Thomson Scattering Measurements on Ohmically Heated Plasmas in the JFT-2 Tokamak

Electron temperature and density profiles are measured by Thomson scattering of ruby laser light in a low-q DIVA plasma; the profiles are strongly affected by internal disruption. The effective electron conduction coefficients χep at the moment of internal disruption are calculated on the basis of the diffusion equation. – The average value of χep outside the q = 1 singular surface rD, 7.2 × 104cm2·s−1 is much larger than that expected for the base discharge, which implies that the internal disruption substantially enhances the thermal transport throughout the region rD

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“…A detailed description of the ruby laser scattering apparatus used in the present study is given in Ref. [4].…”

Section: Divamentioning

confidence: 99%

Electron heat conduction coefficient at internal disruption in low-q DIVA plasmas

Yamauchi¹,

Shoji²,

Funahashi³

et al. 1980

Nucl. Fusion

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Thomson Scattering Measurements in Non-Circular Tokamak TNT-A

Nagayama¹,

Sakuma²,

Toyama³

1982

Jpn. J. Appl. Phys.

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A highly-sensitive, low-noise Thomson scattering apparatus has been developed. Measurements of electron densities of less than 1×1018 m-3 were performed using GaAs(Cs) photomultipliers with a quantum efficiency of over 10%, a light guide system with a high transmittance and a 6 J ruby laser. Detecting the scattered light with longer wavelength than that of the ruby laser protects the signal from disturbance by the plasma light, especially by the Hα line. The time evolutions of the electron temperature and the density profiles of the elongated plasma in the non-circular tokamak TNT-A are presented in this paper.

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Thomson Scattering Apparatus for Simultaneous Six-Position Measurements in the JFT-2 Tokamak

Yamauchi¹,

Sano²,

Kawashima³

et al. 1982

Jpn. J. Appl. Phys.

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A Thomson scattering apparatus for measuring the electron temperature and density profiles of the JFT-2 plasma has been constructed. Measuring positions are determined by six fibers separated from each other by a distance of approximately 2 cm. The Littrow type spectrometer provides 48 wavelength elements with 57–250 Å. The 48-photo-multipliers are arranged on the output field of the fibers. Spatial profiles of T e and n e in the range 0.05–1.5 keV and 1013–1014cm-3 in the JFT-2 Tokamak have been obtained with only one discharge.

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Thomson Scattering Measurements on Ohmically Heated Plasmas in the JFT-2 Tokamak

Cited by 3 publications

References 1 publication

Electron heat conduction coefficient at internal disruption in low-q DIVA plasmas

Electron heat conduction coefficient at internal disruption in low-q DIVA plasmas

Thomson Scattering Measurements in Non-Circular Tokamak TNT-A

Thomson Scattering Apparatus for Simultaneous Six-Position Measurements in the JFT-2 Tokamak

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