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Parasitic antenna loading measurements and a comparison between shielded and unshielded antenna excitation during Alfven wave heating in TCA

Technical Report:

Abstract

Experimental measurements are presented of the parasitic loading resulting from an RF Langmuir current which flows from an unshielded antenna to the scrape-off layer (SOL) during Alfven wave heating (AWH) in TCA. The measurements are of relevance to ICRH where RF currents drawn by electrostatic screens lead to parasitic loading and harmonic generation in the SOL. An experimental study of the plasma response to AWH after the installation of screens on the AWH antennas is also presented. The results demonstrate that the fault current and some of the parasitic phenomena observed in the SOL during AWH with unshielded antennas are eliminated by screens. The plasma bulk response however is dominated by a large density rise which is unaffected by screens. The implications of these results for AWH are also discussed. (author) 10 figs., 27 refs.
Authors:
Borg, G G; Joye, B [1] 
  1. Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Publication Date:
Oct 01, 1991
Product Type:
Technical Report
Report Number:
LRP-440/91
Reference Number:
SCA: 700350; PA: AIX-23:018285; SN: 92000661920
Resource Relation:
Other Information: PBD: Oct 1991
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; SHIELDING; PLASMA HEATING; ALFVEN WAVES; TCA TOKAMAK; ELECTRIC CURRENTS; ELECTRON-ION COLLISIONS; EXPERIMENTAL DATA; HARMONIC GENERATION; ICR HEATING; LANDAU DAMPING; MAGNETOACOUSTIC WAVES; PLASMA DENSITY; PLASMA SCRAPE-OFF LAYER; PLASMA WAVES; ROGOWSKI COIL; SCREENS; 700350; PLASMA PRODUCTION, HEATING, CURRENT DRIVE, AND INTERACTIONS
OSTI ID:
10118545
Research Organizations:
Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE92617411; TRN: CH9200050018285
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
CHN
Size:
42 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Borg, G G, and Joye, B. Parasitic antenna loading measurements and a comparison between shielded and unshielded antenna excitation during Alfven wave heating in TCA. Switzerland: N. p., 1991. Web.
Borg, G G, & Joye, B. Parasitic antenna loading measurements and a comparison between shielded and unshielded antenna excitation during Alfven wave heating in TCA. Switzerland.
Borg, G G, and Joye, B. 1991. "Parasitic antenna loading measurements and a comparison between shielded and unshielded antenna excitation during Alfven wave heating in TCA." Switzerland.
@misc{etde_10118545,
title = {Parasitic antenna loading measurements and a comparison between shielded and unshielded antenna excitation during Alfven wave heating in TCA}
author = {Borg, G G, and Joye, B}
abstractNote = {Experimental measurements are presented of the parasitic loading resulting from an RF Langmuir current which flows from an unshielded antenna to the scrape-off layer (SOL) during Alfven wave heating (AWH) in TCA. The measurements are of relevance to ICRH where RF currents drawn by electrostatic screens lead to parasitic loading and harmonic generation in the SOL. An experimental study of the plasma response to AWH after the installation of screens on the AWH antennas is also presented. The results demonstrate that the fault current and some of the parasitic phenomena observed in the SOL during AWH with unshielded antennas are eliminated by screens. The plasma bulk response however is dominated by a large density rise which is unaffected by screens. The implications of these results for AWH are also discussed. (author) 10 figs., 27 refs.}
place = {Switzerland}
year = {1991}
month = {Oct}
}