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NSTX

NSTX. Supported by. NSTX Centerstack Upgrade Project Meeting P. Titus January 13, 2010. Resistive Re-Distribution of Halo Currents. Pomphrey/Bialek Paper Results.

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NSTX

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  1. NSTX Supported by NSTX Centerstack Upgrade Project Meeting P. Titus January 13, 2010 Resistive Re-Distribution of Halo Currents

  2. Pomphrey/Bialek Paper Results

  3. Halo Current Entry and Exit Added to SRI’s Macro, simply as AMPS loading. resulting current distribution is (believed to be) the resistive solution BR=130000*12*3*2e-7 *get,nmax,node,,num,max *do,i,1,nmax z=nz(i) x=nx(i) d,i,ay,vect4(x,z) d,i,az,-0.5*BR*log(x*x) *enddo d,all,ax,0. f,32437,amps,700000.0 f,18830,amps,-700000.0 lswrite,4 time,10.02 autots,1 deltim,.001,.0005,.002 kbc,0 *dim,vect5,table,81,81,1,x,z,,5 *tread,vect5,'5','txt' nall BR=130000*12*3*2e-7 *get,nmax,node,,num,max

  4. Inductive Plus (Resistive) Halo Current Densities

  5. Equatorial Plane Peaking Factor .64e8*2*pi*.29*.00635 =740kA From: Pomphrey/Bialek Paper NSTX Ac= 1 NSTX CSU Ac=1.6 Peaking Factor=1.05 You would expect From Pomphrey/Bialek maybe 55/50 = 1.1 .60e8*2*pi*.29*.00635 = 694kA

  6. Inductive Plus (Resistive) Halo Lorentz Forces

  7. time,10 nsubst,100 ! For more finer results use larger #. betad,0.0005 !Damping kbc,0 fdele,all,all ldread,forc,1,,,,elect2,rst, ! Use the appropriate file name. Preliminary Dynamic Analysis Results

  8. Radial Displacement Dynamic Analysis Results, Displacement in m

  9. Conclusions: • Continue Analysis – Expand Plasma Disruption Simulations with Poloidal Currents as well as Toroidal Plasma Currents • Monitor/Instrument Mid-Plane Halo Currents During Operation

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