Electric biasing of the divertor tiles in compass-D |
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Authors: | P Helander S J Fielding R H Cohen D D Ryutov |
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Institution: | (1) EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, U.K.;(2) Lawrence Livermore National Laboratory, Livermore, USA |
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Abstract: | It has been suggested that by electrically biasing the divertor tiles in a tokamak, one could create a toroidally-asymmetric
potential structure in the scrape-off layer (SOL) plasma. The resultingE×B convective motion should increase the plasma transport in the SOL and thereby reduce the heat load on the divertor plates.
This paper describes plans for such experiments on COMPASS-D and preliminary theoretical modelling. The COMPASS-D divertor
target consists of 24 graphite tiled toroidal segments. The inner and outer strike point tiles on all these segments will
be insulated from each other, and cabling will be installed to allow for biasing of individual tiles in any combination. Theoretical
analysis suggests that the electrostatic potential perturbations caused by the biasing will be confined to the divertor region
below the X-point, and that substantial SOL broadening can be achieved by applying modest voltages. Aside from active control
of SOL transport, it is hoped that the biasing will be useful to probe other divertor and SOL physics issues.
Presented at the Workshop on the Role of Electric Fields in Plasma Confinement and Exhaust, Budapest, 18–19 June, 2000.
This work was jointly funded by the UK Department of Trade and Industry and Euratom, and was supported by US DoE under contract
W-7405-ENG-48 at LLNL. |
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