Simultaneous measurement of plasma pressure anisotropy with a double-pass thomson scattering diagnostic system on the TST-2

TST-2 group

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have developed a double-pass Thomson scattering diagnostic system for the TST-2 spherical tokamak device. By measuring the first- and second-pass scattering signals simultaneously, we obtained the two directional pressures and we measured the pressure anisotropy (i.e., the ratio of the pressures) with an error of 5% - 10% for moderate density (≃ 2 × 10 19 m -3 ) plasmas. We observed 30% and 100% anisotropy at the center and edge of the Ohmic-heated plasmas, respectively. We propose a three-temperature Maxwellian model, in which the fitting is better than in the shifted-Maxwellian model. The estimated plasma current density was close to the averaged current density. The results suggest that the contribution of thermal electrons to a plasma current is large in Ohmic-heated plasmas.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPlasma and Fusion Research
Volume10
Issue number2015
DOIs
Publication statusPublished - Jan 1 2015

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plasma pressure
Thomson scattering
plasma currents
anisotropy
tokamak devices
current density
scattering
electrons
temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Simultaneous measurement of plasma pressure anisotropy with a double-pass thomson scattering diagnostic system on the TST-2. / TST-2 group.

In: Plasma and Fusion Research, Vol. 10, No. 2015, 01.01.2015, p. 1-6.

Research output: Contribution to journalArticle

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abstract = "We have developed a double-pass Thomson scattering diagnostic system for the TST-2 spherical tokamak device. By measuring the first- and second-pass scattering signals simultaneously, we obtained the two directional pressures and we measured the pressure anisotropy (i.e., the ratio of the pressures) with an error of 5{\%} - 10{\%} for moderate density (≃ 2 × 10 19 m -3 ) plasmas. We observed 30{\%} and 100{\%} anisotropy at the center and edge of the Ohmic-heated plasmas, respectively. We propose a three-temperature Maxwellian model, in which the fitting is better than in the shifted-Maxwellian model. The estimated plasma current density was close to the averaged current density. The results suggest that the contribution of thermal electrons to a plasma current is large in Ohmic-heated plasmas.",
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AU - TST-2 group

AU - Hiratsuka, Junichi

AU - Ejiri, Akira

AU - Hasegawa, Makoto

AU - Nagashima, Yoshihiko

AU - Nakamura, Keishun

AU - Takase, Yuichi

AU - Togashi, Hiro

AU - Tojo, Hiroshi

AU - Yamaguchi, Takashi

PY - 2015/1/1

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AB - We have developed a double-pass Thomson scattering diagnostic system for the TST-2 spherical tokamak device. By measuring the first- and second-pass scattering signals simultaneously, we obtained the two directional pressures and we measured the pressure anisotropy (i.e., the ratio of the pressures) with an error of 5% - 10% for moderate density (≃ 2 × 10 19 m -3 ) plasmas. We observed 30% and 100% anisotropy at the center and edge of the Ohmic-heated plasmas, respectively. We propose a three-temperature Maxwellian model, in which the fitting is better than in the shifted-Maxwellian model. The estimated plasma current density was close to the averaged current density. The results suggest that the contribution of thermal electrons to a plasma current is large in Ohmic-heated plasmas.

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