Experimental measurements of ICRF minority-heated fast-ion distributions on Alcator C-Mod
Author(s)Sears, J.; Bader, Andrew; Granetz, Robert S.; Bonoli, Paul T.; Wukitch, Stephen James; Parker, R.; Hutchinson, Ian Horner; ... Show more Show less
Experimental measurements of ion cyclotron range of frequency minority-heated fast-ion distributions on Alcator C-Mod
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Ion cyclotron resonance heating is the primary auxiliary heating on the Alcator C-Mod tokamak and is commonly used on other devices, and is planned for use on ITER. The RF-power density on C-Mod is above 5 MW m−3 providing for a unique opportunity to study wave–particle effects in the high RF power per particle regime. Minority heating produces a highly energetic tail in the minority distribution function which is measured using a compact neutral particle analyser. In this paper, we present the measurements of the fast-ion spectrum between 200 and 2 MeV, compiled over an entire experimental campaign. We also estimate the effective tail temperatures for the fast-ion distribution. We find that the fast-ion distribution is less energetic and less dense with increasing electron density; is more energetic with increasing plasma current; and is more dense but has no measurable change in energy with increasing RF power. Some possible explanations for these findings are discussed.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Plasma Science and Fusion Center; Koch Institute for Integrative Cancer Research at MIT
Bader, A., R.S. Granetz, R.R. Parker, P.T. Bonoli, I.H. Hutchinson, J. Sears, and S.J. Wukitch. “Experimental measurements of ion cyclotron range of frequency minority-heated fast-ion distributions on Alcator C-Mod.” Nuclear Fusion 52, no. 9 (September 1, 2012): 094019.
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