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Characterization of the Boundary Layer and Power Flow to the Divertor

Characterization of the Boundary Layer and Power Flow to the Divertor. S.F. Paul, J. Boedo, R. Maingi and the Boundary Physics Task Group. Experimental Run Plan (2 days). Conditioning: Perform 30 minutes of H e GDC. NBI Power Scan:

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Characterization of the Boundary Layer and Power Flow to the Divertor

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  1. Characterization of the Boundary Layer and Power Flow to the Divertor S.F. Paul, J. Boedo, R. Maingi and the Boundary Physics Task Group

  2. Experimental Run Plan (2 days) • Conditioning: • Perform 30 minutes of He GDC. • NBI Power Scan: • Establish discharges with Ip~ 800 kA with a 200-300 msec flat top, Bt = 4.5 kG, <ne> = 2.5  1013 cm-3 • Inject NBI into plasma with above conditions varying injected power from 0.5 to 6 MW in 0.5 MW steps:  1 @50% modulation  1 source  1 +1 @50% modulation  2 sources  2 +1 @50% modulation  3 sources

  3. Configuration scan • DND Configuration scan: (6 shots) • Use DND configuration with same operating conditions, injecting with one NBI source. • Repeat this configuration, but with two NBI sources. • CSL comparison • In CSL configuration and inject with one NBI source into L-mode plasma.

  4. Density scan • Revert to LSN configuration and inject with two NBI sources. • Repeat this configuration, but change profile integrated electron density to <neL> = 2  1015 cm-2, 4  1015 cm-2, and 5  1012 cm-3, taking 2 shots at each condition. Examine for signs of plasma detachment and changes in density profile.

  5. Supplemental Scans • Ip scan for comparison with 800 kA baseline • Scan Ip @ 600 kA and 1 MA, LSN, 2 NBI sources, with same conditions as in power scan • Toroidal field scan for comparison with 4.5 kG baseline • Scan BT at 3, and 3.5 and 4 kG with Ip = 800 kA, LSN, 2 NBI sources, with same conditions as in power scan. May take data at BT = 5 kG if NSTX if permissions are available.

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