Observation of Instabilities of Coherent Transverse Ocillations in the Fermilab Booster

TL;DR

This paper reports on the observation of transverse coherent oscillation instabilities in the Fermilab Booster, analyzing their dependence on machine parameters and discussing potential mitigation strategies to achieve higher beam intensities.

Contribution

It provides experimental observations of instabilities in the Fermilab Booster and explores how tune, coupling, and chromaticity affect these phenomena, offering insights for stability improvements.

Findings

Instabilities observed at various tune, coupling, and chromaticity settings.

Correlation between parameter settings and instability onset.

Discussion of potential methods to suppress these instabilities.

Abstract

The Fermilab Booster - built more than 40 years ago - operates well above the design proton beam intensity of 4x10**12 ppp. Still, the Fermilab neutrino experiments call for even higher intensity of 5.5x10**12 ppp. A multitude of intensity related effects must be overcome in order to meet this goal including suppression of coherent dipole instabilities of transverse oscillations which manifest themselves as a sudden drop in the beam current. In this report we present the results of observation of these instabilities at different tune, coupling and chromaticity settings and discuss possible cures.