Abstract:
Background To address the challenge of achieving central fueling in future fusion reactors, this study carried out fueling experiments on the Compact Torus (CT) injection system based on pulse high-power technology. A CT is a high-density plasma blob with self-organized magnetic confinement, and its characteristics make it an ideal carrier for central fueling in fusion devices.
Purpose The CT injection system is a novel fueling device centered on such plasma blobs. Driven by a pulsed high-power power supply, the system generates stable CT plasma within coaxial electrodes, which undergoes secondary acceleration to form a high-density plasma blob capable of long-distance stable propagation.
Methods System discharge tests show that the peak discharge current of CT is 300 kA, the average electron density is 1.2\times 10^22\text m^-3 , the velocity is 220 km/s, and it has a stable spheromak structure.
Results When applied to the EAST tokamak experiment, the results indicate that after CT injection, the plasma stored energy increases by 18%, the plasma density rises by 22%, and the plasma density rise rate is 0.4\times 10^20\text m^-3\texts^-1 , and attains a fueling efficiency of 39%.
Conclusions Comparative studies with conventional gas puffing (GP) and supersonic molecular beam injection (SMBI) reveal that CT injection outperforms these techniques in terms of injected particle number, fueling efficiency, and particle confinement time during single-shot injections.
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