Author: Gonnin, A.
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TUPMB002 Status of THOMX Storage-ring Magnets 1100
  • C. Vallerand, C. Bruni, A. Gonnin, R. Marie, H. Monard
    LAL, Orsay, France
  • C. Benabderrahmane, M.-E. Couprie, A. Loulergue, F. Marteau
    SOLEIL, Gif-sur-Yvette, France
  The THOMX facility is a compact X-Ray source based on the Compton back scattering aiming at a flux of 1011 to 1013 ph/s in the range of energy from 40 to 90 keV. Due to the compactness and the expected stability of this machine, high requirements are set for all magnets in terms of design and manufacturing. First, the design optimization of the magnets is presented, leading to high performance in terms of harmonics. Issues regarding the cross-talk between quadrupole and sextupole fields are then discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB002  
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THPOW001 Design of a 4.6-Cell RF Gun for the PHIL accelerator at LAL 3922
  • P. Chen, C. Bruni, S. Chancé, L. Garolfi, A. Gonnin, P. Lepercq, T. Vinatier
    LAL, Orsay, France
  A photo-injector with 4.6-cell and resonate frequency of 2.998 GHz has been designed and studied to replace the 2.5-cell RF gun + booster association. The cavity iris shape and dimensions were simulated systematically to optimize the shunt impedance. In this study, electron beam reaches to 9.7 MeV with a moderate peak accelerat-ing gradient of 80 MV/m. Considering a beam charge of 1 nC/bunch, average transverse emittance of ~ 5.9 πmm mrad and energy spread of ~ 0.8% can be obtained at the exit of the gun. The RF input power is only 10.2 MW due to the high shunt impedance. Asymmetry of the electric field due to the coupling port has also been studied using 3D codes for RF and beam dynamics calculations. We will present the RF design and beam calculations results.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW001  
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THPOW002 Electromagnetic, Thermal, and Structural Analysis of a THOMX RF Gun Using ANSYS 3925
  • M. El Khaldi, J. Bonis, A. Camara, L. Garolfi, A. Gonnin
    LAL, Orsay, France
  Photocathode RF guns are used in the first stage of electron beam generation and acceleration. The RF gun of THOMX is a 2.5 cell standing wave copper cavity with resonance frequency of 2998.55 MHz at 30 °C under vacuum. The metal photocathode such as copper or magnesium is inserted into the backplane of the cavity. Due to high repetition rates up to 50 Hz with the average dissipated power into the internal surfaces up to 1.5 kW, causing a heating and deformation of the cavity shape. Therefore, the cooling system of the device has to be well designed to take under control the deformations of the structure, providing a temperature increase as small and uniform as possible. For this purpose a fully coupled electromagnetic-thermal-structural finite element analysis on this gun has been performed with Ansys workbench. Numerical results show that the gun could operate at 3 μs RF pulse length and 50 Hz repetition rate with an average dissipated power of 1.5 kW. The gun average temperature is around 30 °C while the incoming water temperature is around 24°C. Internal speed of water is 2.5 m/s which corresponds to 15 l/min for the incoming water. The total pressure drop is around 0.4 bar  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW002  
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