Fast Valve Based On Double-Layer Eddy-Current Repulsion For Disruption Mitigation In Experimental Advanced Superconducting Tokamak

A fast valve based on the double-layer eddy-current repulsion mechanism has been developed on Experimental Advanced Superconducting Tokamak (EAST). In addition to a double-layer eddy-current coil, a preload system was added to improve the security of the valve, whereby the valve opens more quickly and the open-valve time becomes shorter, making it much safer than before. In this contribution, testing platforms, open-valve characteristics, and throughput of the fast valve are discussed. Tests revealed that by choosing appropriate parameters the valve opened within 0.15 ms, and open-valve times were no longer than 2 ms. By adjusting working parameter values, the maximum number of particles injected during this open-valve time was estimated at 7 x 10(22). The fast valve will become a useful tool to further explore disruption mitigation experiments on EAST in 2015. (C) 2015 AIP Publishing LLC.