Interplay of space charge, intrabeam scattering and synchrotron radiation in the Compact Linear Collider damping rings

TL;DR

This paper investigates how synchrotron radiation, intra-beam scattering, and space charge effects interact in the CLIC damping rings, using new simulation algorithms to optimize beam stability and performance.

Contribution

The paper introduces two algorithms integrated into PyORBIT for simulating IBS and synchrotron radiation effects, enhancing understanding of collective effects in damping rings.

Findings

Synchrotron radiation damping reduces adverse effects of IBS and space charge.

Careful working point selection is crucial to avoid resonance-induced losses.

Full dynamic simulations show the importance of lattice tuning for beam stability.

Abstract

Future ultra-low emittance rings for electron/positron colliders require extremely high beam brightness and can thus be limited by collective effects. In this paper, the interplay of effects such as synchrotron radiation, intra-beam scattering (IBS) and space charge in the vicinity of excited betatron resonances is assessed. In this respect, two algorithms were developed to simulate IBS and synchrotron radiation effects and integrated in the PyORBIT tracking code, to be combined with its widely used space charge module. The impact of these effects on the achievable beam parameters of the Compact Linear Collider (CLIC) Damping Rings was studied, showing that synchrotron radiation damping mitigates the adverse effects of IBS and space charge induced resonance crossing. The studies include also a full dynamic simulation of the CLIC damping ring cycle starting from the injection beam parameters. It is demonstrated that a careful working point choice is necessary, in order to accommodate the transition from a non-linear lattice induced detuning to a space-charge dominated one and thereby avoid excessive losses and emittance growth generated in the vicinity of strong resonances.