Author: Covo, M.K.
Paper Title Page
TUPOT008 Performance of the LBNL AECR-U with a TWTA 133
 
  • J.Y. Benitez, D. Leitner, C.M. Lyneis
    LBNL, Berkeley, California, USA
  • M.K. Covo
    LLNL, Livermore, California, USA
  
  The Ad­vanced Elec­tron Cy­clotron Res­o­nance - Up­grade ion source (AE­CR-U) at the Lawrence Berke­ley Na­tion­al Lab­o­ra­to­ry has suc­cess­ful­ly uti­lized dou­ble fre­quen­cy mi­crowave heat­ing (14.3 GHz and 10.4 GHz) for sev­er­al years [1]. Re­cent­ly a trav­el­ing wave tube am­pli­fi­er (TWTA), pro­vid­ing fre­quen­cies in the range of 10.75GHz-12.75GHz, was added as a sec­ondary heat­ing fre­quen­cy, re­plac­ing the pre­vi­ous 10.4 GHz Klystron. The TWTA opens the pos­si­bil­i­ty to ex­plore a wide range of sec­ondary fre­quen­cies and a study has been con­duct­ed to un­der­stand and op­ti­mize its cou­pling into the AE­CR-U. In par­tic­u­lar, the re­flect­ed power de­pen­dence on heat­ing fre­quen­cy has been mapped out with and with­out the pres­ence of plas­ma. A com­par­i­son is made to de­ter­mine how the pres­ence of plas­ma, con­fine­ment fields, and other source pa­ram­e­ters af­fect the re­flect­ed power and if and how the amount of re­flect­ed power can be cor­re­lat­ed to the source ion beam per­for­mance.
[1] Z. Q. Xie and C. M. Lyneis, Rev. Sci. Instrum. 66 (1995). 		 
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