Measurement of Radial Correlation Lengths of Electron Density Fluctuations in Heliotron J Using O-Mode Reflectometry

Niels SMITH; 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

doi:10.1585/pfr.15.1202054

Rapid Communications

Measurement of Radial Correlation Lengths of Electron Density Fluctuations in Heliotron J Using O-Mode Reflectometry

Niels SMITH, 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

Author information

Niels SMITH
Science and Technology of Nuclear Fusion, Department of Applied Physics, Eindhoven University of Technology (TU/e)
Kazunobu NAGASAKI
Institute of Advanced Energy, Kyoto University
Josefine H.E. PROLL
Science and Technology of Nuclear Fusion, Department of Applied Physics, Eindhoven University of Technology (TU/e)
Hiroyuki OKADA
Institute of Advanced Energy, Kyoto University
Takashi MINAMI
Institute of Advanced Energy, Kyoto University
Shin-ichiro KADO
Institute of Advanced Energy, Kyoto University
Shinji KOBAYASHI
Institute of Advanced Energy, Kyoto University
Shinsuke OHSHIMA
Institute of Advanced Energy, Kyoto University
Shigeru KONOSHIMA
Institute of Advanced Energy, Kyoto University
Tohru MIZUUCHI
Institute of Advanced Energy, Kyoto University
Yuji NAKAMURA
Graduate School of Energy Science, Kyoto University
Akihiro ISHIZAWA
Graduate School of Energy Science, Kyoto University
Tsuyoshi TOMITA
Graduate School of Energy Science, Kyoto University
Takeshi FUKUDA
Graduate School of Engineering, Osaka University
Yasuto KONDO
Graduate School of Engineering, Osaka University

Keywords: O-mode reflectometry, radial correlation length, electron density fluctuation, Heliotron J, turbulent transport

JOURNAL FREE ACCESS

2020 Volume 15 Pages 1202054

DOI https://doi.org/10.1585/pfr.15.1202054

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Abstract

The radial correlation length L_rof electron density fluctuations has been measured using a two-channel O-mode reflectometer system in the helical-axis fusion plasma experimental device Heliotron J. The experimental results show that L_ris around 1.4 ± 0.7 mm 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, L_ris found to be around 1 ± 0.2 mm.

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