GA PCS Design Studies for ITER Include Analytic Ideal MHD ... · EXS/P6-37 D.Humphreys/IAEA FEC...
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1 0 1 2 3 4 5 6 0 1 2 3 4 5 q95 q0 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 q95 q0 GA PCS Design Studies for ITER Include Analytic Ideal MHD Boundary and Real-time Error Field Correction Algorithm • Approximate ideal MHD stability boundary: – Validated with DIII-D data – Enables study of active control to maintain stability, prevent disruption • Real-time Error Field Correction – Extremum-Seeking algorithm – Varies correction field amplitude phase to maximize plasma rotation – Automatically finds optimal correction (if enough rotation…) EXS/P6-37 D.Humphreys/IAEA FEC Kyoto/October 2016 q a ≈ 1 q 0 20 - 0.5 + 2 q 0 + 0.2sin 4π q 0 - 0.5 [ ] ( = q 95 q 0 q 0 Disrupts Remains stable DIII-D Rampup Trajectories #167062 #167134 Stable region Stable region
Transcript of GA PCS Design Studies for ITER Include Analytic Ideal MHD ... · EXS/P6-37 D.Humphreys/IAEA FEC...
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GA PCS Design Studies for ITER Include Analytic Ideal MHD
Boundary and Real-time Error Field Correction Algorithm
• Approximate ideal MHD
stability boundary:
– Validated with DIII-D data
– Enables study of active control
to maintain stability, prevent
disruption
• Real-time Error Field Correction
– Extremum-Seeking algorithm
– Varies correction field amplitude
phase to maximize plasma
rotation
– Automatically finds optimal
correction (if enough rotation…)
EXS/P6-37 D.Humphreys/IAEA FEC Kyoto/October 2016
qa »1
q020
-0.5+2q0 + 0.2sin 4p q0 - 0.5[ ]( )
q95
q0 q0
Disrupts
Remains
stable
DIII-D Rampup Trajectories
#167062 #167134
Stable region
Stable
region