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Characteristics of Beam Attenuation in the High Temperature Plasma with High-Z Discharge in LHD
katsunori Ikeda,K. Tsumori,K. Nagaoka,M. Osakabe,O. Kaneko,S. Morita,Y. Oka,Y. Takeiri 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Behavior in attenuation of a high-energy neutral beam has been investigated by visible spectroscopy in the Large Helical Device (LHD). The measurement system consists of optical fibers, a spectrometer and an ICCD detector. A spectrum of beam emission is clearly observed by the Doppler effect. In order to increase the ion-heating power, we have adopted a high-Z discharge with argon gas. An ion temperature of 13.5 keV ± 2 keV is achieved by the injection of a neutral beam power of 10.5 MW. We have observed the behavior of the neutral beam emission in the high-temperature plasma. The intensity of the beam emission in the argon discharge is lower than that in the hydrogen discharge when the ion temperature increases. After the maximum ion temperature, the intensity of the beam emission increases as the electron density increases. This behavior is similar to the hydrogen discharge. It is indicated that the particle configuration of the plasma has changed. This result will contribute to the monitoring of the neutral beam absorption in fusion plasma.