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Title |
321: Access to low torque QH-mode using high beta low torque AI target with NRMF |
Name: | Wayne Solomon solomon@fusion.gat.com |
Affiliation: | General Atomics |
Research Area: | Inductive Scenarios |
Presentation time: |
Not requested |
Co-Author(s): | AM Garofalo |
ITPA Joint Experiment : |
No |
Description: | The aim of the experiment is to try to integrate ELM-free operation into the low torque advanced inductive scenario by utilizing the QH-mode edge. The aim would be to combine the favorable characteristics of QH-mode at low rotation, with demonstrated stationary, low torque operation above betaN>3 from the advanced inductive. |
ITER IO Urgent Research Task : |
No |
Experimental Approach/Plan: | Start with a low torque AI like #145338 and working on the early density to allow access to QH-mode, and applying NRMF to try to establish the edge ExB shear believed needed for QH-mode. This discharge is unstable to 2/1 NTMs without EC power, and lower density will certainly exacerbate this, so EC will likely be needed. This, may be unfavorable for QH-mode operation. Still it may be possible to remove the EC once the NRMF is turned on. |
Background: | In FY11, advanced inductive discharges were successfully initiated and sustained with low torque and normalized fusion performance approaching the requirements for ITER Q=10 operation. One obvious missing element of this regime as an operating scenario for ITER is ELM-free operation. Integrating advanced inductive operation with a QH-mode edge may offer a solution to this, while potentially also enabling a recovery of the lost confinement associated with low torque operation to date. |
Resource Requirements: | 1 day expt, 6 gyrotorons, 210 beams, I-coils for nRMF, possible counter-Ip |
Diagnostic Requirements: | |
Analysis Requirements: | |
Other Requirements: | |