With inner radiation belt AKEBONO whistle wave parameter statistics model and background cold electron density model changed with altitude, as 1.4 ≤ L ≤ 2.0 electron bounce-averaged equator pitch angle diffusion coefficients due to Coulomb collision and wave-particle resonance interaction are calculated by using quasi-linear diffusion theory. Influences of interaction mechanisms, whistle wave types such as hiss, lightning-generated whistlers (LG), artificial very low frequency(VLF), energies and magnet shell parameter(L) on inner radiation belt energetic electrons diffusing loss are analyzed. It shows that Coulomb collision caused by atmosphere plays a dominant role in energetic electrons diffusion around equator loss cone angle, while hiss and LG are main diffusion factors near 90° of equator pitch angle. Wave-particle resonance diffusion caused by VLF plays a dominant role in inner radiation belt. Diffusion coefficients is sensitive to energetic electron energy and L. Usually, the greater the L or electron energy, the more significant the electron resonance diffusion coefficient is.

To study non-linear relations between field emission current density and temperature at top surface of a cathode microprotrusion, thermal effects on cathode microprotrusion are investigated numerically at various applied electric fields. Enhancement factor of electric field at top surface of microprotrusion is different as ratio of top radius to bottom radius is changed. It leads to obvious difference in temperature distribution in microprotrusion when temperature at microprotrusion peak reaches melting point of cathode material. At a given applied electric field, the smaller the ratio of top radius to bottom radius of microprotrusion, the shorter the time delay of explosive emission. Time delay of explosive emission increases exponentially with decrease of applied electric field.