DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
Login | Review | Submit | Logout | Help
Questions about this website? Contact Andrew LeBlanc Questions about ROF? Contact Chuck Greenfield
| Title | 272: Hydrogen Isotope Scaling of Turbulence and Transport | ||
| Name: | George R. McKee ( |
Affiliation: | University of Wisconsin, Madison |
| Research Area: | Transport Model Validation | Presentation time: | Requested | Co-Author(s): | K. Burrell, C. Holland, C. Petty, M. Shafer |
| Description: | Measure the dependence of transport and turbulence characteristics on working ion mass using hydrogen and deuterium. | ||
| Experimental Approach/Plan: | Establish baseline discharges similar to well-characterized discharges in a dimensionless scaling experiment. Perform steady state L-mode edge inner wall limited discharges very similar to previous rho* scan discharges, but in Hydrogen. The aim to run discharges in an operationally similar manner to a baseline in deuterium (101391), similar beam power and torque, field, current and density, and document this discharge. Assuming confinement changes with isotope, nondimensional parameters (beta, collisionality) will not be matched and rho-star is already not matched by the change in isotope. Ideally, we would then then try and match the dimensionless parameters, with the obvious exception of ion mass, A, to the past discharges by adjusting toroidal field, current, heating power, torque, gas puffing, etc., to examine how transport and turbulence scales while varying only A. This would require going to lower field in Hydrogen to match rho-star from the baseline deuterium discharge (at 2 Tesla), and adjusting heating and density accordingly.
Measure turbulence throughout with BES, FIR, CECE, Correlation Reflectometer, PCI and Langmuir probes. Temperature profiles are measured for transport studies (may require beam swapping). Also, perform particle transport studies with Helium gas puffs. | ||
| Background: | Previous experiments have demonstrated increased confinement with higher atomic-mass isotopes. This issue has obvious implications for future experiments. DIII-D may perform experiments in hydrogen in 2008 allowing for such experiments to compare turbulence and transport parameters in well documented discharges, and to compare the results with comparable deuterium discharges. Results, both in terms of transport and turbulence, would be compared with transport simulations. By varying ion mass and keeping charge constant, thus changing gyroradius, these results can complement those obtained with a proposed rho* scan (C. Holland). | ||
| Resource Requirements: | Hydrogen fueling with D-beams. This experiment would be more feasible if there are significant hydrogen dischages planned in the ITER physics area. | ||
| Diagnostic Requirements: | Profile and fluctuation diagnostics and any modifications required for use in hydrogen. | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
Print this page