Solid-State Pulsed Power Modulator for 9.3 GHz 1.7 MW X-Band Magnetron | IEEE Journals & Magazine | IEEE Xplore

Solid-State Pulsed Power Modulator for 9.3 GHz 1.7 MW X-Band Magnetron


Abstract:

This article describes a modification and an experiment conducted on a solid-state pulsed power modulator (SSPPM) for medical linear particle accelerator (LINAC) applicat...Show More

Abstract:

This article describes a modification and an experiment conducted on a solid-state pulsed power modulator (SSPPM) for medical linear particle accelerator (LINAC) applications. Depending on the operating condition of the magnetron, an existing design of an insulated-gate bipolar transistor (IGBT)-based modulator is modified, from a positive pulse generator to a negative pulse generator. The design of the gate driver circuit of the pulse discharging IGBTs is also slightly changed to secure reliability against the arc condition. The developed modulator has the following maximum output-pulse voltage of -40 kV, pulse current of -100 A, pulsewidth of 5 μs, and pulse repetition rate of 250 Hz. By adapting the proposed design to the pulsed power modulator for driving the magnetron, high peak and average power densities of 43 kW/L and 48.9 W/L, respectively, can be achieved. The experimental results from various tests conducted using a resistor load, including a rated operation and an arc protection, verify the robustness and utility of the developed SSPPM for medical LINAC applications. An experiment using a 9.3-GHz 1.7-MW X-band magnetron is also conducted. The developed modulator achieved a successful arc protection operation for the arc generated in the waveguide during the magnetron drive test.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 68, Issue: 2, February 2021)
Page(s): 1148 - 1154
Date of Publication: 23 January 2020

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