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Development of a Heavy Ion Bearn Probe for Measuring Electrostatic Potential Profile and Its Fluctuation in LHD
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作者 TakeshiI DO Akihiro SHIMIZU +12 位作者 Masaki NISHIURA Haruhisa NAKANO Shinji KATO Shinsuke OHSHIMA Yasuo YOSHIMURA Shin KUBO Takashi SHIMOZUMA HiroeI GAMI Hiromi TAKAHASHI Kazuo TOI Fumitake WATANABE kazumichi narihara Ichihiro YAMADA 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第4期460-464,共5页
A heavy ion beam probe (HIBP) using a 3-MV tandem accelerator has been installed on large helical device (LHD). Electrostatic potential in core plasma can be measured under the toroidal magnetic field strength of ... A heavy ion beam probe (HIBP) using a 3-MV tandem accelerator has been installed on large helical device (LHD). Electrostatic potential in core plasma can be measured under the toroidal magnetic field strength of up to 3 T. By using the HIBP, the transition of potential profiles from electron-root to ion^root is observed in core plasmas during ramp-up of the electron density. Potential fluctuations are also measured electron cyclotron current drive (ECCD). Two kind of characteristic fluctuations are observed. One is a reversed-shear-induced Alfv^n eigenmode (RSAE), whose frequency varies during the evolution of the rotational transform profile, and the other is with a constant geodeisc acoustic mode (GAM) frequency. 展开更多
关键词 electrostatic potential measurement HIBP GAM RSAE
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Asphericalizing the Light Collection Mirror for the 200-Point Thomson Scattering Diagnostic Installed on the Large Helical Device
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作者 kazumichi narihara Hiroshi HAYASHI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2011年第4期415-419,共5页
Shown is a possibility to make the image of a laser beam over a distance of 2.5 m, formed by the spherical multi-segment mirror installed in LHD, twice sharper by suitably adjusting the inclination of each segment mir... Shown is a possibility to make the image of a laser beam over a distance of 2.5 m, formed by the spherical multi-segment mirror installed in LHD, twice sharper by suitably adjusting the inclination of each segment mirror, which is equivalent to making the mirror surface aspherical. This will further enhance the attractiveness of a mirror-based Thomson scattering system. 展开更多
关键词 Thomson scattering LHD aspherical mirror
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