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

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 journal › Article › Academic › peer-review

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Abstract

The radial correlation length L_r 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 L_r 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, L_r is found to be around 1 n 0.2 mm.

Original language	English
Article number	2054
Number of pages	2
Journal	Plasma and Fusion Research
Volume	15
DOIs	https://doi.org/10.1585/PFR.15.1202054
Publication status	Published - 6 Aug 2020

Keywords

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

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10.1585/PFR.15.1202054

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Smith, N., Nagasaki, K., Proll, J. H. E., Okada, H., Minami, T., Kado, S. I., Kobayashi, S., Ohshima, S., Konoshima, S., Mizuuchi, T., Nakamura, Y., Ishizawa, A., Tomita, T., Fukuda, T., & Kondo, Y. (2020). Measurement of radial correlation lengths of electron density fluctuations in heliotron J using O-mode reflectometry. Plasma and Fusion Research, 15, [2054]. https://doi.org/10.1585/PFR.15.1202054

@article{a6290bb2c2734623a6983c5ec1e623c7,

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

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.",

keywords = "Electron density fluctuation, Heliotron J, O-mode reflectometry, Radial correlation length, Turbulent transport",

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

year = "2020",

month = aug,

day = "6",

doi = "10.1585/PFR.15.1202054",

language = "English",

volume = "15",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

publisher = "Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",

}

Smith, N, Nagasaki, K, Proll, JHE, Okada, H, Minami, T, Kado, SI, Kobayashi, S, Ohshima, S, Konoshima, S, Mizuuchi, T, Nakamura, Y, Ishizawa, A, Tomita, T, Fukuda, T & Kondo, Y 2020, 'Measurement of radial correlation lengths of electron density fluctuations in heliotron J using O-mode reflectometry', Plasma and Fusion Research, vol. 15, 2054. https://doi.org/10.1585/PFR.15.1202054

TY - JOUR

T1 - Measurement of radial correlation lengths of electron density fluctuations in heliotron J using O-mode reflectometry

AU - Smith, Niels

AU - Nagasaki, Kazunobu

AU - Proll, Josefine H.E.

AU - Okada, Hiroyuki

AU - Minami, Takashi

AU - Kado, Shin Ichiro

AU - Kobayashi, Shinji

AU - Ohshima, Shinsuke

AU - Konoshima, Shigeru

AU - Mizuuchi, Tohru

AU - Nakamura, Yuji

AU - Ishizawa, Akihiro

AU - Tomita, Tsuyoshi

AU - Fukuda, Takeshi

AU - Kondo, Yasuto

PY - 2020/8/6

Y1 - 2020/8/6

N2 - 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.

AB - 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.

KW - Electron density fluctuation

KW - Heliotron J

KW - O-mode reflectometry

KW - Radial correlation length

KW - Turbulent transport

UR - http://www.scopus.com/inward/record.url?scp=85090268883&partnerID=8YFLogxK

U2 - 10.1585/PFR.15.1202054

DO - 10.1585/PFR.15.1202054

M3 - Article

AN - SCOPUS:85090268883

SN - 1880-6821

VL - 15

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

M1 - 2054

ER -

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

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