DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 476: ECCD profile in presence of magnetic island | ||
| Name: | Ron Prater ( |
Affiliation: | General Atomics |
| Research Area: | Heating & Current Drive | Presentation time: | Not requested | Co-Author(s): | C. Petty, F. Volpe |
| Description: | Measure the equilibrium ECCD when it is appled to an island O-point or X-point. Use the I-coil and nearly-balanced neutral beam injection to obtain a stationary 3/2 island. Using the known toroidal phase of the island, drive ECCD at the island O-point or X-point and use MSE signals to compare the effects. Or use a slowly rotating entrained mode and modulate the ECCD in phase. | ||
| Experimental Approach/Plan: | -- | ||
| Background: | ECCD in an island O-point is key to stabilization of NTMs, as needed for success on ITER. But the profile of ECCD has never been measured in the presence of an island. There are some theories, but they are not well validated. If the ECCD in the island is modulated, it's important to know if it stays within the island or spreads to the entire annulus since this affects the power requirements. | ||
| Resource Requirements: | I-coil; at least 4 gyrotrons; 2 counter beams and 3 co beams. | ||
| Diagnostic Requirements: | MSE co and counter views. | ||
| Analysis Requirements: | Analysis would benefit from improvements to the NVLOOP code to account for non-axisymmetric effects. | ||
| Other Requirements: | -- | ||
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