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The first experimental simulation of the tokamak divertor using a gaseous collector is presented. Significant results are as follows: (i) neutral gas at a pressure of a few militorr is sufficient to absorb the entire localized flux of plasma thermal energy and redistribute it over a wide area, (ii) elastic ion-neutral collisions constitute the main energy-absorbing process (at Te,i5 eV), and (iii) a large pressure difference between divertor and main plasma chamber is maintained by plasma pumping in the connecting channel.
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Hsu et al. (1982) studied this question.
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