A high voltage and high current pulse switch using avalanche mode thyristor has been developed for the high voltage pulse generator. When the break-over voltage is applied to a thyristor, the thyristor turns on without the gate input current. We call avalanche mode thyristor (AMT) which operates such a switch mode. AMT has many advantages, for example, turn on function without trigger input circuit in the series connection, high speed switching characteristics, etc. A magnetic switch using the saturation of the core is adopted for the high current pulse shaping. 12 stages of AMTs generate 11kV and 1.36kA with 260ns pulse width. A high voltage pulse has been produced up to 65kV, 43A by using the AMT pulse generator and a pulse trans. The behavior of AMT and the performance of the circuit are discussed.
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