Comparison of dispersion model of magneto-acoustic cyclotron instability with experimental observation of3He ion cyclotron emission on JT-60U

Shuhei Sumida, Kouji Shinohara, Ryuya Ikezoe, Makoto Ichimura, Mizuki Sakamoto, Mafumi Hirata, Shunsuke Ide

Research output: Contribution to journalArticle

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Abstract

The Magneto-acoustic Cyclotron Instability (MCI) is a possible emission mechanism for Ion Cyclotron Emissions (ICEs). A dispersion model of the MCI driven by a drifting-ring-type ion velocity distribution has been proposed. In this study, the model was compared with the experimental observations of 3He ICEs [ICEs(3He)] on JT-60U. For this purpose, at first, velocity distributions of deuterium–deuterium fusion produced fast 3He ions at the time of an appearance of the ICE(3He) were evaluated by using a fast ion orbit following code under a realistic condition. The calculated distribution at the edge of the plasma on the midplane on the low field side is shown to have an inverted population and strong anisotropy. This distribution can be reasonably approximated by the drifting-ring-type distribution. Next, dispersions of the MCIs driven by the drifting-ring-type distribution were compared with those of observed ICEs(3He). The comparison shows that toroidal wavenumbers and frequencies of the calculated MCIs agree with those of the observed ICEs(3He).

Original languageEnglish
Article number124501
Journaljournal of the physical society of japan
Volume86
Issue number12
DOIs
Publication statusPublished - Dec 15 2017

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cyclotrons
acoustics
ions
rings
velocity distribution
ion emission
fusion
orbits
anisotropy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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Comparison of dispersion model of magneto-acoustic cyclotron instability with experimental observation of3He ion cyclotron emission on JT-60U. / Sumida, Shuhei; Shinohara, Kouji; Ikezoe, Ryuya; Ichimura, Makoto; Sakamoto, Mizuki; Hirata, Mafumi; Ide, Shunsuke.

In: journal of the physical society of japan, Vol. 86, No. 12, 124501, 15.12.2017.

Research output: Contribution to journalArticle

Sumida, Shuhei ; Shinohara, Kouji ; Ikezoe, Ryuya ; Ichimura, Makoto ; Sakamoto, Mizuki ; Hirata, Mafumi ; Ide, Shunsuke. / Comparison of dispersion model of magneto-acoustic cyclotron instability with experimental observation of3He ion cyclotron emission on JT-60U. In: journal of the physical society of japan. 2017 ; Vol. 86, No. 12.
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