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H-Mode Power Threshold Studies on MAST

Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BZ, UK
*
Author to whom correspondence should be addressed.
The MAST Team, United Kingdon Atomic Energy Authority, Culham Centre for Fusion Energy, Abingdon, Oxon OX14 3DB, UK.
Plasma 2019, 2(3), 328-338; https://doi.org/10.3390/plasma2030024
Received: 30 April 2019 / Revised: 11 July 2019 / Accepted: 12 July 2019 / Published: 19 July 2019
(This article belongs to the Special Issue Magnetic Confinement Fusion)
Analysis of the L–H and H–L transition power thresholds (Pth) and pedestal parameters are presented for the mega ampere spherical tokamak (MAST). The dependencies of Pth on the average, core plasma electron density, X-point height, and plasma current are described. Increasing X-point distance from the divertor floor over 10–12 cm is found to increase Pth by a factor of three, while X-point heights greater than this have no further influence. The X-point height dependence of Pth is also observed to be sensitive to the plasma current. An Ip decrease from 0.77 MA to 0.65 MA, is observed to lower Pth by a factor of three across the X-point height scan and increases the maximum X-point height at which Pth stops increasing by 3 cm. Finally, a comparison of the experimental results with the predictions by the finite beta drift wave model is made, which provides a reasonable condition for the transition into and out of the H-mode. View Full-Text
Keywords: L–H transition; H-mode; Tokamak; magnetically confined fusion; pedestal L–H transition; H-mode; Tokamak; magnetically confined fusion; pedestal
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Andrew, Y.; Bähner, J.-P.; Battle, R.; Jirman, T. H-Mode Power Threshold Studies on MAST. Plasma 2019, 2, 328-338.

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