DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 64: Sustained Monster Sawteeth | ||
| Name: | C. Craig Petty ( |
Affiliation: | General Atomics |
| Research Area: | Energetic Particles | Presentation time: | Not requested | Co-Author(s): | R. I. Pinsker, W. W. Heidbrink |
| Description: | Sustain monster sawteeth for > 2 s by using a combination of ICRF for sawtooth stabilization and off-axis ECCD for q(0) control. | ||
| Experimental Approach/Plan: | (1) Create monster sawteeth using fast wave absorption on beam ions. This could be done at 60 MHz in low density plasmas. (2) Apply off-axis co ECCD outside the q=1 surface (around r/a=0.3-0.4) to prevent q(0) from dropping to 0.8. Try a few different locations and power scans. (3) If any fast wave power is not being used for beam ion heating, try counter FWCD to observe effect on q(0) (not expected to work as well as off-axis ECCD). | ||
| Background: | Monster sawteeth crash when q(0) drops to a critical value. Using off-axis ECCD to halt the decreasing evolution of q(0) should allow monster sawteeth to be sustained indefinitely. | ||
| Resource Requirements: | NBI: At least two sources.
EC: Mimimum 5 gyrotrons. FW: Need >1 MW at 60 MHz. | ||
| Diagnostic Requirements: | MSE is critical. | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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