Observations of Anisotropic Ion Temperature in the NSTX Edge during RF Heating

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A new spectroscopic diagnostic with both toroidal and poloidal views has been implemented in the edge of the National Spherical Torus Experiment (NSTX). This edge rotation diagnostic (ERD) was designed to measure the velocity and temperature of ions. The intersection of the diagnostic sightlines with the intrinsic emission shell provides the localization of the measurement. There are 7 toroidally directed views and 6 poloidally directed views of the outboard plasma edge. The poloidal view is {approx}20 cm (toroidally) from the RF antenna, and the toroidal view is {approx}2 m away. The sightlines are nearly tangent to the flux surfaces. The ... continued below

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732 Kilobytes pages

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Biewer, T.M.; Bell, R.E.; Ryan, P.M. & Wilson, J.R. June 28, 2004.

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A new spectroscopic diagnostic with both toroidal and poloidal views has been implemented in the edge of the National Spherical Torus Experiment (NSTX). This edge rotation diagnostic (ERD) was designed to measure the velocity and temperature of ions. The intersection of the diagnostic sightlines with the intrinsic emission shell provides the localization of the measurement. There are 7 toroidally directed views and 6 poloidally directed views of the outboard plasma edge. The poloidal view is {approx}20 cm (toroidally) from the RF antenna, and the toroidal view is {approx}2 m away. The sightlines are nearly tangent to the flux surfaces. The C{sup 2+} triplet near 4651 {angstrom} and the He{sup +} line at 4685 {angstrom} are measured. In the results presented here, helium is the bulk, ''working'' ion of the discharge. The NSTX is a large spherical tokamak with a major radius of 0.85 m and a minor radius of 0.65 m. The outer walls and center-stack are lined with protective carbon tiles. Pulse lengths for these NSTX discharges are {approx} 600 ms, with an on-axis toroidal magnetic field of {approx} 0.3 T. The plasma current is 500 kA. The on-axis electron temperature and density are {le} 2 keV and {approx} 2 x 10{sup 19} m{sup -3}, respectively with {le} 4.3 MW of High Harmonic Fast Wave (HHFW) Radio Frequency (RF) auxiliary heating.

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732 Kilobytes pages

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INIS; OSTI as DE00828257

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  • Other Information: PBD: 28 Jun 2004

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  • Report No.: PPPL-3973
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/828257 | External Link
  • Office of Scientific & Technical Information Report Number: 828257
  • Archival Resource Key: ark:/67531/metadc781659

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  • June 28, 2004

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • June 10, 2016, 6:09 p.m.

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Biewer, T.M.; Bell, R.E.; Ryan, P.M. & Wilson, J.R. Observations of Anisotropic Ion Temperature in the NSTX Edge during RF Heating, report, June 28, 2004; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc781659/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.