DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 408: Comparisons of L-mode and H-mode in hydrogen and deuterium | ||
| Name: | Robert Budny ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | ITER Demonstration Discharges | Presentation time: | Not requested | Co-Author(s): | Wayne Solomon, Keith Burrell, Craig Petty (?), Jeff Candy, Ron Waltz |
| Description: | We want to improve understanding of the isotopic scaling from present experiments to those anticipated in ITER. The first phase of physics experiments in ITER is expected to be L-mode and H-mode if accessible with hydrogen. The next phase is expected to be L-mode and H-mode in DT plasmas. Most of the present database is in deuterium plasmas. We plan to create pairs of H and D L-mode and H-mode plasmas with similar profiles, similar ELM characteristics if possible, and low rotation (but presumably different beam powers). | ||
| Experimental Approach/Plan: | Create matched L- and H-mode plasmas in separate runs with H and D. | ||
| Background: | Gyrokinetic theory implies that the scaling should follow gyro-Bohm, but there are various indications that this might not be the case. One example is a study of scaling of transport in JET H-modes with H, D, DT, and T plasmas (R.Budny et al, PoP 12 (2000) p5038-5050). The dimensionless coefficients of ion energy and momentum transport near the mid-radius scaled as isotopic mass to a power near minus unity instead of the gyrokinetic rho* prediction of plus 0.5. | ||
| Resource Requirements: | co & ctr NBI | ||
| Diagnostic Requirements: | plasma profiles including CX and MSE; turbulence measurements | ||
| Analysis Requirements: | We will GYRO code to compare their transport and turbulence. We can swap profiles and rho* to compare effects of different profiles and rho* on transport. We anticipate needing lots of nonlinear, extended-radial domain runs for the analysis | ||
| Other Requirements: | -- | ||
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