DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 484: The unexplored SN/DN transition zone in the SOL | ||
| Name: | Jonathan G. Watkins ( |
Affiliation: | Sandia National Laboratories |
| Research Area: | Boundary | Presentation time: | Not requested | Co-Author(s): | Lasnier, Stangeby, Rudakov |
| Description: | explore the conditions in the near (SN) SOL around an unbalanced DN plasma | ||
| Experimental Approach/Plan: | |||
| Background: | The balanced DN has both x-points on the same flux surface. If the
magnetic balance is shifted slightly (-1<drsep<+1), the near SOL is SN while the secondary SOL is DN. The secondary SOL still has significant plasma density and temperature in this near balanced region. There are several interesting things that happen in this region of magnetic balance that strongly affect the core plasma. 1)The H mode power threshold varies strongly with drsep. Both DIII-D, ASDEX, as well as MAST have observed this in DN. In MAST the H mode can only be achieved in a narrow range around the balance point. 2) Strong changes in the ELM behavior and the core density have been observed to depend on the magnetic balance. The strongest changes occur in the transition region between +1 and -1 in the drsep parameter. The structure of this type of SOL has potentially important properties that have never been studied before. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | mid plane probe
xpt probe IRTV floor probes filterscopes visible cameras | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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