设计了一种同轴场畸变气体火花开关，在开关仅受触发脉冲作用和开关内外电极分别连接正负充电电容两种条件下，实验研究了触发脉冲峰值对开关间隙在氮气中的放电通道数的影响，比较了两种条件下的放电通道数。开关仅受触发脉冲作用时，放电通道承载电流较小；开关内外电极分别连接充电电容，触发脉冲施加于开关触发极时，放电通道承载电流较大。实验结果表明：仅受触发脉冲作用时，开关内间隙的平均通道数随着触发脉冲峰值增加而显著增加；开关电极连接电容的情况下，随着触发脉冲峰值增加，开关内间隙的平均通道数增加，外间隙的平均通道数减小；相近的过电压倍数下，开关电极连接电容情况下的平均通道数明显小于开关仅受触发脉冲作用情况下的平均通道数。

A coaxial field distortion gas spark switch was designed and experiments were carried out to study the effect of trigger pulse peak on discharge channel number of the switch gaps in N2 in two cases. In the first case, only the trigger pulse was applied to the switch, while in the second, the inner and outer electrodes were connected to two capacitors with positive and negative charge respectively. The numbers of discharge channels in the two cases were compared. In the first case, discharge channels carry lower current. The average number of channels in the switch inner gap increases obviously with increasing trigger pulse peak in the first case, while the average number of channels in the switch inner gap increases and the average number of channels in the switch outer gap decreases in the second case. Under similar overvoltage multiples, the average number of channels in the second case is smaller.