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ELM control during double-null Ohmic H-modes in TCV

Technical Report:

Abstract

Precise control of the shape and position of Double-Null divertor configurations in the TCV tokamak has been used to reliably trigger the transition from ELM-free to ELMy Ohmic H-Mode and back. Pre-programmed modulation of the magnetic axis height, with fixed shaping field, caused the plasma to evolve, during a single discharge, between Double-Null-Upper, Double-Null and Double-Null-Lower configurations, with both X-points remaining close to the last closed flux surface. The transition from ELM-free to ELMy and back again was observed to be synchronous with the configuration modifications. Using this method, several ELM-free and ELMy phases enabled reproducible disruption-free H-mode discharges in TCV lasting up to 1.5 seconds. The plasma density during a long-duration H-mode was directly controlled by feeding back onto the vertical height of the magnetic axis. (author) 4 figs., 18 refs.
Authors:
Dutch, M J; Hofmann, F; Duval, B P; Hirt, A; Joye, B; Lister, J B; Martin, Y; Nieswald, C; Pochelon, A; Weisen, H [1] 
  1. Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Publication Date:
Sep 01, 1994
Product Type:
Technical Report
Report Number:
LRP-501/94
Reference Number:
SCA: 700340; PA: AIX-26:009171; EDB-95:011464; SN: 95001302010
Resource Relation:
Other Information: PBD: Sep 1994
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIVERTORS; CONFIGURATION; EDGE LOCALIZED MODES; CONTROL; TCV TOKAMAK; H-MODE PLASMA CONFINEMENT; EXPERIMENTAL DATA; JOULE HEATING; MAGNETIC SURFACES; PLASMA DENSITY; 700340; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES
OSTI ID:
10103990
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: DE95611651; TRN: CH9400373009171
Availability:
OSTI; NTIS; INIS
Submitting Site:
CHN
Size:
11 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Dutch, M J, Hofmann, F, Duval, B P, Hirt, A, Joye, B, Lister, J B, Martin, Y, Nieswald, C, Pochelon, A, and Weisen, H. ELM control during double-null Ohmic H-modes in TCV. Switzerland: N. p., 1994. Web.
Dutch, M J, Hofmann, F, Duval, B P, Hirt, A, Joye, B, Lister, J B, Martin, Y, Nieswald, C, Pochelon, A, & Weisen, H. ELM control during double-null Ohmic H-modes in TCV. Switzerland.
Dutch, M J, Hofmann, F, Duval, B P, Hirt, A, Joye, B, Lister, J B, Martin, Y, Nieswald, C, Pochelon, A, and Weisen, H. 1994. "ELM control during double-null Ohmic H-modes in TCV." Switzerland.
@misc{etde_10103990,
title = {ELM control during double-null Ohmic H-modes in TCV}
author = {Dutch, M J, Hofmann, F, Duval, B P, Hirt, A, Joye, B, Lister, J B, Martin, Y, Nieswald, C, Pochelon, A, and Weisen, H}
abstractNote = {Precise control of the shape and position of Double-Null divertor configurations in the TCV tokamak has been used to reliably trigger the transition from ELM-free to ELMy Ohmic H-Mode and back. Pre-programmed modulation of the magnetic axis height, with fixed shaping field, caused the plasma to evolve, during a single discharge, between Double-Null-Upper, Double-Null and Double-Null-Lower configurations, with both X-points remaining close to the last closed flux surface. The transition from ELM-free to ELMy and back again was observed to be synchronous with the configuration modifications. Using this method, several ELM-free and ELMy phases enabled reproducible disruption-free H-mode discharges in TCV lasting up to 1.5 seconds. The plasma density during a long-duration H-mode was directly controlled by feeding back onto the vertical height of the magnetic axis. (author) 4 figs., 18 refs.}
place = {Switzerland}
year = {1994}
month = {Sep}
}