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Sawtooth crashes at high beta on JET

Abstract

The sawtooth crashes on JET display features which depend on beta. The main observation is a transient bulging of flux surfaces (duration inferior to 30 microsec.), which is predominantly on the low field side and extends to larger radii as beta increases. This phenomenon reaches the plasma boundary when beta{sub N} exceeds 0.5 and in these cases is followed by an ELM within 50 microsec. These sawtooth/ELM events limit plasma performance. Modelling of mode coupling shows qualitative agreement between observations of the structure of the sawtooth precursor and the calculated internal kink mode at high beta. (authors). 6 refs., 5 figs.
Authors:
Alper, B; Huysmans, G T.A.; Sips, A C.C.; [1]  Nave, M F.F. [2] 
  1. Commission of the European Communities, Abingdon (United Kingdom). JET Joint Undertaking
  2. Universidade Tecnica, Lisbon (Portugal). Inst. Superior Tecnico
Publication Date:
Jul 01, 1994
Product Type:
Conference
Report Number:
JET-P-94-29; CONF-9406270-
Reference Number:
SCA: 700340; PA: AIX-28:032701; EDB-97:058929; SN: 97001766274
Resource Relation:
Conference: 21. EPS conference on controlled fusion and plasma physics, Montpellier (France), 27 Jun - 1 Jul 1994; Other Information: PBD: Jul 1994; Related Information: Is Part Of Controlled fusion and plasma physics; PB: 240 p.
Subject:
70 PLASMA PHYSICS AND FUSION; HIGH-BETA PLASMA; SAWTOOTH OSCILLATIONS; BETA RATIO; EDGE LOCALIZED MODES; JET TOKAMAK; KINK INSTABILITY; PLASMA PRESSURE; PLASMA SIMULATION
OSTI ID:
456194
Research Organizations:
Commission of the European Communities, Abingdon (United Kingdom). JET Joint Undertaking
Country of Origin:
France
Language:
English
Other Identifying Numbers:
Other: ON: DE97621358; TRN: FR9701770032701
Availability:
INIS; OSTI as DE97621358
Submitting Site:
FRN
Size:
pp. 115-120
Announcement Date:

Citation Formats

Alper, B, Huysmans, G T.A., Sips, A C.C., and Nave, M F.F. Sawtooth crashes at high beta on JET. France: N. p., 1994. Web.
Alper, B, Huysmans, G T.A., Sips, A C.C., & Nave, M F.F. Sawtooth crashes at high beta on JET. France.
Alper, B, Huysmans, G T.A., Sips, A C.C., and Nave, M F.F. 1994. "Sawtooth crashes at high beta on JET." France.
@misc{etde_456194,
title = {Sawtooth crashes at high beta on JET}
author = {Alper, B, Huysmans, G T.A., Sips, A C.C., and Nave, M F.F.}
abstractNote = {The sawtooth crashes on JET display features which depend on beta. The main observation is a transient bulging of flux surfaces (duration inferior to 30 microsec.), which is predominantly on the low field side and extends to larger radii as beta increases. This phenomenon reaches the plasma boundary when beta{sub N} exceeds 0.5 and in these cases is followed by an ELM within 50 microsec. These sawtooth/ELM events limit plasma performance. Modelling of mode coupling shows qualitative agreement between observations of the structure of the sawtooth precursor and the calculated internal kink mode at high beta. (authors). 6 refs., 5 figs.}
place = {France}
year = {1994}
month = {Jul}
}