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Wada, M.

Paper Title Page
TUPLS096 Strongly Focused He+ Beam Source for Alpha Particle Measurement at ITER 1726
 
  • K. Shinto, S. Kitajima, A. O. Okamoto, M. Sasao
    Tohoku University, Sendai
  • Y. H. Hirano, S. Kiyama, H. S. Sakakita
    AIST, Tsukuba
  • O. Kaneko, M. Nishiura
    NIFS, Gifu
  • M. Wada
    Doshisha University, Graduate School of Engineering, Kyoto
 
  A He+ beam source for He0 beam probe for measurement of fusion produced alphas due to D-T nuclear reaction in a thermonuclear fusion plasma has been designed and constructed. The ion source consists of a 300 mm diameter and 280 mm length plasma chamber and a beam extraction system which has three concaved electrodes. Helium plasma is confined by line cusp magnetic fields produced by Sm-Co permanent magnets. The magnetic field strength near the extraction region is designed to be less than 20 gauss. Through the 100 mm diameter extraction area of the concaved electrodes 300 beamlets are formed with apertures of 4 mm. The focal length of the concaved electrodes is designed to be 750 mm. The beam quality of the extracted He+ beam will be measured by several beam diagnostic apparatuses. The total beam current, the beam profile and the beam emittance will be measured to design a proper alkali metal vapor cell for a He- beam production by a double charge exchange process and a beam transport line to the post accelerator up to MeV region. In the article, the details of the ion source and the beam diagnostic system will be described.