Interconnected High-Voltage Pulsed-Power Converters System Design for H⁻ Ion Sources

Abstract

Abstract-This paper presents the design and experimental validations of a system of three new high-voltage (HV) pulsedpower converters for the H − sources. The system requires three pulsed voltages (50, 40, and 25 kV to ground) at 2-Hz repetition rate, for 700 µs of usable flat-top. The solution presents ripplefree output voltages and minimal stored energy to protect the ion source from the consequences of arc events. Experimental results on the final full-scale prototype are presented. In case of short-circuit events, the maximal energy delivered to the source is in the Joule range. HV flat-top stability of 1% is experimentally achieved with a simple Proportional-IntegralDerivative regulation and preliminary tuned H − source (e.g., radio frequency control, gas injection, and so forth). The system is running since more than a year with no power converter failures and damage to the source.

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