Right-angle closed all-tungsten divertor suitable for Tokamak nuclear fusion device

Abstract

The invention discloses a right-angle closed all-tungsten divertor suitable for a Tokamak nuclear fusion device. The right-angle closed all-tungsten divertor comprises a horizontal outer target plate, a vertical outer target plate, a vertical inner target plate, an inner target plate End Box, a Dome target plate, a high-field side baffle, a low-field side baffle, a passive target plate and a built-in water cooling coil. The horizontal outer target plate and the vertical outer target plate form a right-angle closed geometric structure, so that the sealing performance of the outer target plates of the divertor is improved, the density threshold value of natural miss can be greatly reduced, the use amount of impurity gas introduced to realize miss can also be remarkably reduced, miss can be realized while good core constraint is maintained, and the thermal load of the target plates is reduced. Through polar field integrated control, strike points can be scanned between the horizontal outer target plate and the vertical outer target plate in a second-order long discharge period, and thermal loads are effectively dispersed. The design structure is simple and compact, the manufacturing and mounting precision of the tungsten divertor is conveniently controlled, the manufacturing difficulty and cost are reduced, and meanwhile the thermal load level of the target plates of the tungsten divertor is easily controlled.

Description

technical field [0001] The invention relates to an EAST tokamak device, in particular to a right-angle closed all-tungsten divertor suitable for a tokamak nuclear fusion device. Background technique [0002] The high heat load faced by the divertor target plate is one of the main bottlenecks restricting the development of fusion energy. For future fusion reactors, such as ITER, the steady-state heat load reaching the divertor target plate is about 100MW / m 2 , far exceeding the tolerance limit of the commonly used tungsten target plate ~ 10MW / m 2 ; At the same time, the temperature of the electrons reaching the target plate must be kept at a relatively low level (≤5-10eV), so as to avoid serious material surface sputtering and damage the device life. Divertor off-target is considered to be a necessary solution to alleviate the thermal load of future fusion reactors. The so-called divertor off-target means that under higher plasma density or higher radiation loss, the diver...

AI Technical Summary

Problems solved by technology

However, the existing lower divertor in EAST is a traditional carbon-walled divertor. The heat removal capacity of the target plate cannot meet the high-power discharge at all, and it has been seriously aged, so it needs to be upgraded urgently; the upgraded ITER-like tungsten divertor in 2014 is The second-long pulse operation has a remarkable heat removal ability, but due to poor confinement, a high density threshold is required, or a large amount of impurity gas needs to be injected into the divertor region to achieve divertor off-target, and it is difficult to combine with highly confined core plasma Compatible, and because the suction port is too narrow, only ~17mm, which limits the ability of the cryopump to remove particles from the divertor area, which is not conducive to long-pulse steady-state operation

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