Ion Doppler Spectroscopic Measurement with a Multi-channel PMT on Spheromak Plasmas

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  • Nagata Masayoshi
    Graduate School of Engineering, Himeji Institute of Technology
  • Uyama Tadao
    Graduate School of Engineering, Himeji Institute of Technology

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  • スフェロマックプラズマにおける多チャンネルＰＭＴを用いたイオンドップラー分光計測

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An ion Doppler spectrometer (IDS) using a compact 16 channel photomultiplier tube (PMT) has been developed and used to measure ion temperature and toroidal rotation speed on SSPX gun-spheromaks. Doppler broadening of OV spectral line shows higher ion temperature (-500 eV) as compared to the electron temperature, which indicates anomalous ion heating due to MHD relaxation. It has been also found that the plasma rotates with a speed of 60 km/s in the direction of E×B.

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