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Abstract

In the JET tokamak, the perpendicular velocity distribution function of minority ICRF-heated protons in the MeV energy range is inferred from neutral particle analyzer (NPA) measurements of the emitted hydrogen flux, integrated along a vertical line-of-sight through the plasma centre. In particular, the best-fit perpendicular tail temperature of the inferred distribution can be determined with good accuracy. A relation is established between the measured quantity and the perpendicular tail temperature of the heated protons at the position of maximum ion cyclotron range of frequencies (ICRF) power deposition.
Results validate the model of impurity-induced neutralization of MeV protons developed to interpret NPA flux measurements giving access to a fundamental property of the high energy minority proton energy distribution, which plays a crucial role in theories of sawtooth stabilization.

Additional information

Authors: MCCLEMENTS K G, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB);DENDY R O, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB);GONDHALEKAR A, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Article: UKAEA FUS 338 EN (1996) 10pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon, OX14 3DB (GB)
Record Number: 199611494 / Last updated on: 1997-01-16
Category: PUBLICATION
Original language: en
Available languages: en