DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 339: Control of the heat and particle flux in radiative divertors | ||
| Name: | Mathias Groth ( |
Affiliation: | Lawrence Livermore National Laboratory |
| Research Area: | General PCO | Presentation time: | Not requested | Co-Author(s): | S.L. Allen, D. Humprheys, T.D. Petrie, and the Boundary Physics, Plasma Control, and Core-Edge Integration groups |
| Description: | Develop and demonstrate stable, feedback-control, radiative divertor scenarios. Identify suitable sensor (e.g., bolometer channel, filterscope, Langmuir probe, IRTV) and actuators (gas valves in the divertor). Test feedback in several operating regimes (e.g., with type-I ELMing toward detached divertor) | ||
| Experimental Approach/Plan: | Select one of our established radiative divertor scenarios as starting point. Identify sensors and actuators. Run this scenario in feedback control. Scan collisionality (density and power) to test feedback | ||
| Background: | Control of the detachment (ionization) front is instrumental in future devices (=ITER!) with strong heatfluxes to the target plate. To reduce the heat flux in ITER, the currently envisioned scenario foresees radiative divertors using Ne and Ar seeding. However, stable divertor operation must be demonstrated in present devices, including the feedback-controlled position of the detachment front. Large, type-I ELMs may still burn through the detachment front, requiring a novel feedback approach. | ||
| Resource Requirements: | As part of radiative divertor program (core-edge integration) develop feedback control. Dedicate run time when feedback loop is programmed in PCS. | ||
| Diagnostic Requirements: | Bolometer, floor Langmuir probes, filterscope, IRTV -> sensors must be accessible by PCS | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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