A Formula of the Electron Cloud Linear Map Coefficient in a Strong Dipole

TL;DR

This paper derives a simple formula linking the electron cloud linear map coefficient to key parameters, aiding faster analysis of electron cloud effects in storage rings like the LHC.

Contribution

It introduces an approximate analytical formula for the electron cloud linear map coefficient specific to strong dipoles, reducing reliance on time-consuming simulations.

Findings

The formula accurately predicts electron cloud behavior in LHC dipoles.

It simplifies the analysis of electron cloud effects in storage rings.

The approach enables quicker parameter space exploration.

Abstract

Electron cloud effects have recognized as as one of the most serious bottleneck for reaching design performances in presently running and proposed future storage rings. The analysis of these effects is usually performed with very time consuming simulation codes. An alternative analytic approach, based on a cubic map model for the bunch-to-bunch evolution of the electron cloud density, could be useful to determine regions in parameters space compatible with safe machine operations. In this communication we derive a simple approximate formula relating the linear coefficient in the electron cloud density map to the parameters relevant for the electron cloud evolution with particular reference to the LHC dipoles.