Verlag des Forschungszentrums Jülich

JUEL-2872
Maddison, Geoffrey P.; Reiter, Detlev
Recycling source terms for edge plasma fluid models and impact an convergence behaviour of the BRAAMS "B2" code
70 S., 1994



Abstract Predictive simulations of tokamak edge plasmas require the most authentic description of neutral particle recycling sources, not merely the most expedient numerically. Employing a prototypical ITER divertor arrangement under conditions of high recycling, trial calculations with the "B2" steady-state edge plasma transport code, plus varying approximations of recycling, reveal marked sensitivity of both results and its convergence behaviour to details of sources incorporated. Comprehensive EIRENE Monte Carlo resolution of recycling is implemented by full and so-called "short" intermediate cycles between the plasma fluid and statistical neutral particle models. As generally for coupled differencing and stochastic procedures, though, overall convergence properties become more difficult to assess. A pragmatic criterion for the "B2" /EIRENE code system is proposed to determine its success, proceeding from a stricter condition previously identified for one particular analytic approximation of recycling in "B2". Certain procedures are also inferred potentialiy to improve their convergence further.

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