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Lower Ip Long Pulse L-mode and H-mode Advanced Scenarios

Lower Ip Long Pulse L-mode and H-mode Advanced Scenarios. C. Kessel*, A. Hubbard *Princeton Plasma Physics Laboratory C-MOD Ideas Forum, December 13-15, 2007. Goals -- 1-2 Run Days. Examine lower Ip discharges to obtain higher boostrap current and higher non-inductive current fractions

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Lower Ip Long Pulse L-mode and H-mode Advanced Scenarios

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  1. Lower Ip Long Pulse L-mode and H-mode Advanced Scenarios C. Kessel*, A. Hubbard *Princeton Plasma Physics Laboratory C-MOD Ideas Forum, December 13-15, 2007

  2. Goals -- 1-2 Run Days • Examine lower Ip discharges to obtain higher boostrap current and higher non-inductive current fractions • Determine energy confinement in the lower Ip plasmas with ICRF power scan • Examine the benefits of longer Ip rampup times to control the q-profile with and without LHCD in the rampup -- density control to maximize effect of LHCD • Produce these discharge in both L-mode and H-mode to determine if there are advantages to control the transport regime • Extend the pulse lengths to maximize the number of current relaxation times and to allow for development of modulation/control techniques in the advanced scenarios

  3. Low Ip Long Pulse L-mode and H-mode Advanced Scenarios Establish lower Ip ramps at different ramp rates, to 600, 450 and 300 kA -- document q-profile and loop voltage, both with/without LH injection in the ramp standard 800 kA 450 kA, for example Ip PLH PIC Time, ms 100 250 500 750 1000

  4. Low Ip Long Pulse L-mode and H-mode Scenarios Establish longest pulse length available at lower Ip values, BT values, and with L-mode (low heating) and H-mode (no LH) OH flux swing TF flattop PFC heating Other??? standard 800 kA Ip 450 kA, for example PIC 100 1500 Time, ms

  5. TSC-LSC Simulation of LHCD for Ip = 600 kA H-mode PIC = 3.5 MW, PLH = 2 MW n|| = 2.5 (ILH = 144 kA) 1D Fokker-Planck may under-estimate the LHCD -- compare with CQL3D LH providing good boost to NI current qo close to 1, good hybrid target

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