DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 404: QH mode comparison in DIII-D and JT-60U | ||
| Name: | Yoshiteru Sakamoto ( |
Affiliation: | JAEA |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | P. Gohil, N. Oyama, Y. Kamada, H. Urano |
| Description: | Purposes of this experiment are to clarify the roles of toroidal rotation, GAPOUT and EHO in accessing and maintaining QH-mode plasmas, and to investigate the pedestal structure in different edge toroidal rotation by utilizing the control capability of toroidal rotation in DIII-D and JT-60U. (ITPA inter-machine experiment TP-5/PEP-14) | ||
| Experimental Approach/Plan: | In JT-60U, QH-mode was observed in co-, ctr- and balanced injection plasmas with EHO. Optimum GAPOUT seems to depend on edge toroidal rotation. Increase in power during QH-mode leads to ELMy H-mode. Therefore we propose the following experiments on DIII-D. (1) GAPOUT scan during fixed edge toroidal rotation. (2) NB power scan in different edge toroidal rotation. The effects of toroidal rotation and GAPOUT on accessing QH-mode, and the change in pedestal structures in DIII-D will be compared to those in JT-60U. | ||
| Background: | The mitigation of the pulsed large heat load induced by ELM on the diverter plates is one of the important issues for a tokamak fusion reactor. QH-mode plasmas, found in DIII-D, with H-mode confinement but without such ELM-related physics issues can potentially offer an attractive regime for tokamak operations. In JT-60U, QH-mode was observed in co-, ctr- and balanced injected plasmas with large and optimum GAPOUT. Optimum GAPOUT seems to depend on edge toroidal rotation. The EHOs were observed in the edge channels of the ECE and BES diagnostics during QH-mode phases. The comparison of QH-mode properties in DIII-D and JT-60U is useful to improve understanding of QH-mode. | ||
| Resource Requirements: | Co and Counter NBs, cryopumps | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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