DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 22: Collisionality Dependence of RMP Suppression | ||
| Name: | Mickey R. Wade ( |
Affiliation: | General Atomics |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Utilize two separate non-dimensional scans to assess collisionality dependence of ELM suppression using RMPs: 1) collisionality scan at fixed rho*, beta, and delta_br/Bt to determine collisionality threshold for RMP suppression; 2) rho* scan at fixed beta, collisionality, and delta_br/Bt to determine if ELM suppression can be obtained at fixed collisionality over range of conditions. | ||
| Experimental Approach/Plan: | 1) Starting with a successful case that has demonstrated ELM control using RMPS, conduct a collisionality scan at fixed rho*, beta, and delta_br/BT. This will require the following variations: density = constant, temperature as B^2, Ip as B, and delta_br as B. Higher field will mean lower collisionality so majority of scan will likely be done at lower field than successful case. 2) Starting with successful case, increase toroidal field at constant rho*. Will require varying density ~ B^4/3, temperature as B^2/3, Ip as B, and delta_br as B. | ||
| Background: | A still outstanding question for ELM suppression via RMPs is whether the density or collisionality (or some combination) is the key parameter in achieving ELM suppression. This is a key question in extrapolating this to ITER and future burning plasma devices as low density is unfavorable in a burning plasma device while low collisionalitly is expected in such a device. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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