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Title: The charge exchange recombination diagnostic system on the DIII-D tokamak

Abstract

The charge exchange recombination (CER) diagnostic system on the DIII-D tokamak is used to make spatially and temporally resolved measurements of the ion temperature and toroidal and poloidal rotation velocities. This is performed through visible spectroscopic measurements of the Doppler broadened and Doppler shifted HE II 468.6 nm, the CVI 529.1 nm, and the BV 494.5 nm spectral lines which have been excited by charge exchange recombination interactions between the fully stripped ions and the neutral atoms from the heating beams. The plasma viewing optics comprises 32 viewing chords spanning a typical plasma minor radius of 63 cm across the midplane, of which 15 spatial chords span 4.2 cm at the plasma edge just within the separatrix and provide a chord-to-chord spatial resolution of 0.3 cm. Fast camera readout electronics can provide a temporal resolution of 260 {mu}s per time slice, but the effective minimum integration time, at present, is 1 ms which is limited by the detected photon flux from the plasma and the decay times of the phosphors used on the multichannel plate image intensifiers. Significant changes in the edge plasma radial electric field at the L-H transition have been observed, as determined from the CER measurements, andmore » these results are being extensively compared to theories which consider the effects of sheared electric fields on plasma turbulence. 13 refs., 10 figs.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6152340
Report Number(s):
GA-A-20652; CONF-910968-47
ON: DE92003805
DOE Contract Number:  
AC03-89ER51114
Resource Type:
Conference
Resource Relation:
Conference: 14. IEEE symposium on fusion engineering, San Diego, CA (United States), 30 Sep - 3 Oct 1991
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DOUBLET-3 DEVICE; PLASMA DIAGNOSTICS; CHARGE EXCHANGE; IMAGE INTENSIFIERS; ION TEMPERATURE; OPTICAL SYSTEMS; RECOMBINATION; TEMPERATURE DISTRIBUTION; CLOSED PLASMA DEVICES; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; 700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)

Citation Formats

Gohil, P, Burrell, K H, Groebner, R J, Kim, J, Martin, W C, McKee, E L, and Seraydarian, R P. The charge exchange recombination diagnostic system on the DIII-D tokamak. United States: N. p., 1991. Web.
Gohil, P, Burrell, K H, Groebner, R J, Kim, J, Martin, W C, McKee, E L, & Seraydarian, R P. The charge exchange recombination diagnostic system on the DIII-D tokamak. United States.
Gohil, P, Burrell, K H, Groebner, R J, Kim, J, Martin, W C, McKee, E L, and Seraydarian, R P. 1991. "The charge exchange recombination diagnostic system on the DIII-D tokamak". United States. https://www.osti.gov/servlets/purl/6152340.
@article{osti_6152340,
title = {The charge exchange recombination diagnostic system on the DIII-D tokamak},
author = {Gohil, P and Burrell, K H and Groebner, R J and Kim, J and Martin, W C and McKee, E L and Seraydarian, R P},
abstractNote = {The charge exchange recombination (CER) diagnostic system on the DIII-D tokamak is used to make spatially and temporally resolved measurements of the ion temperature and toroidal and poloidal rotation velocities. This is performed through visible spectroscopic measurements of the Doppler broadened and Doppler shifted HE II 468.6 nm, the CVI 529.1 nm, and the BV 494.5 nm spectral lines which have been excited by charge exchange recombination interactions between the fully stripped ions and the neutral atoms from the heating beams. The plasma viewing optics comprises 32 viewing chords spanning a typical plasma minor radius of 63 cm across the midplane, of which 15 spatial chords span 4.2 cm at the plasma edge just within the separatrix and provide a chord-to-chord spatial resolution of 0.3 cm. Fast camera readout electronics can provide a temporal resolution of 260 {mu}s per time slice, but the effective minimum integration time, at present, is 1 ms which is limited by the detected photon flux from the plasma and the decay times of the phosphors used on the multichannel plate image intensifiers. Significant changes in the edge plasma radial electric field at the L-H transition have been observed, as determined from the CER measurements, and these results are being extensively compared to theories which consider the effects of sheared electric fields on plasma turbulence. 13 refs., 10 figs.},
doi = {},
url = {https://www.osti.gov/biblio/6152340}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Nov 01 00:00:00 EST 1991},
month = {Fri Nov 01 00:00:00 EST 1991}
}

Conference:
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