2-D PSD Diagnostic System for the Pellet Trajectory in LHD Plasmas

Mitsuyasu HOSHINO; Ryuichi SAKAMOTO; Hiroshi YAMADA; Yasuhiko ITOH; Kohki KUMAGAI; Ryuhei KUMAZAWA; Tetsuo WATARI; the LHD Experimental Group

doi:10.1585/pfr.3.002

Letters

2-D PSD Diagnostic System for the Pellet Trajectory in LHD Plasmas

Mitsuyasu HOSHINO, Ryuichi SAKAMOTO, Hiroshi YAMADA, Yasuhiko ITOH, Kohki KUMAGAI, Ryuhei KUMAZAWA, Tetsuo WATARI, the LHD Experimental Group

Author information

Mitsuyasu HOSHINO
Department of Energy Engineering and Science, Nagoya University, Nagoya 464-8603, Japan
Ryuichi SAKAMOTO
National Institute for Fusion Science, Toki 509-5292, Japan
Hiroshi YAMADA
National Institute for Fusion Science, Toki 509-5292, Japan
The Graduate University for Advanced Studies, SOKENDAI, Hayama 240-0193, Japan
Yasuhiko ITOH
National Institute for Fusion Science, Toki 509-5292, Japan
Kohki KUMAGAI
The Graduate University for Advanced Studies, SOKENDAI, Hayama 240-0193, Japan
Ryuhei KUMAZAWA
National Institute for Fusion Science, Toki 509-5292, Japan
Tetsuo WATARI
National Institute for Fusion Science, Toki 509-5292, Japan
the LHD Experimental Group
National Institute for Fusion Science, Toki 509-5292, Japan

Keywords: fueling, solid hydrogen, ablation, pellet trajectory, position sensitive detector, rocket effect, Large Helical Device

JOURNAL FREE ACCESS

2008 Volume 3 Pages 002

DOI https://doi.org/10.1585/pfr.3.002

Details

Abstract

Ablation of a solid hydrogen pellet in hot plasmas of Large Helical Device (LHD) has been studied. A position sensitive detector (PSD) diagnostics has been newly installed to measure the trajectory of ablating pellets. 2-D diagnostics enables the measurement with high time (1 MHz) and spatial resolutions (80 μm). A 3-D pellet trajectory can be described by a combination of 2-D images and information of initial pellet direction and velocity. A deflection of the pellet trajectory in the neutral beam injection (NBI) heated plasmas of LHD has been observed. Means of improving the measurement accuracy of this system are also discussed.

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