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Fouaidy, M.
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire1996
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire1996
AbstractAbstract
[en] This lecture is the preliminary of a research program on superconducting cavity resonators. The lecture topic aims at characterizing thermal conduction (and hence thermal losses) at the interface of two metals, one of them being superconductive. Some major works (Barnes and Dillinger, Little) are explained and discussed. (D.L.)
Original Title
Resistance thermique interfaciale a basse temperature entre un metal supraconducteur et un metal normal resistif
Source
1996; 13 p; 9 refs.
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Buelher, S.; Caruette, A.; Fouaidy, M.; Junquera, T.
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire1993
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire1993
AbstractAbstract
[en] The main effort of the SRF community at Orsay during the last five years was concentrated on the MACSE project (study, construction, assembly and test of 3 cryostats), participation to the TESLA project and R and D activities in close collaboration with the Saclay SRF group. 3 major topics are outlined and briefly discussed: cryogenics, scanning surface thermometers for diagnostics on SRF cavities and thermal behaviour analysis of HOM couplers. The main results obtained in this frame since the 5th SC workshop at Hamburg in 1991 are presented. (authors) 12 refs., 17 figs., 6 tabs
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1993; 14 p; CEBAF: 6. Workshop on RF superconductivity; Newport News, VA (United States); Oct 1993
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AbstractAbstract
[en] A quantitative experimental analysis of He II confined to a channel has been performed for the heat flux densities and bulk temperatures for which the transitions of He II to He I, He II to vapor, and He II to He I to vapor could occur in the neighborhood of the heating source or in the channel itself. Temperature measurements of the heater and the He I and He II channel flow were used in a thermohydrodynamic model of the heat flow. Emphasis was given to the $lambda transition and thus to the case where a He I layer separated the heater from the He II channel. The dynamics of the vaporized He I and He II bubbles and their role in heat transfer are analyzed
Source
Fast, R.W. (ed.); p. 407-416; 1988; p. 407-416; Plenum Press; New York, NY (USA); Cryogenic engineering conference; St. Charles, IL (USA); 14-18 Jun 1987
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Fouaidy, M.; Saki, M.; Hammoudi, N.; Simonet, L.
IPN, CNRS-IN2P3, Orsay (France). Funding organisation: Work supported through the European Community-Research Infrastructure Activity under the FP6 'Structuring the European Research Area' program, CARE, Brussels (Belgium)2007
IPN, CNRS-IN2P3, Orsay (France). Funding organisation: Work supported through the European Community-Research Infrastructure Activity under the FP6 'Structuring the European Research Area' program, CARE, Brussels (Belgium)2007
AbstractAbstract
[en] A dedicated apparatus was designed and constructed for studying the electromechanical behavior of prototype piezoelectric actuators subjected to a variable pre-loading force at cryogenic temperatures. This device was successfully used for testing a piezoelectric actuator of PICMA type from PITM, for T in the range 2 K-300 K. The dielectric properties as well as dynamic properties were measured including the actuator characteristics when used as force sensor. The corresponding data are reported and discussed. (authors)
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2007; 15 p; CONTRACT NO. RII3-CT-2003-506395; 12 refs., 2 tabs., 16 figs.
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Fouaidy, M.; Hammoudi, N., E-mail: fouaidy@ipno.in2p3.fr2006
AbstractAbstract
[en] In the framework of the R and D program on the TTF III main RF coupler, IPN Orsay developed in close collaboration with LAL institute, a dedicated facility for the electrical characterization of different materials at low temperature. This apparatus was used for measuring the electrical resistivity versus temperature (4.2 K-300 K) of various samples produced in the industry. These tests were performed in order to compare the RRR of the samples, qualify and find the optimum parameters for the coating process. Seven flat samples were tested in a saturated liquid helium bath under ∼1013 mbar pressure: measurements were performed on bare 316L samples, nickel coated 316L samples, and copper coated 316L samples with a nickel under layer. We investigated, in particular, the effect of vacuum annealing at 400 deg, C on the RRR of the copper coating. Our experimental data are compared to previous measurements reported by other groups, and theoretical results (e.g., Gruneisen-Bloch equation) and a good agreement was found. Finally, the tested samples fulfil the TTF III coupler design parameters requirements in terms of heat loads to the refrigerator at 2 K, 4 K and 70 K
Secondary Subject
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12. international workshop on RF superconductivity; Ithaca, NY (United States); 10-15 Jul 2005; S0921-4534(06)00168-7; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Fouaidy, M.; Martinet, G.; Hammoudi, N.; Chatelet, F.; Olivier, A.; Blivet, S.; Galet, F.
