Open AccessEnergy and pitch angle-resolved measurements of escaping helically trapped energetic ions at the small major radius side of the compact helical system
Author(s) -
M. Isobe,
D. S. Darrow,
Junichiro Kotani,
A. Shimizu,
C. Suzuki,
Y. Yoshimura,
T. Minami,
C. Takahashi,
K. Nagaoka,
S. Nishimura,
K. Toi,
K. Matsuoka,
A. Okamura
Publication year - 2003
Publication title -
review of scientific instruments
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.605
H-Index - 165
eISSN - 1089-7623
pISSN - 0034-6748
DOI - 10.1063/1.1538330
Subject(s) - scintillator , pitch angle , ion , radius , atomic physics , tokamak , physics , plasma , large helical device , beam (structure) , plasma diagnostics , optics , flux (metallurgy) , neutral beam injection , acceptance angle , materials science , nuclear physics , detector , computer security , quantum mechanics , geophysics , computer science , metallurgy
We have developed and installed a new, second escaping fast ion probe for the small major radius side of the compact helical system. This is a Tokamak Fusion Test Reactor type scintillator-based probe and is intended to detect unconfined helically trapped fast ions whose orbits largely deviate from magnetic flux surfaces. We observed a localized light spot on the scintillator screen in neutral beam-heated discharges and it was confirmed to be a true fast ion signal. The analysis suggests that the probe detects partially thermalized, pitch angle scattered beam ions
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