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The bootstrap current and its consequences

机译：自举电流及其后果

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The physical mechanism behind the bootstrap current is explained, and the consequences are discussed with the emphasis on the two main objectives of fusion plasma, confinement and MHD stability. For a tokamak reactor that is optimized for good confinement and stability, and that has a limited size, the total plasma current exceeds the bootstrap current by a factor of three to five and therefore almost all the plasma current must be driven through other means. Furthermore, the neoclassical tearing mode which is driven by the bootstrap current is expected to be the limiting MHD instability in these reactors. Raising the fraction of the bootstrap current is not expected to be beneficial for confinement and stability expect when broad pressure profiles (internal transport barriers) can be realized. In stellarators several optimizations are possible, either optimizing the current to zero such that it does not destroy the desired topology, and it does not generate any current-driven instabilities, or using the current to generate some of the poloidal field. [References: 37]
机译：解释了自举电流背后的物理机制，并重点讨论了聚变等离子体的两个主要目标，限制和MHD稳定性，讨论了后果。对于为获得良好的封闭性和稳定性而优化且尺寸有限的托卡马克反应堆，总等离子体电流超过自举电流的三到五倍，因此几乎所有等离子体电流都必须通过其他方式驱动。此外，由自举电流驱动的新古典撕裂模式有望成为这些反应堆中有限的MHD不稳定性。当可以实现较宽的压力曲线（内部传输屏障）时，提高自举电流的分数不会对限制和稳定性产生好处。在恒星器中，可以进行几种优化，将电流优化为零以使其不会破坏所需的拓扑结构，并且不会产生任何电流驱动的不稳定性，或者使用电流来生成一些极场。 [参考：37]

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