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research article

Correlation of the tokamak H-mode density limit with ballooning stability at the separatrix

Eich, T.
•
Goldston, R. J.
•
Kallenbach, A.
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March 1, 2018
Nuclear Fusion

We show for JET and ASDEX Upgrade, based on Thomson-scattering measurements, a clear correlation of the density limit of the tokamak H-mode high-confinement regime with the approach to the ideal ballooning instability threshold at the periphery of the plasma. It is shown that the MHD ballooning parameter at the separatrix position alpha(sep) increases about linearly with the separatrix density normalized to Greenwald density, n(e,sep)/n(GW) for a wide range of discharge parameters in both devices. The observed operational space is found to reach at maximum n(e,sep)/n(GW) approximate to 0.4-0.5 at values for alpha(sep) approximate to 2-2.5, in the range of theoretical predictions for ballooning instability. This work supports the hypothesis that the H-mode density limit may be set by ballooning stability at the separatrix.

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Type
research article
DOI
10.1088/1741-4326/aaa340
Web of Science ID

WOS:000422829400001

Author(s)
Eich, T.
Goldston, R. J.
Kallenbach, A.
Sieglin, B.
Sun, H. J.
Abduallev, S.
Abhangi, M.
Abreu, P.
Afzal, M.
Aggarwal, K. M.
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Date Issued

2018-03-01

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

58

Issue

3

Article Number

034001

Subjects

Physics, Fluids & Plasmas

•

Physics

•

h-mode density limit

•

power width scaling

•

ballooning instability

•

sol decay lengths

•

high-beta

•

turbulence

•

transport

•

power

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
September 21, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/161436
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