DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 334: Deuterium and carbon SOL flows in USN plasmas using toroidally symmetric CD4 injection | ||
| Name: | Mathias Groth ( |
Affiliation: | Lawrence Livermore National Laboratory |
| Research Area: | Integrated Modeling | Presentation time: | Requested | Co-Author(s): | G.D. Porter, and the integrated modeling and boundary physics groups |
| Description: | Validate UEDGE SOL model with cross-field drifts by measuring the deuterium and low-charge state carbon ion velocities in the main SOL/pedestal regions in well-characterized L-mode and ELMing H-mode plasmas | ||
| Experimental Approach/Plan: | Use upper single-null magnetic configurations to give reciprocating probe access to crown of the plasma, use CD4 puffing from lower outer plenum to enhance carbon emission in the crown for lower divertor tangential cameras;
1) L-mode density scan in forward and reversed BT configuration, 2) ELMing H-mode density scan in forward and reversed BT configuration | ||
| Background: | Anamalously 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. Our proposal extends the range of measurements to plasmas at higher density in both L-mode and H-mode confinement regimes. | ||
| Resource Requirements: | 2x1-day experiment in forward and reversed BT configurations, repeat discharges for additional diagnostic settings, density scan: attached to detached divertors | ||
| 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) High-n Balmer line analysis for divertor Te Image analysis CD, CI, CII, CIII, CIV (tangential TVs) CVI and CIV CER analysis | ||
| Other Requirements: | UEDGE analysis | ||
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