UEDGE simulations of helium plasma discharges on PISCES and NAGDIS-II
Abstract
In recent years, it was found that divertor plasma simulators like NAGDIS-II and PISCES exhibit many features similar to that found in edge plasmas of large fusion devices like tokamaks. Therefore, taking into account the rather simple geometry, stationary operational conditions, and relatively small scale of experiments, divertor simulators are considered to be a useful test bed for verification of different plasma physics models, in parallel with or even before applying these models to tokamaks. The edge plasma physics code UEDGE has been modified to simulate the hydrogen-helium-impurity mixture plasma in cylindrical geometry. The fast intermittent blobby non-diffusive cross-field transport, which was observed in PISCES and NAGDIS, is modeled in UEDGE as cross-field velocity Vconv directed to the wall. Along with plasma diffusivities, the 2D profile of Vconv is adjusted to match experimental probe measurements. We present simulation results for attached and detached helium plasmas. The synergistic effects caused by different phenomena in linear-machine plasmas such as intermittent non-diffusive transport, fast electrons, ion-electron recombination, MAR, and radiation opacity are discussed. Work supported by DoE grant DE-FG02-04ER54739.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- November 2004
- Bibcode:
- 2004APS..DPPPP1061P