Plasma and Fusion Research

Volume 18, 2402065 (2023)

Regular Articles

Wave Absorption Profile during ICRF Heating in Mixed Plasma in Large Helical Device
Hiroshi KASAHARA, Tetsuo SEKI, Kenji SAITO, Dimitry MOSEEV1), Naoto TSUJII2), Goro NOMURA and Motonari KANDA
National Institute for Fusion Science, Toki 509-5292, Japan
1)
Max-planck Institute for Plasma Physics, Greifswald, 17491, Germany
2)
University of Tokyo, Kashiwa 277-0882, Japan
(Received 16 January 2023 / Accepted 26 June 2023 / Published 10 August 2023)

Abstract

A minority ion ratio in fast wave heating for the ion cyclotron range of frequencies affects plasma heating mechanisms and mode conversion ratios to short waves in a mixed plasma. The mode conversion region and these wave absorption profiles are functions of minority ion ratio, and direct wave absorption by electrons increases when the minority ion ratio exceeds about 6% in a simple two-dimensional wave absorption calculation with a single toroidal mode. At the minority ion ratio of 10%, the amount of absorption by electrons is comparable to that by ions. We find a significant relationship between the minority ion ratio and the wave absorption profile, exceeding the minority ion ratio of 10% for wave absorption to electrons.

Keywords

fast wave, short-wavelength, minority ion ratio, wave calculation

DOI: 10.1585/pfr.18.2402065

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