Author: Triantafyllou, A.
Paper Title Page
MOPC004 352.2 MHz HOM Damped Normal Conducting ESRF Cavity: Design and Fabrication 68
 
  • V. Serrière, A.K. Bandyopadhyay, D. Boilot, L. Goirand, J. Jacob, B. Ogier, A. Triantafyllou
    ESRF, Grenoble, France
  
  Funding: This work, carried out within the framework of the ESRFUP project, has received research funding from the EU Seventh Framework Programme, FP7.
The on­go­ing ESRF up­grade in­clud­ed an op­tion for an in­crease of the stor­age ring cur­rent from 200 to 300 mA, which has been test­ed suc­cess­ful­ly with the ex­ist­ing RF sys­tem. At this cur­rent level the HOM tun­ing of the ex­ist­ing five-cell cop­per cav­i­ties be­comes ex­treme­ly del­i­cate and in view of a fu­ture re­li­able op­er­a­tion in user mode, new HOM free nor­mal con­duct­ing cav­i­ties were de­vel­oped at the ESRF. The de­sign is based on the ex­ist­ing BESSY/ALBA cav­i­ty. How­ev­er, sev­er­al sub­stan­tial mod­i­fi­ca­tions have been im­ple­ment­ed and dif­fer­ent fab­ri­ca­tion pro­cess­es elab­o­rat­ed to im­prove the de­sign. Three op­er­a­tional pro­to­types will be de­liv­ered by three man­u­fac­tur­ers in the com­ing months and will be fully test­ed on the ring. Al­though the 300 mA op­tion has fi­nal­ly not been re­tained for the first phase of the ESRF up­grade, the aim is now to val­i­date the new cav­i­ty de­sign for a pos­si­ble later in­crease in cur­rent.