ICRF mode conversion in three-ion species heating experiment and in flow drive experiment on the Alcator C-Mod tokamak
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epjconf_rfppc2017_03030.pdf
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Author(s)
Lin, Yijun
Wukitch, Stephen James
Edlund, Eric Matthias
Ennever, Paul Chappell
Hubbard, Amanda E
Porkolab, Miklos
Rice, John E
Wright, John C
Date Issued
October 2017
Journal
EPJ Web of Conferences
Publisher
EDP Sciences
Citation
Lin, Y. et al. “ICRF Mode Conversion in Three-Ion Species Heating Experiment and in Flow Drive Experiment on the Alcator C-Mod Tokamak.” Edited by J. Hillairet. EPJ Web of Conferences 157 (2017): 03030. © 2017 The Authors, published by EDP Sciences
Version
Final published version
Abstract
In recent three-ion species (majority D and H plus a trace level of 3 He) ICRF heating experiments on Alcator C-Mod, double mode conversion on both sides of the 3 He cyclotron resonance has been observed using the phase contrast imaging (PCI) system. The MC locations are used to estimate the species concentrations in the plasma. Simulation using TORIC shows that with the 3 He level < 1%, most RF power is absorbed by the 3 He ions and the process can generate energetic 3 He ions. In mode conversion (MC) flow drive experiment in D( 3 He) plasma at 8 T, MC waves were also monitored by PCI. The MC ion cyclotron wave (ICW) amplitude and wavenumber k R have been found to correlate with the flow drive force. The MC efficiency, wave-number k of the MC ICW and their dependence on plasma parameters like T e0 have been studied. Based on the experimental observation and numerical study of the dispersion solutions, a hypothesis of the flow drive mechanism has been proposed.
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1051/epjconf/201715703030