CNRS-IN2P3-IPN Orsay, Orsay (France). Funding organisation: Work supported by the European Community-Research Infrastructure Activity under the FP6 'Structuring the European Research Area' program, Brussels (Belgium)2007
CNRS-IN2P3-IPN Orsay, Orsay (France). Funding organisation: Work supported by the European Community-Research Infrastructure Activity under the FP6 'Structuring the European Research Area' program, Brussels (Belgium)2007
AbstractAbstract
[en] Piezoelectric actuators, which are integrated into the cold tuning system and used to compensate the small mechanical deformations of the cavity wall induced by Lorentz forces due to the high electromagnetic surface field, may be located in the radiation environment during particle accelerator operation. In order to provide for a reliable operation of the accelerator, the performance and life time of piezoelectric actuators (∼24.000 units for ILC) should not show any significant degradation for long periods (i.e. machine life duration: ∼20 years), even when subjected to intense radiation (i.e. gamma rays and fast neutrons). An experimental program, aimed at investigating the effect of fast neutrons radiation on the characteristics of piezoelectric actuators at liquid helium temperature (i.e. T∼4.2 K), was proposed for the working package WPNo.8 devoted to tuners development in the frame of CARE project. A neutrons irradiation facility, already installed at the CERI cyclotron located at Orleans (France), was upgraded and adapted for actuators irradiations tests purpose. A deuterons beam (maximum energy and beam current: 25 MeV and 35μA) collides with a thin (thickness: 3 mm) beryllium target producing a high neutrons flux with low gamma dose (∼20%): a neutrons fluence of more than 1014 n/cm2 is achieved in ∼20 hours of exposure. A dedicated cryostat was developed at IPN Orsay and used previously for radiation hardness test of calibrated cryogenic thermometers and pressure transducers used in LHC superconducting magnets. This cryostat could be operated either with liquid helium or liquid argon. This irradiation facility was upgraded for allowing fast turn-over of experiments and a dedicated experimental set-up was designed, fabricated, installed at CERI and successfully operated for radiation hardness tests of several piezoelectric actuators at T∼4.2 K. This new apparatus allows on-line automatic measurements of actuators characteristics and the cryogenic parameters. Further, the test-cell and actuators are equipped with high purity Ni foils for measuring the total neutron dose by an activation method. In this report, the details of the irradiation test facility will be described then the experimental data will be analyzed and discussed. (authors)
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2007; 20 p; EU CONTRACT NUMBER RII3-CT-2003-506395; 11 refs., 5 tabs., 21 figs.
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ACCELERATORS, BARYONS, CYCLIC ACCELERATORS, ELECTRICITY, ELECTROMAGNETIC RADIATION, ELECTRONIC EQUIPMENT, ELEMENTARY PARTICLES, EQUIPMENT, FERMIONS, HADRONS, HARDENING, IONIZING RADIATIONS, NEUTRONS, NUCLEONS, PHYSICAL RADIATION EFFECTS, RADIATION EFFECTS, RADIATIONS, RESONATORS, STORAGE RINGS, SYNCHROTRONS, TEMPERATURE RANGE
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Fouaidy, M.; Junquera, T.; Bousson, S.
