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Electron thermal conductivity from heat wave propagation in Wendelstein 7-AS

Abstract

Heat wave propagation experiments have been carried out on the Wendelstein 7-AS stellarator. The deposition of electron cyclotron resonance heating power is highly localized in the plasma centre, so that power modulation produces heat waves which propagate away from the deposition volume. Radiometry of the electron cyclotron emission is used to measure the generated temperature perturbation. The propagation time delay of the temperature perturbation as a function of distance to the power deposition region is used to determine the electron thermal conductivity [chi][sub e]. This value is then compared with the value determined by global power balance. In contrast to sawtooth propagation experiments in tokamaks, it is found that the value of [chi][sub e] from heat wave propagation is comparable to that calculated by power balance. In addition, inward propagating waves were produced by choosing a power deposition region away from the plasma centre. Experiments were carried out at 70 GHz in the ordinary mode and at 140 GHz in the extraordinary mode. Variations of the modulation power amplitude have demonstrated that the inferred value of [chi][sub e] is independent of the amplitude of the induced temperature perturbations. (author). 29 refs, 11 figs, 5 tabs.
Authors:
Giannone, L.; Erckmann, V; Gasparino, U; Hartfuss, H J; Kuehner, G; Maassberg, H; Stroth, U; Tutter, M; [1]  W7-AS Team; ECRH Group IPF Stuttgart; Gyrotron Group KFK Karlsruhe
  1. Association Euratom-Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
Publication Date:
Nov 01, 1992
Product Type:
Journal Article
Reference Number:
AIX-24-017723; EDB-93-035292
Resource Relation:
Journal Name: Nuclear Fusion; (Austria); Journal Volume: 32:11
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; WENDELSTEIN-7 STELLARATOR; ECR HEATING; THERMAL CONDUCTIVITY; WAVE PROPAGATION; ELECTRON DENSITY; ELECTRON TEMPERATURE; EXPERIMENTAL DATA; HEAT FLUX; MEASURING METHODS; MODULATION; PLASMA DIAGNOSTICS; RADIOMETERS; TIME MEASUREMENT; CLOSED PLASMA DEVICES; DATA; HEATING; HIGH-FREQUENCY HEATING; INFORMATION; MEASURING INSTRUMENTS; NUMERICAL DATA; PHYSICAL PROPERTIES; PLASMA HEATING; RADIATION DETECTORS; STELLARATORS; THERMODYNAMIC PROPERTIES; THERMONUCLEAR DEVICES; 700330* - Plasma Kinetics, Transport, & Impurities- (1992-); 700350 - Plasma Production, Heating, Current Drive, & Interactions- (1992-)
OSTI ID:
7056501
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0029-5515; CODEN: NUFUAU
Submitting Site:
INIS
Size:
Pages: 1985-2000
Announcement Date:

Citation Formats

Giannone, L., Erckmann, V, Gasparino, U, Hartfuss, H J, Kuehner, G, Maassberg, H, Stroth, U, Tutter, M, W7-AS Team, ECRH Group IPF Stuttgart, and Gyrotron Group KFK Karlsruhe. Electron thermal conductivity from heat wave propagation in Wendelstein 7-AS. IAEA: N. p., 1992. Web. doi:10.1088/0029-5515/32/11/I10.
Giannone, L., Erckmann, V, Gasparino, U, Hartfuss, H J, Kuehner, G, Maassberg, H, Stroth, U, Tutter, M, W7-AS Team, ECRH Group IPF Stuttgart, & Gyrotron Group KFK Karlsruhe. Electron thermal conductivity from heat wave propagation in Wendelstein 7-AS. IAEA. doi:10.1088/0029-5515/32/11/I10.
Giannone, L., Erckmann, V, Gasparino, U, Hartfuss, H J, Kuehner, G, Maassberg, H, Stroth, U, Tutter, M, W7-AS Team, ECRH Group IPF Stuttgart, and Gyrotron Group KFK Karlsruhe. 1992. "Electron thermal conductivity from heat wave propagation in Wendelstein 7-AS." IAEA. doi:10.1088/0029-5515/32/11/I10. https://www.osti.gov/servlets/purl/10.1088/0029-5515/32/11/I10.
@misc{etde_7056501,
title = {Electron thermal conductivity from heat wave propagation in Wendelstein 7-AS}
author = {Giannone, L., Erckmann, V, Gasparino, U, Hartfuss, H J, Kuehner, G, Maassberg, H, Stroth, U, Tutter, M, W7-AS Team, ECRH Group IPF Stuttgart, and Gyrotron Group KFK Karlsruhe}
abstractNote = {Heat wave propagation experiments have been carried out on the Wendelstein 7-AS stellarator. The deposition of electron cyclotron resonance heating power is highly localized in the plasma centre, so that power modulation produces heat waves which propagate away from the deposition volume. Radiometry of the electron cyclotron emission is used to measure the generated temperature perturbation. The propagation time delay of the temperature perturbation as a function of distance to the power deposition region is used to determine the electron thermal conductivity [chi][sub e]. This value is then compared with the value determined by global power balance. In contrast to sawtooth propagation experiments in tokamaks, it is found that the value of [chi][sub e] from heat wave propagation is comparable to that calculated by power balance. In addition, inward propagating waves were produced by choosing a power deposition region away from the plasma centre. Experiments were carried out at 70 GHz in the ordinary mode and at 140 GHz in the extraordinary mode. Variations of the modulation power amplitude have demonstrated that the inferred value of [chi][sub e] is independent of the amplitude of the induced temperature perturbations. (author). 29 refs, 11 figs, 5 tabs.}
doi = {10.1088/0029-5515/32/11/I10}
journal = {Nuclear Fusion; (Austria)}
volume = {32:11}
journal type = {AC}
place = {IAEA}
year = {1992}
month = {Nov}
}