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Bousson, S.

Paper Title Page
TUP96 Mechanical Stability Simulations on a Quarter Wave Resonator for the SPIRAL II Project 504
 
  • H. Saugnac, J.-L. Biarrotte, S. Blivet, S. Bousson, M. Fouaidy, T. Junquera, G. Olry
    IPN, Orsay
  
  In the framework of the SPIRAL II project, IPN Orsay is studying a 88 MHz β=0.12 super conducting quarter wave resonator prototype. Due to its low RF bandwidth (around 60 Hz) the resonator must have a very high mechanical stability and have small sensitivity to dynamic mechanical loads. To simulate the effects of geometrical deformations on the fundamental RF frequency a three dimensional analysis is required. The simulations were made by coupling mechanical FEM analysis performed in COSMOS/GEOSTAR™ with the RF electromagnetic FEM code MICAV™ integrated in the COSMOS/GEOSTAR™ interface. Static mechanical loads were first studied to reduce the effects of external pressure on the RF frequency shift and evaluate the tuning sensitivity of the cavity. Then, simulations on the dynamic response of the resonator, using the modal superposition analysis method, with random external pressure variations and harmonic excitation of the cavity were performed. This paper presents the results of the simulations and mechanical solutions chosen to increase the cavity RF frequency stability.  
THP07 Performance Improvement of the Multicell Cavity Prototype for Proton LINAC Projects 611
 
  • B. Visentin, D. Braud, J.P. Charrier, B. Coadou, Y. Gasser, J.P. Poupeau, P. Sahuquet
    CEA/DSM/DAPNIA, Gif-sur-Yvette
  • S. Bousson, H. Gassot, H. Saugnac, P. Szott
    IPN, Orsay
  • G. Devanz
    CEA/DAPNIA-SACM, Gif-sur-Yvette Cedex
  
  The CEA-Saclay/IPN-Orsay collaboration allowed to develop a multicell superconducting cavity prototype (704 MHz, β=0.65). Since the first experimental results[*], achieved in a vertical cryostat and the horizontal one "CryHoLab", the accelerating field Eacc has been recently improved up to 19 MV/m (Epeak = 43 MV/m, Bpeak = 83 mT, Q0 = 9.109). Eacc is now limited by quench. The previous one limitation, due to a non understood phenomenon, disappeared . The excellent performances of this 5-cell proton cavity validate the design, the technological choices, the manufacturing and the cavity preparation process. These results augur well for our future R&D program on multicell superconducting cavities within the European CARE/HIPPI framework.

[*] Proceedings of PAC2003, Portland, USA, TAB047, p.1303