DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 335: Deuterium and carbon SOL flows in LSN or USN ELM-suppressed H-mode plasmas | ||
| Name: | Mathias Groth ( |
Affiliation: | Lawrence Livermore National Laboratory |
| Research Area: | Boundary | Presentation time: | Not requested | Co-Author(s): | M.E. Fenstermacher, and the ELM Control, Integrated Modeling, and Boundary Physics groups |
| Description: | Measure the deuterium and low-charge state carbon ion velocities in the main SOL/pedestal regions in well-characterized ELM-suppressed H-mode plasmas | ||
| Experimental Approach/Plan: | Use lower single-null or upper single-null (preferred!) configurations that permit ELM-suppressed operation, use CD4 puffing from upper or lower outer plenum to enhance carbon emission in the crown for divertor tangential cameras | ||
| Background: | Anomalously large scrape-off layer flows have been measured in the main SOL at the crown of the plasma. These flows can significantly affect/determine divertor detachment and impurity migration from the main chamber to the divertor plates. Our previous measurements in low-density L-mode plasmas have shown that the carbon injected into the crown of the plasma gets entrained in the deuterium ion flow, reaching Mach speeds of up to 0.5 of the plasma sound speed. This proposal extends the range of plasmas to ELM-suppressed H-mode confinement regimes. | ||
| Resource Requirements: | 2x1/2-day experiment in forward and reversed BT configurations, repeat discharges for additional diagnostic settings; density scan, but stay in ELM-suppressed regime | ||
| Diagnostic Requirements: | Reciprocating probes at outer midplane and crown (x-point probe)
MDS spectrometer (tangential views) MDS spectrometer for Te measurements in inner divertor Tangential cameras (divertors, inner and outer midplane) Langmuir probes Filterscopes CER | ||
| Analysis Requirements: | Profiles of Jsat, ne, Te, and D+ v (RCPs, fixed probes)
Flow velocities of C1+, C2+ ions (MDS) Image analysis CD, CI, CII, CIII, CIV (tangential TVs) CVI and CIV CER analysis | ||
| Other Requirements: | UEDGE analysis | ||
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