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Edge plasma control by RF electric field in Compact Helical System (CHS)

Technical Report:

Abstract

Reducing plasma heat flux on the material limiter and stabilizing fluctuations at the plasma boundary by the use of an RF ponderomotive potential barrier on the limiter (RF limiter) have been demonstrated in Compact Helical System (CHS) for ECH heated plasma. The RF current on a graphite limiter surface along magnetic field lines produces a ponderomotive potential barrier, which is large at the limiter edges. The high heat load on the limiter edges, which is measured using a infrared TV camera, has been shown to be reduced by an RF power of 1.4 kW at the frequency 10 MHz ({omega}{sub ci}<{omega}<<{omega}{sub ce}). Another remarkable effect of the ponderomotive potential barrier on the limiter that has been observed is the suppression of density fluctuations (<100 kHz) at the plasma boundary. (author).
Authors:
Shoji, T; Sagara, A; Noda, N [1] 
  1. and others
Publication Date:
May 01, 1992
Product Type:
Technical Report
Report Number:
PSC-18
Reference Number:
SCA: 700350; PA: JPN-92:011163; SN: 93000918568
Resource Relation:
Other Information: PBD: May 1992
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; STELLARATORS; EDGE LOCALIZED MODES; ECR HEATING; HOT PLASMA; PLASMA SCRAPE-OFF LAYER; RADIOWAVE RADIATION; STABILITY; LIMITERS; PONDEROMOTIVE FORCE; 700350; PLASMA PRODUCTION, HEATING, CURRENT DRIVE, AND INTERACTIONS
OSTI ID:
10111186
Research Organizations:
Nagoya Univ. (Japan). Plasma Science Center
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE93753242; TRN: JP9211163
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
19 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Shoji, T, Sagara, A, and Noda, N. Edge plasma control by RF electric field in Compact Helical System (CHS). Japan: N. p., 1992. Web.
Shoji, T, Sagara, A, & Noda, N. Edge plasma control by RF electric field in Compact Helical System (CHS). Japan.
Shoji, T, Sagara, A, and Noda, N. 1992. "Edge plasma control by RF electric field in Compact Helical System (CHS)." Japan.
@misc{etde_10111186,
title = {Edge plasma control by RF electric field in Compact Helical System (CHS)}
author = {Shoji, T, Sagara, A, and Noda, N}
abstractNote = {Reducing plasma heat flux on the material limiter and stabilizing fluctuations at the plasma boundary by the use of an RF ponderomotive potential barrier on the limiter (RF limiter) have been demonstrated in Compact Helical System (CHS) for ECH heated plasma. The RF current on a graphite limiter surface along magnetic field lines produces a ponderomotive potential barrier, which is large at the limiter edges. The high heat load on the limiter edges, which is measured using a infrared TV camera, has been shown to be reduced by an RF power of 1.4 kW at the frequency 10 MHz ({omega}{sub ci}<{omega}<<{omega}{sub ce}). Another remarkable effect of the ponderomotive potential barrier on the limiter that has been observed is the suppression of density fluctuations (<100 kHz) at the plasma boundary. (author).}
place = {Japan}
year = {1992}
month = {May}
}