Evaluation of measurement signal of heavy ion beam probe of energetic-particle driven geodesic acoustic modes

Makoto Sasaki, Kimitaka Itoh, Takeshi Ido, Akihiro Shimizu, Tatsuya Kobayashi, Hiroyuki Arakawa, Naohiro Kasuya, Akihide Fujisawa, Sanae I. Itoh

Research output: Contribution to journalArticlepeer-review

Abstract

In order to observe spatial profiles of energetic particle driven modes, measurement signal of Heavy Ion Beam Probe (HIBP) is formulated theoretically, focusing on effects of the fast ion density fluctuation and attenuation of the injected beam (line-integral effect). Obtained formula is applied to the density fluctuation measurement of energetic-particle driven geodesic acoustic modes (EGAMs). Intensity of the fluctuation obtained by the HIBP can be up-down asymmetric in the poloidal cross-section due to the effect of the fast ion density fluctuation, when the electron loss cross-section of HIBP due to fast ions is comparable to that due to electrons. A possibility to measure the fast ion density by HIBP is discussed, and the experimental guideline for the specification of the resonance which drives the EGAM is presented.

Original languageEnglish
Article number3403040
JournalPlasma and Fusion Research
Volume13
DOIs
Publication statusPublished - 2018

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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