Shielding Effectiveness of HV-HF Transformer for Accelerator Applications

High-voltage high-frequency transformers are employed in DC accelerators. The high frequency produced by the inverter at lower voltage is stepped up to several tens of kilovolts using step-up transformers. These transformers are subjected to high-frequency transients from high-voltage multiplier columns. Electrostatic shielding is very effective in common mode noise reduction. However, in accelerator applications, shielding effectiveness obtained using conductive shields is found compromised in practice. This paper investigates the reasons behind this phenomenon and explores remedial measures.