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在托卡马克装置中,当瞬态电磁现象发生时,涡流在环绕等离子体的导体结构上感应。当非常快的瞬态发生时,如等离子体破裂、涡流与磁场(即外加场和涡流本身的磁场)耦合将在导体结构上可能产生巨大的电磁力。实验观察揭示了破裂可分为两个时间阶段。在第一阶段(称为能量猝灭,又称热猝灭),等离子体在约1ms的时间内冷却,大部分等离子体的热能迅速转移到第一壁上。在第二阶段,冷等离子体和它相当高的电阻耗散等离子体电流的磁能,同时伴随等离子体极向和径向的位移,这种感应电阻性破裂称为电流猝灭,持续大约20ms。在我们的FEB概念设计中,环向等离子体电流约6.0
In tokamak devices, when transient electromagnetic phenomena occur, eddy currents are induced on the conductor structure surrounding the plasma. When a very fast transient occurs, such as a plasma rupture, the coupling of the eddy current with the magnetic field (ie, the applied field and the magnetic field of the vortex itself) will generate a tremendous amount of electromagnetic force on the conductor structure. Experimental observations revealed that rupture can be divided into two time periods. In the first phase (called energy quenching, also known as thermal quenching), the plasma cools in about 1 ms, and most of the plasma’s thermal energy is rapidly transferred to the first wall. In the second phase, the cold plasma and its rather high resistance dissipate the magnetic energy of the plasma current, along with the plasma polar and radial displacements. This induced resistive rupture is called current quenching for about 20 ms. In our FEB conceptual design, the toroidal plasma current is about 6.0