Author: Popovic, M.
Paper Title Page
TUPFI068 High Power Tests of Alumina in High Pressure RF Cavities for Muon Ionization Cooling Channel 1508
 
  • L.M. Nash
    University of Chicago, Chicago, Illinois, USA
  • G. Flanagan, R.P. Johnson, F. Marhauser, J.H. Nipper
    Muons. Inc., USA
  • M.A. Leonova, A. Moretti, M. Popovic, A.V. Tollestrup, K. Yonehara
    Fermilab, Batavia, USA
  • Y. Torun
    IIT, Chicago, Illinois, USA
  
  It is im­por­tant to make a com­pact muon ion­iza­tion cool­ing chan­nel to in­crease the cool­ing ef­fi­ciency (muon sur­vival rate, cool­ing decre­ment, etc). A pro­posed scheme to re­duce the ra­dial size of RF cav­i­ties at a given res­o­nance fre­quency is to in­sert a di­elec­tric ma­te­r­ial into the RF cav­ity. In vac­uum cav­i­ties, how­ever, di­elec­tric ma­te­ri­als are ex­tremely sus­cep­ti­ble to break­down in high power con­di­tions. High-pres­sure hy­dro­gen gas has been shown to in­hibit break­down events in RF cav­i­ties in strong mag­netic fields. An ex­per­i­ment has been de­signed to test sur­face break­down of alu­mina in RF cav­i­ties. A struc­ture has been de­signed to max­i­mize the par­al­lel field par­al­lel to the sur­face while bring­ing the cav­ity into a de­sired fre­quency range (800-810MHz). Alu­mina is tested in this con­fig­u­ra­tion under high power con­di­tions. The ex­per­i­men­tal re­sult will be shown in this pre­sen­ta­tion.