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Plasma major disruption is one of the most critical issues to be solved for a tokamak fusion reactor. Experiments to prevent mode locking and subsequent disruptions have been carried out on J-TEXT tokamak using rotating resonant magnetic perturbations (RMPs). The tearing modes, to be locked and to lead to disruptions without applying RMPs, can be accelerated by rotating RMPs to the RMP frequency. As the result, the mode locking and subsequent disruptions are delayed or prevented. The effects of RMP amplitude and frequency on disruption prevention have been investigated.

In this paper the size-dependence of energy relaxation, which is induced by the electron-phonon (e-ph) interactions and the electron-surface (e-s) interactions in noble metal nanoparticles, is investigated. Then based on the analysis and the derivation of the e-s coupling constant in metal nanospheres, the formula of the effective electron-phonon coupling constant Geff of hollow gold nanospheres (HGNs) is deduced. Moreover, the correctness of the formulae gets proved by contrast analyses of the calculated Geff values and experimental values obtained from literature.

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