DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 266: "burning plasma" control | ||
| Name: | Phil Snyder ( |
Affiliation: | General Atomics |
| Research Area: | General PCO | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Plasma control in DIII-D commonly operates in a beta feedback mode, where beam power is reduced as beta increases to avoid tearing mode and disruption beta limits. In a burning plasma, the opposite type of feedback will exist, with alpha heating power increasing strongly as beta increases. Control of such plasmas, particularly at Q>5, may be a substantial challenge, and at very high Q, some sort of "soft beta limit" may be essential to avoid a disruption. | ||
| Experimental Approach/Plan: | Use first one pair of co and counter beams, and then two pairs of co/counter beams to simulate alpha heating (attempt to balance torque of the beam pairs). Program control system to have 'alpha power' proportional to beta^2 (or more precise fusion power algorithm). Attempt control via remaining beam power, ECH etc, first at Q~5, and then at Q~10. Assess importance of operating in a regime with soft beta limits, as well as ability to tweak confinement via profile control in order to stay below beta limits. Perhaps extend by attempting control using an approximation of ITER's available control tools. | ||
| Background: | -- | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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