15-20 October 2017
CERN
Europe/Zurich timezone

Characterization of 1 MHz Solid State High Frequency Power Supply with Inductively Coupled Plasma

18 Oct 2017, 16:30
2h 30m
CERN

CERN

Centre international de Conférence Genève (CICG). http://www.cicg.ch/
Poster presentation Applications and related technologies Poster Session 3

Speaker

Mr Sandip A. Gajjar (ITER-India, Institute For Plasma Research)

Description

A program to develop 200 kW, 1 MHz solid state high frequency power supply is initiated in a phased manner with industry. High frequency power supply is intended for plasma formation in neutral beam source or similar applications, providing high efficiency. The present high frequency power supply is configured with multiple modules of Class-D H-Bridge inverters, magnetic combiners, tuning and matching network to provide 1 MHz sinusoidal output at 50 Ω load. A prototype 5 kW power was developed and coupled with plasma to characterize the solid state concept.

Recent experimental campaign has established matching network parameters to strike and sustain hydrogen plasma with a density in the range of 10$^{15}$ to 10$^{17}$ m$^{-3}$ at 2-3 Pa and forward power of 1.2 kW @ 1 MHz. Practical result shows that the solid state design produces plasma with an optimum power factor of 0.8-0.9 over a pulse length of 60s and beyond. It has also been observed that a power factor of 0.7-0.8 is achievable without isolation transformer in the matching circuit. Experiments are useful to study the behavior of power supply in scenarios of dynamic (plasma) conditions or sudden load/off load conditions.

This paper describes the behavior of prototype 5 kW, 1 Mhz solid state power supply during the experiment. It also gives the conceptual design of a 200 kW high frequency power supply based on the inputs learned from the prototype experiment.

Primary author

Mr Sandip A. Gajjar (ITER-India, Institute For Plasma Research)

Co-authors

Dr Mainak Bandyopadhyay (ITER-India) Mr Pranjal Singh (HBNI, Institute For Plasma Research) Mr Darshan Parmar (ITER-India) Mr Dishang Upadhyay (ITER-India) Mr Narinderpal Singh (ITER-India) Mr Rasesh Dave (ITER-India) Mr Ujjwal Baruah (ITER-India) Mr Hitesh Dhola (ITER-India) Mrs Aruna Thakkar (ITER-India) Mr Bhavin Raval (ITER-India) Mr Amit Patel (ITER-India) Mr Mehta Kush Mr Goswami Niranjan (ITER-India) Mr Mahesh Vuppugalla (Institute For Plasma Research) Dr Mahendrajit Singh (ITER-India) Mr Agrajit Gahlaut (Institute For Plasma Research) Mr Ratnakar Yadav (ITER-India) Mr Himanshu Tyagi (ITER-India)

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