DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 395: Turbulence dependence on rho_* via working gas species (Hydrogen and Helium) (see transport area) | ||
| Name: | Terry L. Rhodes ( |
Affiliation: | University of California, Los Angeles |
| Research Area: | Hydrogen Discharges | Presentation time: | Not requested | Co-Author(s): | Peebles |
| Description: | (Note that this proposal is being submitted here for completeness. The main submission is to the transport area.) Use dimensionally similar helium and hydrogen plasmas with matched Te, Ti, �?� to compare fluctuation and transport properties. Direct tests of turbulence simulation will be performed. | ||
| Experimental Approach/Plan: | Use helium and hydrogen plasmas with matched Te, Ti values. Te, Ti ratios and profiles will be adjusted using ECH, co and counter neutral beams. The rotation and radial electric fields will also be monitored and matched as possible. Use will be made of all the available turbulence and other diagnostics as appropriate. If successful the approach can be modified to examine shaped plasmas, H-mode/QH-mode plasmas, etc. | ||
| Background: | There is a well known dependence of the plasma confinement on the mass of the working gas, varying approximately as (Mass)^0.5. This variation will be addressed by comparing helium and hydrogen plasmas with Ti, Te matched as closely as possible. This should give approximately the same rho_i,e but of course different working gas masses. Theoretical turbulence expectations appear to depend upon the value of rho_i,e rather than the mass itself so the naïve expectation is that the plasmas should be very similar. Comparison of low, intermediate, high k turbulence, transport analysis, etc. will be made between the plasmas and theoretical expectations (analytic, numerical �??GYRO, GS2,�?�) . | ||
| Resource Requirements: | Hydrogen and helium plasmas, ECE, co and counter NBI | ||
| Diagnostic Requirements: | low, int, high k scattering diagnostics, Doppler
backscattering, CECE, BES | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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