Reflectometry for density fluctuation and profile measurements in TST-2

Takuma Yamada; Akira Ejiri; Yoshiyuki Shimada; Takuya Oosako; Jiro Tsujimura; Yuichi Takase; Yuuki Torii; Makoto Sasaki; Hiroshi Tojo; Tetsuya Masuda; Hideo Nuga; Nobuyuki Sumitomo; Soichiro Kainaga; Junichi Sugiyama

doi:10.1585/pfr.2.S1037

Reflectometry for density fluctuation and profile measurements in TST-2

Takuma Yamada, Akira Ejiri, Yoshiyuki Shimada, Takuya Oosako, Jiro Tsujimura, Yuichi Takase, Yuuki Torii, Makoto Sasaki, Hiroshi Tojo, Tetsuya Masuda, Hideo Nuga, Nobuyuki Sumitomo, Soichiro Kainaga, Junichi Sugiyama

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

A reflectometer in Ka-band was designed, constructed and applied to the TST-2 spherical tokamak in order to detect density fluctuations induced by the radio frequency (RF) heating wave, and to measure the density profile. The optics of the reflectometer consists of two concave mirrors to make a small microwave beam spot inside the plasma. Using Kirchhoff integration, the parameters of the optics were optimized to achieve a high throughput (i.e. the ratio of the received to the launched powers) in various measurement conditions. Using the reflectometer, the density fluctuations in the frequency range of RF were detected and the electric field excited by RF (21MHz/260 kW) was estimated to be about 1.3 kV/m.

Original language	English
Article number	S1037
Journal	Plasma and Fusion Research
Volume	2
DOIs	https://doi.org/10.1585/pfr.2.S1037
Publication status	Published - 2007

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/pfr.2.S1037

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title = "Reflectometry for density fluctuation and profile measurements in TST-2",

abstract = "A reflectometer in Ka-band was designed, constructed and applied to the TST-2 spherical tokamak in order to detect density fluctuations induced by the radio frequency (RF) heating wave, and to measure the density profile. The optics of the reflectometer consists of two concave mirrors to make a small microwave beam spot inside the plasma. Using Kirchhoff integration, the parameters of the optics were optimized to achieve a high throughput (i.e. the ratio of the received to the launched powers) in various measurement conditions. Using the reflectometer, the density fluctuations in the frequency range of RF were detected and the electric field excited by RF (21MHz/260 kW) was estimated to be about 1.3 kV/m.",

author = "Takuma Yamada and Akira Ejiri and Yoshiyuki Shimada and Takuya Oosako and Jiro Tsujimura and Yuichi Takase and Yuuki Torii and Makoto Sasaki and Hiroshi Tojo and Tetsuya Masuda and Hideo Nuga and Nobuyuki Sumitomo and Soichiro Kainaga and Junichi Sugiyama",

note = "Funding Information: This work was supported by JSPS under Grant-in-Aid for Scientific Research Nos. 17044002 and 16106013, and partially by MEXT, Japan under Grant-in-Aid for Specially-Promoted Research No. 16002005. Publisher Copyright: {\textcopyright} 2007 The Japan Society of Plasma Science and Nuclear Fusion Research.",

year = "2007",

doi = "10.1585/pfr.2.S1037",

language = "English",

volume = "2",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

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

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T1 - Reflectometry for density fluctuation and profile measurements in TST-2

AU - Yamada, Takuma

AU - Ejiri, Akira

AU - Shimada, Yoshiyuki

AU - Oosako, Takuya

AU - Tsujimura, Jiro

AU - Takase, Yuichi

AU - Torii, Yuuki

AU - Sasaki, Makoto

AU - Tojo, Hiroshi

AU - Masuda, Tetsuya

AU - Nuga, Hideo

AU - Sumitomo, Nobuyuki

AU - Kainaga, Soichiro

AU - Sugiyama, Junichi

N1 - Funding Information: This work was supported by JSPS under Grant-in-Aid for Scientific Research Nos. 17044002 and 16106013, and partially by MEXT, Japan under Grant-in-Aid for Specially-Promoted Research No. 16002005. Publisher Copyright: © 2007 The Japan Society of Plasma Science and Nuclear Fusion Research.

PY - 2007

Y1 - 2007

N2 - A reflectometer in Ka-band was designed, constructed and applied to the TST-2 spherical tokamak in order to detect density fluctuations induced by the radio frequency (RF) heating wave, and to measure the density profile. The optics of the reflectometer consists of two concave mirrors to make a small microwave beam spot inside the plasma. Using Kirchhoff integration, the parameters of the optics were optimized to achieve a high throughput (i.e. the ratio of the received to the launched powers) in various measurement conditions. Using the reflectometer, the density fluctuations in the frequency range of RF were detected and the electric field excited by RF (21MHz/260 kW) was estimated to be about 1.3 kV/m.

AB - A reflectometer in Ka-band was designed, constructed and applied to the TST-2 spherical tokamak in order to detect density fluctuations induced by the radio frequency (RF) heating wave, and to measure the density profile. The optics of the reflectometer consists of two concave mirrors to make a small microwave beam spot inside the plasma. Using Kirchhoff integration, the parameters of the optics were optimized to achieve a high throughput (i.e. the ratio of the received to the launched powers) in various measurement conditions. Using the reflectometer, the density fluctuations in the frequency range of RF were detected and the electric field excited by RF (21MHz/260 kW) was estimated to be about 1.3 kV/m.

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DO - 10.1585/pfr.2.S1037

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VL - 2

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

M1 - S1037

ER -

Reflectometry for density fluctuation and profile measurements in TST-2

Abstract

All Science Journal Classification (ASJC) codes

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