Confined alpha particle diagnostic system using an energetic He0 beam for ITER

M. Sasao, K. Shinto, M. Isobe, M. Nishiura, O. Kaneko, M. Wada, C. I. Walker, S. Kitajima, A. Okamoto, H. Sugawara, S. Takeuchi, N. Tanaka, H. Aoyama, M. Kisaki

研究成果: Article査読

13 被引用数 (Scopus)


The beam neutralization system for measurement of the spatial and velocity distributions of alpha particles of ITER plasmas was studied. As forward angle detection against the beam injection direction is required for effective neutralization, arrangement of the measurement system using possible ports in ITER configuration is proposed. The count rate of neutralized alpha particles produced by the double charge exchange interaction with energetic He0 beam particles injected is estimated. The ratios of signal to neutron-induced noise are evaluated. When a He0 beam produced by autodetachment from a 1-1.5 MeV He- beam of 10 mA is injected, the signal to noise ratio becomes greater than 1 at ρ <0.4, even without beam modulation. Usage of a lock-in technique at the frequency of radio-frequency quadrapole accelerator will make measurement at the outer region possible.

ジャーナルReview of Scientific Instruments
出版ステータスPublished - 2006

ASJC Scopus subject areas

  • 器械工学


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