Proceedings of the seventh workshop on RF superconductivity. V. 21996
Proceedings of the seventh workshop on RF superconductivity. V. 21996
AbstractAbstract
[en] A special SRF niobium cavity operating at 3.6 GHz in the TM020 mode has been designed for field emission studies and successfully tested. Heavy FE was observed for a peak surface electric field Epk≥40 MV/m. This FE electron loading was investigated using different diagnostic systems: electron current probe, FE induced X-rays intensity mapping system (scanning photodiodes) and a NaI detector for X-rays spectrum analysis purpose. Primary FE electron trajectories are calculated and stable emission sites leading to the observed X-rays maps hot spots are successfully located for different experimental run conditions. The measured X-rays spectra are in good agreement with the numerical simulation results hence allowing a good calibration of the peak surface electric field by comparison to the electromagnetic fields distribution computed with the URMEL code. (author)
Primary Subject
Source
Bonin, B. (ed.); [417 p.]; ISBN 2-7272-0186-9; ; Jan 1996; p. 373-377; Institut National de Physique Nucleaire et de Physique des Particules; Paris (France); 7. Workshop on RF superconductivity; Gif-sur-Yvette (France); 17-20 Oct 1995; 8 refs.
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Fouaidy, M.; Junquera, T.; Chel, S.; Mosnier, A.
Proceedings of the 1993 Particle Accelerator Conference: Volume 21993
Proceedings of the 1993 Particle Accelerator Conference: Volume 21993
AbstractAbstract
[en] The thermal behavior of a open-quotes fish hookclose quotes type HOM coupler for Superconducting RF Cavities is analyzed by numerical simulation using a 3D finite element based code for both CW (rings, recirculating linacs) and pulsed (s.c. colliders studies like TESLA) accelerator types. Consequently, a thorough study of the thermal stability of this system is necessary in both transient and steady-state regimes. Numerical simulations, assuming anomalous losses at the end of the HOM inner conductor, were performed. The effects of the HOM coupler geometry and the materials thermal conductivity on the critical heat flux inducing the quench of the system are discussed
Primary Subject
Source
Institute of Electrical and Electronics Engineers, Inc., New York, NY (United States); American Physical Society, Washington, DC (United States); 956 p; 1993; p. 855-857; PAC '93: international particle accelerator conference; Washington, DC (United States); 17-20 May 1993; Available from IEEE Service Center, 445 Hoes Lane, Piscataway, NJ 08854-4150
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AbstractAbstract
[en] In this paper thermometry of Niobium Superconducting RF cavities, working in HeII is studied. Surface heating at the external wetted side of the cavity is measured with special thermometers. Two models are presented: scanning thermometers mounted on a rotating frame, and fixed thermometers. Calibration of fixed thermometers for more accurate temperature measurements was conducted in a special test chamber. Thermal response for different mounting conditions and influence of the bath temperature are discussed. A numerical study of the thermometer including the test setup was performed and comparison with experimental results shows good agreement. Experimental results with scanning thermometers shows qualitative observations and location of different defects encountered in cavities
Secondary Subject
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Kelly, J.P.; Schneider, W.J; 56 p; ISBN 0-7918-0479-8; ; 1990; p. 15-22; American Society of Mechanical Engineers; New York, NY (United States); 5. AIAA/ASME thermophysics and heat transfer conference; Seattle, WA (United States); 18-20 Jun 1990; CONF-900619--; American Society of Mechanical Engineers, 345 East 47 St., New York, NY 10017 (United States)
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Bousson, S.; Caruette, A.; Fouaidy, M.
Inst. de Physique Nucleaire, Paris-11 Univ., 91 - Orsay (France)
Report of Activity, 1996 - 1997. Vol. 3. General activities - Technical Research1999
Inst. de Physique Nucleaire, Paris-11 Univ., 91 - Orsay (France)
Report of Activity, 1996 - 1997. Vol. 3. General activities - Technical Research1999
AbstractAbstract
[en] A research and development program concerning new fabrication techniques of superconducting RF cavities has started. The technique is based on copper plasma sprayed onto thin wall niobium cavities. The results of the first two cavities tested before and after the copper deposition showed no (or only slight) degradations of the cavity performances when the copper layer is added. (authors)
Original Title
Cavites acceleratrices supraconductrices en niobium cuivrees par projection plasma
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Secondary Subject
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Pouthas, Joel; Hutin, Christiane; Niogret Mathias (Inst. de Physique Nucleaire, Paris-11 Univ., 91 - Orsay (France)) (eds.); Inst. de Physique Nucleaire, Paris-11 Univ., 91 - Orsay (France); 155 p; 1999; p. 19-20; 2 refs., 3 figs.
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