IEEE NPSS Real Time Conference 2009 Real-Time Tokamak Application Utilizing On-line High Performance Computing Aljosa Vrancic, Lothar Wenzel, Bryan Marker, Michael Cerna, Nanxiong Zhang, Dong Chen, Bin Wang IEEE NPSS Real Time Conference 2009

Plasma Control in Tokamak Grad-Shafranov equation The solution is used to control the shape of plasma. Control cycle time must be 1 ms or faster.

Implementation Principle Component Analysis-based method Pre-calculate thousands of solutions off-line PCA makes the connection between off-line calculations and real-time measurement Require very fast linear algebra operation Might predicate wrong solution in some cases Spectral method More accurate than PCA-based method Also can be parallelized on multi-core computer

Benchmarks 18 slot PXI chassis 16 National Instruments PXI 6143 S Series cards with 16 bit ADC’s 128 channels sampled at 10 kHz PCIe-PXI bridge, 110 MB/s Dell PowerEdge 2950 2 quad-core Intel Xeon X5365 3 GHz The benchmarks were in the 0.2 ms range, which left enough room for several other parts of the algorithm to finish the entire control loop in 1 ms.