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For the Low Emittance Gun (LEG) project at Paul Scherrer Institute a stableand reliable high voltage pulsed generator was needed in order to study lowemittance beams generation and transport. The system had to provide variableasymmetric voltage pulse up to -500 kV with amplitude stability better than 1.2part per thousand (ppt). The pulse should be applied to the cathode of variablegap accelerating diode providing voltage gradients up to more than 100 MV/m. Abroad bandwidth electrical connection to the cathode is necessary in order todeliver fast cathode gating signal. The design of the pulser is presented aswell as the optimization and implementation of some critical components in thesystem. A detailed electrical model of the pulsed generator was created inorder to optimize and study its electrical behavior. The measured waveforms arecompared to the simulated ones and output amplitude stability is discussed.Different electrode materials and surface treatments were studied to ensurebreakdown free operation of the gun at high electrical gradients. Diamond LikeCarbon (DLC) coating has shown excellent vacuum gap insulation capabilitiesreaching surface breakdown electric field of more than 250 MV/m. The designedhigh voltage system showed very good stability and reliability and it was auseful tool for many cathode and electron beam studies.

Tesla transformer based 500 kv pulser for low emittance test stand at Paul Scherrer Institute