Injection Bucket Jitter Compensation Using Phase Lock System At Fermilab Booster

TL;DR

This paper discusses a digital phase lock system at Fermilab that reduces extraction bucket jitter and beam loss during Recycler injection by improving phase matching between Booster and Recycler RF systems.

Contribution

Introduction of a programmable digital phase lock system that corrects extraction notch position and reduces beam loss in Fermilab's Booster-Ring operation.

Findings

20% reduction in beam loss at Recycler injection

Successful correction of extraction notch position

Enhanced phase matching stability

Abstract

The extraction bucket position in the Fermilab Booster is controlled with a cogging process that involves the comparison of the Booster RF count and the Recycler Ring revolution marker. A one RF bucket jitter in the extraction bucket position results from the variability of the process that phase matches the Booster to the Recycler. However, the new slow phase lock process used to lock the frequency and phase of the Booster RF to the Recycler RF has been made digital and programmable and has been modified to correct the extraction notch position. The beam loss at the Recycler injection has been reduced by 20%. Beam studies and the phase lock system will be discussed in this paper.