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Author(s):
A. Fujisawa, H. Iguchi, S. Lee, T.P. Crowley, Y. Hamada, H. Sanuki, K. Itoh, S. Kubo, H. Idei, T. Minami, K. Tanaka, K. Ida, S. Nishimura, S. Hidekuma, M. Kojima, C. Takahashi, S. Okamura and K. Matsuoka
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Title:
Direct Observation of Potential Profiles with a 200keV Heavy Ion Beam Probe and Evaluation of Loss Cone Structure in Toroidal Helical Plasmas on the Compact Helical System
Date of publication:
July 1996
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Key words:
Potential Profile, Electric Field Profile, Loss Cone Structure, Heliotoron/Torsatron Device, Heavy Ion Beam Probe
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Abstract:
This paper presents direct experimental observations of potentia1 profiles of a toroida1 helical plasma in the Compact Helical System, using a 200keV heavy ion beam probe. Electron cyclotron heated plasmas show a positive potential profile in a low density regime (bar{n}_e = 3 x 10^12 cm^-3), while neutral beam injection heated plasmas (bar{n}_e = 8 x 10^12 cm^-3) exhibit a negative potential profile. A loss cone structure evaluated from the observed potential is discussed to understand the behavior of high energy particle in a toroidal helical plasma.
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