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Hara, S.

Paper Title Page
MOPEA012 A Compact and High-Proton-Yield Microwave Ion Source for Proton Linac 85
 
  • T. Iga, S. Hara, T. Seki
    Hitachi, Ltd., Energy and Environmental System Laboratory, Hitachi-shi
  
 

A com­pact and high-pro­ton-yield 2.45 GHz mi­crowave ion source has been de­vel­oped and test­ed on an Acc­Sys Model PL-7 linac. The source that has an over­all di­am­e­ter of 115 mm uses per­ma­nent mag­nets and iron yokes. Mi­crowave power was fed to a plas­ma cham­ber with a dou­ble ridged waveg­uide via a coax­i­al cable. A pulsed hy­dro­gen ion beam of 45 mA was ex­tract­ed from a sin­gle 5 mm di­am­e­ter ex­trac­tion aper­ture with a pro­ton frac­tion of >90 % at 30 keV and a hy­dro­gen gas flow rate of 1 sccm. A 7-MeV pro­ton cur­rent out of the linac with the source reached up to 16 mA­peak, which ex­ceeds its de­sign value of 15 mA­peak. Ex­cel­lent sta­bil­i­ty of no more than 1.5 % in both the ion source ex­trac­tion cur­rent and the linac out­put cur­rent was also demon­strat­ed in an 8-hour op­er­a­tion test.