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

S. C. Jeong, M. Oyaizu, E. Tojyo, H. Kawakami, H. Ishiyama, H. Miyatake, K. Enomoto, Y. Watanabe, I. Katayama, T. Nomura, M. Matsuda, A. Osa, S. Ichikawa

doi:10.1063/1.1699453

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

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

説明

<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>