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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
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