Transport and turbulence teams have not been fully engaged with steady-state experiments. Best place to start is to obtain transport reference and turbulence characterization discharges for leading DIII-D scenarios.
ITER IO Urgent Research Task :
No
Experimental Approach/Plan:
Obtain turbulence and transport documentation for the four leading steady-state scenarios on DIII-D, viz q_min~1.5, q_min > 2, ITER steady-state scenario, and off axis-NBI scenario. This requires repeat shots of discharges from each scenario to vary beam mix (BES versus CER), DBS wavenumbers, and CECE location.
Background:
Transport is the limiting factor in steady-state experiment. Confinement varies between campaigns/years and between scenarios - i.e. ITER steady-state scenario had unexpectedly good confinement, while confinement in other regimes has deteriorated. This argues for obtaining transport and turbulence documentation/reference shots for our key steady-state scenarios.