磁化プラズマ中へ入射したコンパクトトーラスの三次元ダイナミクスII

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To reveal the availability of the compact torus (CT) injection method, which has been considered as one of the advanced fuelling methods for a fusion device, we have carried out three dimensional magnetohydrodynamic (MHD) simulations where the spheromak-like CT (SCT) is injected into a target magnetized plasma region modeling a fusion device. From the previous simulation results, it is revealed that the SCT penetration depth becomes shorter than that estimated from the conducting sphere model, since the injected SCT is sequentially decelerated by the Lorentz force of the target magnetic field through the plasma compressibility. In this study, we propose the new theoretical model where the injected SCT is decelerated not only by the magnetic pressure force but also by the magnetic tension force and compare it with the simulation results. Here, it is considered that the magnetic tension force is generated as a result that the SCT penetration bends the target magnetic field whose wavelength is as long as the size of the target region. By comparing the time evolution of the SCT penetration depth and the SCT kinetic energy, it is revealed that the magnetic tension force effectively acts as the SCT deceleration. In addition, we carry out the bare plasmoid injection, that is the case with the null SCT magnetic field, and investigate the effect of magnetic reconnection between the SCT magnetic field and the target one. From this result, it is found that magnetic reconnection plays a role to relax the SCT deceleration. When the strength of the target magnetic field is stronger, this effect is more remarkable. Finally, we investigate the SCT dynamics in the drift tube and reveal that the magnetic field leaking out from a fusion device affects the SCT penetration.
社団法人プラズマ・核融合学会の論文
2000-03-25

磁化プラズマ中へ入射したコンパクトトーラスの三次元ダイナミクスII

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