Test results of 18 GHz ECR charge breeder for KEK–JAERI RNB facility

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  • S. C. Jeong
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • M. Oyaizu
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • E. Tojyo
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • H. Kawakami
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • H. Ishiyama
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • H. Miyatake
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • K. Enomoto
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • Y. Watanabe
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • I. Katayama
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • T. Nomura
    IPNS-KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • M. Matsuda
    JAERI, Shirakata-Shirane 2-4, Tokai, Ibaraki 319-1195, Japan
  • A. Osa
    JAERI, Shirakata-Shirane 2-4, Tokai, Ibaraki 319-1195, Japan
  • S. Ichikawa
    JAERI, Shirakata-Shirane 2-4, Tokai, Ibaraki 319-1195, Japan

Description

<jats:p>Some of the test results of KEK ECR charge breeder made for KEK–JAERI RNB facility are presented and discussed. The charge breeding efficiencies for singly charged ions of noble gases have been measured; typically 13.5% of Ar9+, 10.4% of Kr12+, and 6.8% of Xe20+ with a global efficiency of about 50%. By injecting pulsed Xe1+ ion beam into the charge breeder, the time necessary for charge breeding has been also measured and found to be about 60 ms for Xe21+ ions. As an effort to reduce the residual gas ions incidentally existing in the plasma chamber of the charge breeder a nonevaporable getter has been tested, and the preliminary results are discussed.</jats:p>

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