抄録
We measured the breakdown probability at a low pressure in argon over the range from 0 to 1,500 gauss of the magnetic field parallel to the electric field. With the overvoltage fixed at 16.5%, the number of times of breakdown was counted for the applied square pulses with an electronic counter. Thus we found that the breakdown probability increased with magnetic field intensity. We calculated the breakdown probability on the assumption that breakdown was caused by multi-avalanche, and the secondary mechanism was due to the drift of resonance radiation in the diffusion process as Kachikas and Fisher had suggested. A fairly good agreement between theory and experiment was attained and the drift velocity of resonance radiation was about 9.5×105 cm. sec−1 in our calculation.
