Soft x-ray spectrum measurement of the ultralong discharge in the triam-1m tokamak

Akihiro Nagao, Eriko Jotaki, Shin Ichi Moriyama, Kazuo Nakamura, Yukio Nakamura, Naoji Hiraki, Satoshi Itoh

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8 Citations (Scopus)


In order to evaluate the electron temperature and the effective charge number (Zeff) of the ultralong discharge by a lower hybrid current drive in the TRIAM-1M tokamak, the soft X-ray energy spectrum is measured by the pulse height analysis system. The accuracy of the electron temperatures determined by the soft X-ray spectrum measurements is confirmed by comparing with the temperature obtained by the Thomson scattering system for OH plasmas. We obtained a bulk electron temperature of about 1.5 keV and a Zeffvalue of about 2 during the long-term discharge. It was found that the impurities observed in the spectrum were Kα-lines of Fe, Cr and Ni originating from the stainless-steel limiter and they did not increase during the long-term discharge. Thus we obtained clean plasmas with relatively high temperature by a lower hybrid current drive.

Original languageEnglish
Pages (from-to)1486-1490
Number of pages5
JournalJapanese Journal of Applied Physics
Issue number8R
Publication statusPublished - Aug 1 1989

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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