DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 415: Rapid pellets for lower density radiative divertor | ||
| Name: | Anthony W Leonard ( |
Affiliation: | General Atomics |
| Research Area: | Core-Edge Integration | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Use rapid pellet injection with impurity puffing to produce a steady radiative divertor at a lower density than would be otherwise achievable. | ||
| Experimental Approach/Plan: | Set up a long pulse hybrid, or other high performance, discharge. Inject a radiating noble gas such as neon, or argon, while at the same time injecting rapid pellets, ~ 50 Hz, from the pellet dropper. Use pumping to control density. Adjust impurity injection to produce a radiative divertor with reduced heat flux. | ||
| Background: | Impurity injection for heat flux control typically results in core impurity accumulation and radiation which reduces the ELM frequency which further increases impurity acccumulation in a runaway process. Rapid pellet injection which induces ELMs offers the possibility of controlling the core impurity acccumulation keeping more of the impurities in the divertor where they can radiate away the heat flux. | ||
| Resource Requirements: | Pellet dropper, divertor pumping, and impurity injection | ||
| Diagnostic Requirements: | All divertor and pedestal diagnostics. Core impurity diagnostics. | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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