Abstract
The neutrals code DEGAS and the transport code SNAP were used to model recycling during steady state phases of Ohmic and neutral beam-heated discharges in TFTR. The flux of deuterium from the inner limiter is calculated to be 15–45 times the total D α emission rate, with ≈ 2/3 of the deuterium flux resulting from D + flow in the scrape off to the limiter, and ≈ 1/3 resulting from D° scattering off the limiter. The total D + ionization rate in the core plasma is 6–24 times the total D α emission rate, and is larger than the total neutral beam fueling rate. The D α emission rate, limiter flux, and core ionization rates scale approximately as the square of the volume averaged electron density.
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