Calculation of the bootstrap current profile for the TJ-II stellarator

Details Calculation of the bootstrap current profile for the TJ-II stellarator Calculation of the bootstrap current profile for the TJ-II stellarator

2011-08-18

arxiv.org/abs/1108.3721v2

Plasma Phys. Control. Fusion 53, 115014 (2011)

Physics

Plasma Physics

Scientific paper

10.1088/0741-3335/53/11/115014

Calculations of the bootstrap current for the TJ-II stellarator are presented. DKES and NEO-MC codes are employed; the latter has allowed, for the first time, the precise computation of the bootstrap transport coefficient in the long mean free path regime of this device. The low error bars allow a precise convolution of the monoenergetic coefficients, which is confirmed by error analysis. The radial profile of the bootstrap current is presented for the first time for the 100_44_64 configuration of TJ-II for three different collisionality regimes. The bootstrap coefficient is then compared to that of other configurations of TJ-II regularly operated. The results show qualitative agreement with toroidal current measurements; precise comparison with real discharges is ongoing.

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