Corrections to charge exchange spectroscopic measurements in TFTR due to energy-dependent excitation rates

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Description

The use of charge exchange spectrocopy to determine plasma rotation speeds and ion temperature is complicated by the energy dependence of the excitation cross sections. The Doppler-broadened spectral line shape is distorted by the relative velocity between the neutral hydrogen atoms of the injected beam and impurity ions. The asymmetric nature of the energy dependence of this cross section causes a non-motional shift of the line center and a non-thermal change in the line width. These effects vary with the angles between the beam direction, rotation velocity direction, and direction of the viewing sightline. When viewing two neutral beams at ... continued below

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Pages: 17

Creation Information

Howell, R.B.; Fonck, R.J.; Knize, R.J. & Jaehnig, K.P. August 1, 1988.

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Description

The use of charge exchange spectrocopy to determine plasma rotation speeds and ion temperature is complicated by the energy dependence of the excitation cross sections. The Doppler-broadened spectral line shape is distorted by the relative velocity between the neutral hydrogen atoms of the injected beam and impurity ions. The asymmetric nature of the energy dependence of this cross section causes a non-motional shift of the line center and a non-thermal change in the line width. These effects vary with the angles between the beam direction, rotation velocity direction, and direction of the viewing sightline. When viewing two neutral beams at different angles on TFTR, the two measurements of v/sub phi/(r) show discrepancies about 20 to 30% with each other. The calculation of the spectral intensity profiles, using the excitation rates available, overcorrects these discrepancies and indicates the need for better excitation coefficients. 10 refs., 5 figs.

Physical Description

Pages: 17

Notes

NTIS, PC A03/MF A01; 1.

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  • Other Information: Portions of this document are illegible in microfiche products

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  • Other: DE88015863
  • Report No.: PPPL-2539
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/6838276 | External Link
  • Office of Scientific & Technical Information Report Number: 6838276
  • Archival Resource Key: ark:/67531/metadc1183696

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Office of Scientific & Technical Information Technical Reports

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 1, 1988

Added to The UNT Digital Library

  • July 2, 2018, 10:52 p.m.

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  • Feb. 26, 2019, 9:28 p.m.

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Howell, R.B.; Fonck, R.J.; Knize, R.J. & Jaehnig, K.P. Corrections to charge exchange spectroscopic measurements in TFTR due to energy-dependent excitation rates, report, August 1, 1988; New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc1183696/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.