Implications of a 20-Hz Booster cycle-rate for Slip-stacking

TL;DR

This paper analyzes the effects of increasing the Booster cycle-rate from 15-Hz to 20-Hz on slip-stacking, highlighting impacts on bucket area, RF interference, and beam parameters, with potential mitigation strategies.

Contribution

It provides a detailed comparison of slip-stacking implications between 15-Hz and 20-Hz Booster cycle-rates, including potential solutions to mitigate increased aperture requirements.

Findings

20-Hz cycle-rate increases slip-stacking bucket area

RF interference losses can be reduced by a factor of 4-10

A different injection scheme can eliminate the need for larger momentum aperture

Abstract

We examine the potential impacts to slip-stacking from a change of the Booster cycle-rate from 15- to 20-Hz. We find that changing the Booster cycle-rate to 20-Hz would greatly increase the slip-stacking bucket area, while potentially requiring greater usage of the Recycler momentum aperture and additional power dissipation in the RF cavities. In particular, the losses from RF interference can be reduced by a factor of 4-10 (depending on Booster beam longitudinal parameters). We discuss the aspect ratio and beam emittance requirements for efficient slip-stacking in both cycle-rate cases. Using a different injection scheme can eliminate the need for greater momentum aperture in the Recycler.