DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 336: Effect of core plasma rotation of deuterium and carbon SOL flows | ||
| Name: | Mathias Groth ( |
Affiliation: | Lawrence Livermore National Laboratory |
| Research Area: | Boundary | Presentation time: | Not requested | Co-Author(s): | Boundary, integrated modeling, and rotation physics groups |
| Description: | Measure the deuterium and low-charge state carbon ion velocities in the main SOL/pedestal regions in unbalanced and balanced-beam H-mode plasmas | ||
| Experimental Approach/Plan: | Use upper single-null configurations to give reciprocating probe access to crown of the plasma, use CD4 puffing from upper or lower outer plenum to enhance carbon emission in the crown for divertor tangential cameras; change momentum input by NBI injection from co-current to balanced to counter-current | ||
| 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. One of the most pressing questions is how core rotation affects flows in SOL versus how SOL flows affect core rotation and the L-H threshold power. This proposal attempts to provide first SOL flow measurements in DIII-D in unbalanced and balanced H-mode plasmas. | ||
| Resource Requirements: | 1-day experiment in forward BT/IP configurations, repeat discharges for additional diagnostic settings | ||
| Diagnostic Requirements: | Reciprocating probes at outer midplane and crown (x-point probe)
MDS spectrometer (tangential views) Tangential cameras (divertors, inner and outer midplane) Langmuir probes Filterscopes CER | ||
| Analysis Requirements: | Profiles of Jsat, ne, Te, and flow (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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