Measurements of C V flows from thermal charge-exchange excitation in divertor plasmas

B. Zaniol, R.C. Isler, N.H. Brooks, W.P. West, R.E. Olson

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Abstract

Certain transitions of C IV (C3+) from n=7 to n=6 (≈7226 Å) and from n=6 to n=5 (≈=4660 Å) sometimes appear much brighter in tokamak divertors than expected for electron-impact excitation from the ground state. This situation occurs because of charge exchange between C V (C4+) and recycling thermal deuterium atoms in the n=2 level. As a result, it is possible to extend parallel flow measurements of carbon, which have previously been performed on C II-C IV ions using Doppler shift spectroscopy, to include flows of the He-like C V ions. The work described here includes modeling of the spectral features, correlation of state populations with classical Monte Carlo trajectory (CTMC) predictions, and applications to flow measurements in the DIII-D divertor [Plasma Physics Controlled Nuclear Fusion Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159; Proceedings of the 18th IEEE/NPSS Symposium on Fusion Engineering, Albuquerque (Institute of Electrical and Electronic Engineers, Piscataway, 1999), p. 515]. © 2001 American Institute of Physics.
Original languageEnglish
Pages (from-to)4386 - 4389
Number of pages4
JournalPhysics of Plasmas
Volume8
Issue number10
DOIs
Publication statusPublished - Oct 2001
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Zaniol, B., Isler, R. C., Brooks, N. H., West, W. P., & Olson, R. E. (2001). Measurements of C V flows from thermal charge-exchange excitation in divertor plasmas. Physics of Plasmas, 8(10), 4386 - 4389. https://doi.org/10.1063/1.1395569