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

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Description

A new spectroscopic diagnostic on the National Spherical Torus Experiment (NSTX) measures the velocity distribution of ions in the plasma edge with both poloidal and toroidal views. An anisotropic ion temperature is measured during the presence of high power HHFW RF heating in He plasmas, with the poloidal T(sub)i roughly twice the toroidal T(sub)i. Moreover, the measured spectral distribution suggests that two populations have temperatures of 500 eV and 50 eV with rotation velocities of -50 km/s and -10 km/s, respectively. This bi-modal distribution is observed in both the toroidal and poloidal views (in both He II and C III ... continued below

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2.6 MB pages

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Biewer, T. M.; Bell, R. E.; Darrow, D. S.; Phillips, C. K. & Wilson, J. R. May 19, 2003.

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Description

A new spectroscopic diagnostic on the National Spherical Torus Experiment (NSTX) measures the velocity distribution of ions in the plasma edge with both poloidal and toroidal views. An anisotropic ion temperature is measured during the presence of high power HHFW RF heating in He plasmas, with the poloidal T(sub)i roughly twice the toroidal T(sub)i. Moreover, the measured spectral distribution suggests that two populations have temperatures of 500 eV and 50 eV with rotation velocities of -50 km/s and -10 km/s, respectively. This bi-modal distribution is observed in both the toroidal and poloidal views (in both He II and C III ions), and is well correlated with the period of RF power application to the plasma. The temperature of the edge ions is observed to increase with the applied RF power, which was scanned between 0 and 4.3MW. The ion heating mechanism from HHFW RF power has not yet been identified.

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2.6 MB pages

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INIS; OSTI as DE00814015

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  • Other Information: PBD: 19 May 2003

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  • Report No.: PPPL-3813
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/814015 | External Link
  • Office of Scientific & Technical Information Report Number: 814015
  • Archival Resource Key: ark:/67531/metadc736673

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  • May 19, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 10:05 p.m.

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Biewer, T. M.; Bell, R. E.; Darrow, D. S.; Phillips, C. K. & Wilson, J. R. Observations of Anisotropic Ion Temperature during RF Heating in the NSTX Edge, report, May 19, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc736673/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.