This presentation focuses on the optimization of the trigger unit of asix-rod TVS. The different configurations of the trigger pin and of the triggerelectrode have been considered to study the electric field distribution at thetriple points of the unit embedded in the cathode. To optimize the fieldenhancement, electric field simulations with a planar and a circular heads ofthe trigger pin in combinations with a convex and a concave shaped triggerelectrodes have been done. The simulations were done with an applied triggerpulse voltage of Utrigger = 5 kV and with a discharge voltage the main switchof Uswitch = 20 kV. The experimental values had been Utrigger = 40 kV andUswitch = 5 kV. The simulation results show that the combination of a circulartrigger pin head and a concave trigger electrode yields the highest electricfield of 9.6 .106 V/m at the triple point. In-parallel experiments have beenperformed with those four trigger configurations. The results of theexperiments however cannot yet clearly confirm the trend in the results of thefield simulations.
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