High Burst Rate Charging System for the Lithium Lens Power Supply

TL;DR

This paper describes an upgraded pulsed power system for the g-2 experiment at Fermilab, enabling high burst rate charging of the lithium lens power supply while managing power line load and cost.

Contribution

It introduces a novel high burst rate charging system for the lithium lens power supply, addressing power line and cost challenges in the upgrade.

Findings

Achieved a 20-fold increase in charging rate.

Successfully operated the system with high burst repetition.

Maintained reasonable power line loading and costs.

Abstract

Two pulsed power systems have been upgraded for the g-2 experiment at Fermilab. The Pbar Lithium Lens supply previously ran with a half sine pulsed current of 75 kA peak, 400 us duration and a repetition rate of 0.45 pps. For the g-2 experiment, the peak current was reduced to 25 kA, but the repetition rate was increased to an average of 12 pps. Furthermore, the pulses come in a burst of 8 with 10 ms between each of 8 pulses and then a delay until the next burst. The charging rate has gone up by a factor of 20 due to the burst speed. A major challenge for the upgrade was to charge the capacitor bank while keeping the power line loading and charging supply cost to a reasonable level. This paper will discuss how those issues were solved and results from the operational system.