHANDAKER, M., KISTNER, O., and KUCZEWSKI, A.

Subjects
PION production, POLARIZED deuterons, COMPTON scattering, SUM rules (Physics), PARTICLE physics
Published
2002

13. THE LEGS DOUBLE POLARIZATION PROGRAM.

Author

BLECHER, M., ARDASHEV, K., CARACAPPA, A., COMMEAUX, C., D'ANGELO, A., DIDILEZ, J.-P., DEININGER, R., HICKS, K., HOBLIT, S., HONIG, A., KHANDAKER, M., KISTNER, O., KUCZEWSKI, A., LINCOLN, F., LINDGREN, R., LEHMANN, A., LOWRY, M., LUCAS, M., MEYER, H., and MICELI, L.

Subjects
POLARIZATION (Nuclear physics), GAMMA rays, PARTICLES (Nuclear physics), PIONS, NUCLEAR structure
Published
2001

14. POLARIZED TARGET DEVELOPMENTS FOR GRAAL AND PROSPECTS.

Author

COMMEAUX, C., DIDELEZ, J.-P., ROUILLE, G., GUIDAL, M., HOURANY, E., KUNNE, R., ZHAO, Q., BASSAN, M., D'ANGELO, A., MORICCIANI, D., SCHAERF, C., BELLINI, V., BOCQUET, J.-P., LLERES, A., REBREYEND, D., CASTOLDI, M., ZUCCHIATTI, A., GERVINO, G., GHIO, F., and GIROLAMI, B.

Subjects
POLARIZATION (Nuclear physics), SPECTRUM analysis, PROTONS, POLARIMETRY, HYDROGEN
Published
2001

15. AGOR CRYOGENICS: A STATUS REPORT.

Author

Pieterman, K., Dam, J. A. M., Commeaux, C., and Levy, G.

Subjects
CRYOGENICS, CRYOSTATS, CYCLOTRONS, PARTICLE accelerator design & construction, SUPERCONDUCTING coils, STABILITY (Mechanics)
Published
1991

17. Shifts between Nitrospira- and Nitrobacter-like nitrite oxidizers underlie the response of soil potential nitrite oxidation to changes in tillage practices.

Author

Attard, E., Poly, F., Commeaux, C., Laurent, F., Terada, A., Smets, B. F., Recous, S., and Roux, X. Le

Subjects
CARBON in soils, NITRIFYING bacteria, AGRICULTURE, NITRITES -- Environmental aspects, CLONING
Abstract

Despite their role in soil functioning, the ecology of nitrite-oxidizing bacteria, NOB, and their response to disturbances such as those generated by agricultural practices are scarcely known. Over the course of 17 months, we surveyed the potential nitrite oxidation, PNO, the abundance of the Nitrobacter- and Nitrospira-like NOB (by quantitative PCR) and the community structure of the Nitrobacter-like NOB (by PCR-DGGE and cloning-sequencing targeting the nxrA gene) in soils for four treatments: after establishment of tillage on a previously no-tillage system, after cessation of tillage on a previously tillage system, and on control tillage and no-tillage systems. Key soil variables (moisture, organic carbon content and gross mineralization – i.e. ammonification – measured by the 15N dilution technique) were also surveyed. PNO was always higher for the no-tillage than tillage treatments. Establishment of tillage led to a strong and rapid decrease in PNO whereas cessation of tillage did not change PNO even after 17 months. PNO was strongly and positively correlated to the abundance of Nitrobacter-like NOB and was also strongly related to gross mineralization, a proxy of N-availability; in contrast, PNO was weakly and negatively correlated to the abundance of Nitrospira-like NOB. Selection of a dominant population was observed under no-tillage, and PNO was loosely correlated to the community structure of Nitrobacter-like NOB. Our results demonstrate that Nitrobacter-like NOB are the key functional players within the NOB community in soils with high N availability and high activity level, and that changes in PNO are due to shifts between Nitrospira-like and Nitrobacter-like NOB and to a weaker extent by shifts of populations within Nitrobacter-like NOB. [ABSTRACT FROM AUTHOR]

Published
2010
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