DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 419: Fluid SOL model validation for helium plasmas | ||
| Name: | Mathias Groth ( |
Affiliation: | Lawrence Livermore National Laboratory |
| Research Area: | Integrated Modeling | Presentation time: | Not requested | Co-Author(s): | G.D. Porter |
| Description: | Perform edge diagnostic-optimized helium plasmato measure the recycling and physical sputtering behavior at the divertor and main chamber. Detailed validation of UEDGE and SOLPS codes using experimental data. | ||
| Experimental Approach/Plan: | Characterization of helium plasma in L-mode and ELMy H-mode; density scan to detach inner and outer divertor; use strike point sweeps for higher resolution of divertor conditions:
1) L-mode density scan: w/o conversion of beams, these plasmas can be Ohmic 2) H-mode with converted beams or ICRF/ECH, collisionality scan | ||
| Background: | Helium plasmas pose a significantly simpler situation in terms of SOL fluid code validation than their hydrogenic counterpart: carbon chemical sputtering is not present in helium plasmas, and wall pumping is zero as helium completely recycles. Both the UEDGE and SOLPS codes can be run for helium plasmas. Since chemical sputtering and wall pumping is 'turned off' experimentally, some of the uncertainties in the boundary conditions of the simulations are removed. | ||
| Resource Requirements: | Convert DIII-D to operate in 95%+ helium. H-mode operation with beams also requires conversion to helium beams;
2-day experiment: detailed characterization of plasma conditions in the SOL/pedestal | ||
| Diagnostic Requirements: | Diagnostics setup for helium: CER, filterscopes, tangential TVs | ||
| Analysis Requirements: | SOLPS and UEDGE simulations | ||
| Other Requirements: | -- | ||
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