Proposal for Single-Bunch Collimator Wakefield Measurements at SLAC ESTB

TL;DR

This paper proposes new experimental tests at SLAC ESTB to measure collimator wakefields, aiming to improve understanding and reduce discrepancies between theory and previous measurements for future linear collider designs.

Contribution

It introduces a plan to perform collimator wakefield measurements at SLAC ESTB for different bunch lengths, enhancing the accuracy of models for collider optimization.

Findings

Discrepancies identified between past measurements and theoretical models.

SLAC ESTB can simulate conditions relevant for ILC and CLIC.

Proposed tests will refine wakefield understanding for collider design.

Abstract

Collimator wakefields in the Beam Delivery System (BDS) of future linear colliders, such as the International Linear Collider (ILC) and the Compact Linear Collider (CLIC), can be an important source of emittance growth and beam jitter amplification, consequently degrading the luminosity. Therefore, a better understanding of collimator wakefield effects is essential to optimise the collimation systems of future linear colliders in order to minimise wakefield effects. In the past, measurements of single-bunch collimator wakefields have been carried out at SLAC with the aim of benchmarking theory, numerical calculations and experiments. Those studies revealed some discrepancies between the measurements and the theoretical models. New experimental tests using available beam test facilities, such as the End Station A Test Beam (ESTB) at SLAC, would help to improve our understanding on collimator wakefields. ESTB will provide the perfect test bed to investigate collimator wakefields for different bunch length conditions, relevant for both ILC (300 micrometers nominal bunch length) and CLIC (44 micrometers nominal bunch length) studies. Here we propose to perform new experimental tests of collimator wakefield effects on electron/positron beams at SLAC ESTB.