DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 109: Daily Reference Shot Monitoring of Wall Conditions | ||
| Name: | Phil West ( |
Affiliation: | General Atomics |
| Research Area: | Boundary | Presentation time: | Not requested | Co-Author(s): | P. West, M. Groth, N. Brooks |
| Description: | |||
| Experimental Approach/Plan: | Run DRS as first discharge of each operations day | ||
| Background: | The daily reference shot was initiated in 2006 as a long-term monitor of changes in wall conditioning. It is designed with 4 phases, L-mode during rampup and early flat top, a power ramp phase to induce an L-H transition, an ELM free H-mode period, and an ELMing H-mode period. During these four phases, impurity line emission and radiated power provide monitors of impurity content. Gas fueling, density rate of rise after the L-H transition, and the density during ELMing H-mode serve as monitors of the wall fueling source. Over the 2006 and 2007 campaigns, little or no secular trends are seen in the key wall conditioning indicators. This is consistent with the ability to repeat high performance shots on a routine basis. Based on these finding, the repetition rate of boronization events has been decreased substantially. | ||
| Resource Requirements: | At least 2 beams, preferably 30L, 330L & R
Interferometer for density feedback control | ||
| Diagnostic Requirements: | Essential:
CO2 Interferometry SPRED Highly Desired: CER Thomson Bolometry Visible Bremsstrahlung Filterscopes Multichord Divertor Spectrometer Lower Tangential TV | ||
| Analysis Requirements: | Routine running of the DRS database program (P.West)
Reconstruction of Lower Tangential TV data (M. Groth) MDS spectra analysis (N. Brooks) | ||
| Other Requirements: | -- | ||
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