Studies on Thermal Simulation of PFN Capacitors of Pulsed Klystron Modulator for 10 meV 10 kW Industrial Linac
摘要
RRCAT has developed and deployed 10 meV, 10 kW Industrial Linac. The Linac has been powered using a high power, pulsed klystron-based amplifier. Pulse modulator provides high power pulses to klystron amplifier. PFN capacitors used in pulse modulators are manufactured by an Indian company to meet functional requirements of maximum charging voltage, peak current and repetition rate of 40 kV, 800 A and 300 Hz, respectively. However, it is desired to improve performance of these capacitors in terms of lower heating and higher PRR operation. A task force consisting of RRCAT and BARC engineers is working on development of reliable capacitor which can handle high voltage at high PRR operation up to 400 Hz and manufacture these capacitors in Indian industry. This paper describes an approach for thermal simulation of the PFN capacitor, including thermal modelling and steady-state thermal analysis using ANSYS to investigate temperature distribution. Based on thermal analysis, design improvements of the capacitors can be made to achieve low heat loss at high PRR operation.