Measurements of C V flows from thermal charge-exchange excitation in divertor plasmas
Certain transitions of C IV (C{sup 3+}) from n=7 to n=6 ({approx}7226 {angstrom}) and from n=6 to n=5 ({approx}4660 {angstrom}) 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 (C{sup 4+}) 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].
- Sponsoring Organization:
- (US)
- DOE Contract Number:
- AC03-99ER54463; AC05-00OR22725; FG02-04ER53175
- OSTI ID:
- 40277880
- Journal Information:
- Physics of Plasmas, Vol. 8, Issue 10; Other Information: DOI: 10.1063/1.1395569; Othernumber: PHPAEN000008000010004386000001; 004110PHP; PBD: Oct 2001; ISSN 1070-664X
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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