⚫ agriculture, ⚫ national defense, ⚫ scientific research and other fields including: ⚫ X-ray machine high voltage power supply, ⚫ laser high voltage power supply,⚫ spectral analysis high voltage power supply, ⚫ ion beam assisted deposition, ⚫ electron beam evaporation, ⚫ electron beam welding, ⚫ ion source, ⚫ glow discharge, ⚫ high voltage cable fault test, ⚫ Particle accelerator, ⚫ free electron laser, ⚫ neutron source, ⚫ cyclotron accelerator, ⚫ capacitor charger. ⚫ nanotechnology application,