Experimental investigation of marfes and the density limit in the ASDEX upgrade
- 1 August 1994
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 36 (8) , 1307-1325
- https://doi.org/10.1088/0741-3335/36/8/006
Abstract
In the ASDEX Upgrade, X-point marfe formation and its behaviour up to the density limit is investigated in gas-fuelled ohmically-heated single-null discharges over a wide range of parameters: Ip=0.6-1.2 MA, BTF=1.35-2.4 T, a plasma elongation of 1.6 and Zeffp and is in good agreement with the Greenwald density limit scaling. The resulting experimental Hugill limit is neRq95/BTF=2.8*1020) m-2 T-1. Reversal of the ion Del B drift direction away from the target has a detrimental effect on the density limit.Keywords
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