Simulations for CLIC Drive Beam Linac

TL;DR

This paper evaluates various lattice configurations for the CLIC Drive Beam Linac, analyzing beam stability and transverse/longitudinal effects to optimize high-current electron acceleration.

Contribution

It introduces and compares different lattice options for the CLIC Drive Beam Linac, focusing on stability and correction methods for high-current beams.

Findings

FODO, triplet, and doublet lattice options analyzed

Transverse instability effects identified for each lattice

Longitudinal stability assessed with different bunch compressors

Abstract

The Drive Beam Linac of the Compact Linear Collider (CLIC) has to accelerate an electron beam with 4.2 A up to 2.4 GeV in almost fully-loaded structures. The pulse contains about 70000 bunches, one in every second rf bucket, and has a length of 140 $\mu$s. The beam stability along the beamline is of concern for such a high current and pulse length. We present different options for the lattice of the linac based on FODO, triplet and doublet cells and compare the transverse instability for each lattice including the effects of beam jitter, alignment and beam-based correction. Additionally longitudinal stability is discussed for different bunch compressors using FODO type of lattice.