Author: Borchard, P.
Paper Title Page
MOPAB342 Design, Fabrication, and Commissioning of the Mode Launchers for High Gradient C-Band Cavity Testing at LANL 1060
 
  • E.I. Simakov, J.E. Acosta, D. Gorelov, M.F. Kirshner, J.W. Lewellen
    LANL, Los Alamos, New Mexico, USA
  • P. Borchard
    Dymenso LLC, San Francisco, USA
  • M.E. Schneider
    MSU, East Lansing, Michigan, USA
  
  Funding: Los Alamos National Laboratory LDRD Program.
This poster will re­port on the de­sign, fab­ri­ca­tion, and op­er­a­tion sta­tus of the new high gra­di­ent C-band TM01 mode launch­ers for the high gra­di­ent C-band test stand at LANL. Mod­ern ap­pli­ca­tions re­quire ac­cel­er­a­tors with op­ti­mized cost of con­struc­tion and op­er­a­tion, nat­u­rally call­ing for high-gra­di­ent ac­cel­er­a­tion. At LANL we com­mis­sioned a test stand pow­ered by a 50 MW, 5.712 GHz Canon kly­stron. The test is ca­pa­ble of con­di­tion­ing sin­gle cell ac­cel­er­at­ing cav­i­ties for op­er­a­tion at sur­face elec­tric fields up to 300 MV/m. The rf field is cou­pled into the cav­ity from a WR187 wave­guide through a mode launcher that con­verts the fun­da­men­tal mode of the rec­tan­gu­lar wave­guide into the TM01 mode of the cir­cu­lar wave­guide. Sev­eral de­signs for mode launch­ers were con­sid­ered and the final de­sign was cho­sen based on a com­pro­mise be­tween the field en­hance­ments, band­width, and sim­plic­ity and cost of fab­ri­ca­tion. Four mode launch­ers were fab­ri­cated and cold-tested. Two mode launch­ers with the best trans­mis­sion char­ac­ter­is­tics were in­stalled and con­di­tioned to high power. The pre­sen­ta­tion will re­port achieved gra­di­ents, break­down prob­a­bil­i­ties, and other char­ac­ter­is­tics mea­sured dur­ing op­er­a­tion. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB342  
About • paper received ※ 19 May 2021       paper accepted ※ 25 May 2021       issue date ※ 19 August 2021  
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WEPAB329 LCLS-II Average Current Monitor 3443
 
  • P. Borchard, J.S. Hoh
    Dymenso LLC, San Francisco, USA
  
  The LCLS-II pro­ject at SLAC is a high power up­grade to the ex­ist­ing free-elec­tron laser fa­cil­ity. The LCLS-II Ac­cel­er­a­tor Sys­tem will in­clude a new 4 GeV con­tin­u­ous-wave su­per­con­duct­ing lin­ear ac­cel­er­a­tor in the first kilo­me­ter of the SLAC lin­ear ac­cel­er­a­tor tun­nel and sup­ple­ments the ex­ist­ing low power pulsed linac. Av­er­age Cur­rent Mon­i­tors (ACMs) are needed to pro­tect against ex­ces­sive beam power which might oth­er­wise cause dam­age to the beam dumps. The ACM cav­i­ties are pill­box-shaped stain­less steel RF cav­ity with two ra­dial probe ports with cou­plers, one ra­dial test port with a cou­pler, and a mech­a­nism for me­chan­i­cally fine-tun­ing the cav­ity res­o­nant fre­quency. The ACM RF cav­i­ties will be lo­cated at points of known or con­strained beam en­ergy and will mon­i­tor the beam cur­rent, a safety sys­tem will trip off the beam if the beam power ex­ceeds the al­lowed value.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB329  
About • paper received ※ 19 May 2021       paper accepted ※ 16 June 2021       issue date ※ 22 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)