Soft X-Ray Spectrum Measurement of the Ultralong Discharge in the TRIAM-1M Tokamak

概要

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In order to evaluate the electron temperature and the effective charge number ($Z_{\text{eff}}$) 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 $Z_{\text{eff}}$ value of about 2 during the long-term discharge. It was found that the impurities observed in the spectrum were $K_{\alpha}$-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.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
1989-08-20