Berlin 2001 – scientific programme

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P: Plasmaphysik

P 8: Magnetic Confinement and Plasma Technology (Poster Session)

P 8.5: Poster

Monday, April 2, 2001, 12:30–15:00, AT2

The Power Balance in W7-AS Plasmas bounded with Divertor Modules by means of Calorimetry and Bolometry — •Franz Gadelmeier, Peter Grigull, and Louis Giannone — Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, D-85748 Garching

W7-AS is a 5-period modular stellarator. In the summer of 2000, W7-AS resumed operation with ten newly installed divertor modules, five up and five down. The time-integral thermal loading of individual target tiles, 17 CFC-tiles per module, is registered via thermocouples embedded in the tile backside (calorimetry). The radiated power outside the divertor module region is measured by means of a 32-channel bolometer array. During the first divertor-experiments emphasis was placed upon the power balance and to assess up-down and toroidal asymmetries.

The calorimetric measurements indicate ι-dependent asymmetries. The accountability (thermal load on divertor targets and radiative losses) amounts up to 50% of the input power. Beyond this, the accountability does not decrease with increasing ι in contrast to former limiter-bounded plasmas. Thus, in high ι discharges the present divertor modules warrants a better coverage of the plasma edge compared to the former limiter configuration.