Initial Neutral Particle Analyzer Measurements of Ion Temperature in NSTX

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The Neutral Particle Analyzer (NPA) diagnostic on the National Spherical Torus Experiment (NSTX) utilizes a PPPL-designed E||B spectrometer which measures the energy spectra of minority H and bulk D species simultaneously with 39 energy channels per mass specie and a time resolution of 1 msec. The calibrated energy range is E = 0.5-150 keV and the energy resolution varies from (delta)E/E = 3-7% over the surface of the microchannel plate detector. The NPA measures thermal Maxwellian ion spectra to obtain line integrated ion temperatures, T{sub i}. For line integral electron densities below neL {approx} 3.5 x 10{sup 19} m{sup -2}, ... continued below

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621 Kilobytes pages

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Medley, S.S.; Bell, R.E.; Petrov, M.P.; Roquemore, A.L. & Suvorkin, and E.V. July 8, 2002.

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Description

The Neutral Particle Analyzer (NPA) diagnostic on the National Spherical Torus Experiment (NSTX) utilizes a PPPL-designed E||B spectrometer which measures the energy spectra of minority H and bulk D species simultaneously with 39 energy channels per mass specie and a time resolution of 1 msec. The calibrated energy range is E = 0.5-150 keV and the energy resolution varies from (delta)E/E = 3-7% over the surface of the microchannel plate detector. The NPA measures thermal Maxwellian ion spectra to obtain line integrated ion temperatures, T{sub i}. For line integral electron densities below neL {approx} 3.5 x 10{sup 19} m{sup -2}, good agreement is observed between the line integrated NPA T{sub i} and the central T{sub i}(0) measured by the spatially localized CHarge Exchange Recombination Spectroscopy (CHERS) diagnostic. However, with increasingly higher n{sub eL} the NPA T{sub i} falls below the central T{sub i}(0) measured by CHERS because the charge exchange neutral emissivity weights the line integrated NPA measurement outboard of the plasma core. An analytic neutral analysis code, DOUBLE, has been applied to the NPA data to correct for this effect and restore agreement with T{sub i}(0) measured by CHERS. A description of the NPA diagnostic on NSTX and initial ion temperature measurements along with an illustration of application of the DOUBLE code are presented.

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621 Kilobytes pages

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INIS; OSTI as DE00807249

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  • Other Information: PBD: 8 Jul 2002

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  • Report No.: PPPL-3718
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/807249 | External Link
  • Office of Scientific & Technical Information Report Number: 807249
  • Archival Resource Key: ark:/67531/metadc739403

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  • July 8, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 9:24 p.m.

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Medley, S.S.; Bell, R.E.; Petrov, M.P.; Roquemore, A.L. & Suvorkin, and E.V. Initial Neutral Particle Analyzer Measurements of Ion Temperature in NSTX, report, July 8, 2002; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc739403/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.