Study on Proton Behavior in the JFT-2 Tokamak from Analyses of Charge-Exchanged Fast Atoms

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Abstract
Proton behavior in the JFT-2 hydrogen plasma under an 18 kG and 160 kA discharge was investigated from analyses on charge-exchanged atoms measured with a multi-channel neutral particle energy analyser. The radial profiles of the transferred power from electrons to protons, charge exchange energy loss, and stored energy in protons were determined from the experimental results. From these profiles, the radial distribution of energy conduction coefficient on protons was estimated experirnentally. The estimated coefficient of (5—8)×10 3 cm 2 sec -1 was found to have the same magnitude and radial dependence predicted from the neoclassical theory by Hinton et al .