Measurement of radial correlation lengths of electron density fluctuations in heliotron J using O-mode reflectometry

Niels Smith (Corresponding author), Kazunobu Nagasaki, Josefine H.E. Proll, Hiroyuki Okada, Takashi Minami, Shin Ichiro Kado, Shinji Kobayashi, Shinsuke Ohshima, Shigeru Konoshima, Tohru Mizuuchi, Yuji Nakamura, Akihiro Ishizawa, Tsuyoshi Tomita, Takeshi Fukuda, Yasuto Kondo

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The radial correlation length Lr of electron density fluctuations has been measured using a two-channel Omode reflectometer system in the helical-axis fusion plasma experimental device Heliotron J. The experimental results show that Lr is around 1.4 n 0.7mm in three different magnetic field bumpiness configurations (i.e. low, medium and high) for the low-density electron cyclotron heating (ECH) discharges. In high-density neutral beam injection (NBI) discharges with HIGP and pellet injection, Lr is found to be around 1 n 0.2 mm.

Original languageEnglish
Article number2054
Number of pages2
JournalPlasma and Fusion Research
Volume15
DOIs
Publication statusPublished - 6 Aug 2020

Keywords

  • Electron density fluctuation
  • Heliotron J
  • O-mode reflectometry
  • Radial correlation length
  • Turbulent transport

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