(b) Utcp1=1kV
Fig 2 The influence of different Utcp2(0.3kV、0.5kV、1kV) on PRF: (a) Utcp1=0.3kV;
(b)Utcp1=1kV
For this reason, simulation verification is carried out for the case of
higher main trigger voltage Utcp1. Figure 3 shows when
the Utcp1 is 1kV, the influence of different pre-trigger
voltages Utcp2 (0.3kV, 0.5kV, 1kV) on the trigger
current. Appropriately increasing the Utcp2 (from 0.3kV
to 0.5kV) can improve the current growth rate. However, continuing to
increase the Utcp2 to 1kV corresponds to the current
rise speed can be seen to decrease. This is because when the
Utcp2 = 0.5kV, the current is close to saturation, and
further increase of the Utcp2 at this time will cause
some electrons to be directly pumped to the anode, resulting in the
weakening of impact ionization and the weakening of current.