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Raguin, J.-Y.

Paper Title Page
TUPD032 Single Bunch Wakefields in the CERN-PSI-ELETTRA X-band Linear Accelerator 1997
 
  • M.M. El-Ashmawy, G. D'Auria
    ELETTRA, Basovizza
  • M.M. Dehler, J.-Y. Raguin
    PSI, Villigen
  • G. Riddone, R. Zennaro
    CERN, Geneva
  
 

FERMI@​ELETTRA and PSI-XFEL are 4th Gen­er­a­tion Light Sources that re­quire high qual­i­ty elec­tron beam at the en­trance of the un­du­la­tor chains. In this con­text, a spe­cial­ly de­vel­oped X-band struc­ture with in­te­grat­ed align­ment mon­i­tors will be used to mit­i­gate the non­lin­ear­i­ties in the lon­gi­tu­di­nal phase space due to the sec­ond order RF time cur­va­ture and the sec­ond order mo­men­tum com­paction term of chi­cane com­pres­sor. The knowl­edge of the trans­verse and lon­gi­tu­di­nal short range wake­fields in the X-band struc­ture is es­sen­tial to eval­u­ate the beam qual­i­ty in terms of lon­gi­tu­di­nal en­er­gy spread and trans­verse kick spread. We have used the ABCI code to nu­mer­i­cal­ly eval­u­ate the trans­verse and lon­gi­tu­di­nal wake po­ten­tials for short bunch­es in this struc­ture.

  
THPEA042 Engineering Design of a Multipurpose X-band Accelerating Structure 3771
 
  • D. Gudkov, G. Riddone, A. Samoshkin, R. Zennaro
    CERN, Geneva
  • M.M. Dehler, J.-Y. Raguin
    PSI, Villigen
  
 

PSI-XFEL and Elet­tra-Fer­mi-re­quire a X-band RF struc­ture. As CLIC is pur­su­ing a pro­gram for pro­duc­ing and test­ing x-band high-gra­di­ent RF struc­tures, a col­lab­o­ra­tion be­tween PSI, Elet­tra and CERN, has been es­tab­lished to build a mul­ti­pur­pose X-band ac­cel­er­at­ing struc­ture. This paper fo­cus­es on its en­gi­neer­ing de­sign which is based on disk-shaped cells bond­ed to­geth­er by dif­fer­ent tech­nolo­gies (dif­fu­sion bond­ing, vac­u­um braz­ing and laser beam weld­ing). The ac­cel­er­at­ing struc­ture con­sists of 2 cou­pler sub­assem­blies and 73 disks, and in­clude wake field mon­i­tor waveg­uides. The en­gi­neer­ing study also com­pris­es the ex­ter­nal cool­ing sys­tem, con­sist­ing of two par­al­lel cool­ing cir­cuits, and the tun­ing sys­tem, al­low­ing for the fine-tun­ing by means of cell de­for­ma­tions. The en­gi­neer­ing so­lu­tion for in­stal­la­tion and seal­ing of wake field mon­i­tor feed-through de­vices in­side the ac­cel­er­at­ing struc­ture RF-cav­i­ty is also pro­posed.