UEDGE Modeling of the Proposed Divertor CER Diagnostic in DIII-D
Abstract
To design divertors for future experiments we need detailed knowledge of ion fluxes in existing machines, for example by precisely validating 2-D fluid divertor/SOL codes, like UEDGE. A new charge exchange recombination (CER) diagnostic has been proposed for measuring plasma flow and ion temperature in the DIII-D divertor and SOL with cm resolution. To help determine the feasibility of this diagnostic, we used UEDGE to simulate the average values of density, velocity and temperature of minority species along possible CER beam paths. Because the active signal from intrinsic carbon is expected to be less than thermal noise, we examined the effect of injecting the low Z elements, lithium or boron, into the core as a source of the radiating species in the desired regions. UEDGE results are presented for the simulated density, velocity and temperature of fully stripped Li and B along three possible CER beam paths in typical discharges. Using these results, the amplitude of an active CER signal has been determined.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2003
- Bibcode:
- 2003APS..DPPKP1004W