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Study on the compression of field-reversed configuration (FRC) by a magnetic-driven solid liner is carried out based on a one-dimensional code. In the investigation, plasma self-heating effect by alpha particles is taken into account. Numerical results show that the self-heating of alpha particles to DT plasma mainly occurs in the vicinity of O-point of the FRC target. The plasma ignition region is divided into two parts: the low-density ignition region near the central axis and the high-density ignition region in the O-point area. Before FRC plasma target expansion, the energy of alpha particles is well confined nearby the O-point by compressed magnetics. The DT plasma volume burning exists in a short time (approximately 0.1 µs) after a maximum convergence ratio of solid liner and the compressed strong magnetic field degrades the propagation of FRC plasma burning. [ABSTRACT FROM AUTHOR]

The effect of deeply trapped electrons on the collisionless damping of geodesic acoustic modes is studied in the simple toroidal configuration assuming that ωde ≪ ωbe, where ωde and ωbe are the geodesic drift frequency and bounce frequency of the trapped electrons. The rate of the damping induced by the trapped electrons is found to be an increasing function of the safety factor q until the edge of the tokamak plasma is reached. In the low q range, the rate of the damping caused by the circulating ions is larger than that of the damping caused by the trapped electrons, but as q increases, the latter becomes comparable with and even exceeds the former at the edge of the tokamak plasma. [ABSTRACT FROM AUTHOR]