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Hello Klaus,

The TVS is connected after the capacitor

The voltage which is generated after the capacitor when TVS was not there is damaging the MOSFET which is there after the TVS, MOSFET is of 200V VDS  and  I am getting oscillated voltage of 304V which is damaging the MOSFET that's why I have placed the TVS diode before MOSFET.

the series Inductor and resistor I have modelled as cable inductance in actual the inductor is not there in circuit.

Vaibhav