DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 473: Comparison of particle and momentum diffusivities and pinches in helium discharges | ||
| Name: | Rajesh Maingi ( |
Affiliation: | Oak Ridge National Laboratory |
| Research Area: | Rotation Physics | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | The diffusive and convective terms of particle transport have been separated with both Helium gas puffing from the edge and also with Helium NBI injection (Wade PRL 1997) . Recently Yoshida (NF 2007 p.856) has demonstrated a similar technique to evaluate the diffusive and convective momentum transport coefficients with NBI modulation in JT-60U. The particle pinch term is likely linked with the momentum pinch term, but a detailed comparison has not been made. The basic idea is to use Helium discharges with modulated Helium NBI to simultaneously measure the particle and momentum transport coefficients in the same discharges for the main ion species. | ||
| Experimental Approach/Plan: | Run Helium discharges with Helium NBI. Use modulation to enable a transient transport analysis, and determine the relation of the particle and momentum transport coefficients on input power/collisionality. These discharges may allow a simultaneous evaluation of thermal diffusivities and pinches also. | ||
| Background: | -- | ||
| Resource Requirements: | Helium discharges with Helium NBI and modulation. | ||
| Diagnostic Requirements: | Ability to compute helium density from CER diagnostic. This was possible in the past. | ||
| Analysis Requirements: | Particle transport coefficients with CACTI or other code. Momentm transport analysis technique may need to be developed, if not possible with TRANSP or ONETWO. | ||
| Other Requirements: | -- | ||
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