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Self-sustained magnetic islands

Abstract

Numerical simulations of a single magnetic island evolution are presented in the regime where the island width is smaller than an ion Larmor radius. It is shown that the island rotation is controlled by particle diffusion due to collisions or a background of microturbulence. As expected from the theory of a stationary island, there exist cases where linearly stable magnetic perturbation are nonlinearly self-sustained. This situation corresponds to large poloidal beta and temperature gradient. The drive is due to diamagnetic frequency effects. However, this situation is not generic, and islands can also decay. It is found that a magnetic island is self-sustained for a negative off-diagonal diffusion coefficient. This case occurs in a tokamak if the inward particle pinch is due to the temperature gradient. (author). 30 refs.
Authors:
Chatenet, J H; Luciani, J F; [1]  Garbet, X [2] 
  1. Ecole Polytechnique, 91 - Palaiseau (France)
  2. Association Euratom-CEA, Centre d`Etudes de Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee
Publication Date:
Jun 01, 1996
Product Type:
Technical Report
Report Number:
EUR-CEA-FC-1578
Reference Number:
SCA: 700340; PA: AIX-29:006190; EDB-98:030821; SN: 98001919587
Resource Relation:
Other Information: DN: 30 refs.; PBD: Jun 1996
Subject:
70 PLASMA PHYSICS AND FUSION; COMPUTERIZED SIMULATION; DIFFUSION; DISTURBANCES; MAGNETIC ISLANDS; PLASMA; ROTATION; TOKAMAK DEVICES; TURBULENCE
OSTI ID:
575988
Research Organizations:
Association Euratom-CEA, Centre d`Etudes de Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee
Country of Origin:
France
Language:
English
Other Identifying Numbers:
Other: ON: TI98611543; TRN: FR9700742006190
Availability:
INIS; OSTI as TI98611543
Submitting Site:
FRN
Size:
[31] p.
Announcement Date:

Citation Formats

Chatenet, J H, Luciani, J F, and Garbet, X. Self-sustained magnetic islands. France: N. p., 1996. Web.
Chatenet, J H, Luciani, J F, & Garbet, X. Self-sustained magnetic islands. France.
Chatenet, J H, Luciani, J F, and Garbet, X. 1996. "Self-sustained magnetic islands." France.
@misc{etde_575988,
title = {Self-sustained magnetic islands}
author = {Chatenet, J H, Luciani, J F, and Garbet, X}
abstractNote = {Numerical simulations of a single magnetic island evolution are presented in the regime where the island width is smaller than an ion Larmor radius. It is shown that the island rotation is controlled by particle diffusion due to collisions or a background of microturbulence. As expected from the theory of a stationary island, there exist cases where linearly stable magnetic perturbation are nonlinearly self-sustained. This situation corresponds to large poloidal beta and temperature gradient. The drive is due to diamagnetic frequency effects. However, this situation is not generic, and islands can also decay. It is found that a magnetic island is self-sustained for a negative off-diagonal diffusion coefficient. This case occurs in a tokamak if the inward particle pinch is due to the temperature gradient. (author). 30 refs.}
place = {France}
year = {1996}
month = {Jun}
}