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 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
100
250
500
750
1000
Time, ms

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