Measurement of End-Loss Ions Originated from Spontaneously Excited High Frequency Waves by Using an MCP Detector on GAMMA 10/PDX

• IZUMI Koki

  Plasma Research Center, University of Tsukuba

• IKEZOE Ryuya

  Research Institute for Applied Mechanics, Kyushu University

• ICHIMURA Makoto

  Plasma Research Center, University of Tsukuba

• HIRATA Mafumi

  Plasma Research Center, University of Tsukuba

• SAKAMOTO Mizuki

  Plasma Research Center, University of Tsukuba

• SUMIDA Shuhei

  Plasma Research Center, University of Tsukuba

• JANG Seowon

  Plasma Research Center, University of Tsukuba

• TANAKA Atsuto

  Plasma Research Center, University of Tsukuba

• KUBOTA Yushi

  Plasma Research Center, University of Tsukuba

• SEKINE Ryo

  Plasma Research Center, University of Tsukuba

• KAYANO Hiroki

  Plasma Research Center, University of Tsukuba

• NAKASHIMA Yousuke

  Plasma Research Center, University of Tsukuba

Abstract

Effective ICRF heating creates a high ion-temperature plasma with strong ion-temperature anisotropy in the GAMMA 10/PDX central cell, where several Alfvén-ion-cyclotron (AIC) waves are spontaneously excited. It is clearly measured with a microwave reflectometer installed in the central cell that waves with the difference frequencies of the AIC waves are excited in a core region. In addition, it has been observed with an end-loss high-energy ion detector that high-energy ions of over 6 keV are axially transported along the magnetic field lines with the same frequencies as the difference frequencies of the AIC waves. In this study, in order to understand the related wave-particle interaction, another end-loss high-energy ion detector using a micro-channel plate has been developed. By changing the ion retarding grid voltage, which the new detector equips, it is found that an energy dependence exists in the loss mechanism; some frequencies that the axial transport includes disappear for high-energy ions of over 6 keV while they are significant for low-energy ions. In addition, by changing the radial position of the new detector, a radial localization of the axial transport to a core region, which is consistent with the profile of the difference frequencies waves, is indicated.

Journal

• Plasma and Fusion Research

  Plasma and Fusion Research 14 (0), 2402033-2402033, 2019-02-12

  The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

• GAMMA 10/PDX
• high-energy ion
• Alfvén-ion-cyclotron wave
• low-frequency wave
• wave-particle interaction

Details

• CRID: 1390845713061101056
• NII Article ID: 130007633131
• NII Book ID: AA12346675
• DOI: 10.1585/pfr.14.2402033
• ISSN: 18806821
• HANDLE: 2241/00157940
• Web Site: https://tsukuba.repo.nii.ac.jp/records/52521
• Web Site: https://www.jstage.jst.go.jp/article/pfr/14/0/14_2402033/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed