Work

Microwave instability driven by terahertz-scale resistive-wall impedance in electron synchrotrons

Year: 2024

Type: article

Abstract: Vacuum vessels of many existing and planned synchrotron light sources feature metallic coatings . In some combinations, they might cause a resonator-like peak in the longitudinal impedance. In this simulation study, we demonstrate how different parameters of non-evaporable getter (NEG) can increase momentum-spread growth and, hence, reduce microwave-instability thresholds. The first key insight of this study: The spread of the coating-layer thickness amongst vacuum vessels results in significantly reduced momentum-spread growth. Therefore, we recommend including randomised coating when designing vacuum components and modelling the impedance for a synchrotron light source. The second key insight of this study: Insertion devices featuring rectangular geometry and NEG coating might cause a multi-peak structure of the longitudinal impedance which can drive additional momentum-spread growth.

Source: Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

DOI: 10.1016/j.nima.2024.170147

Authors: Dmitrii Rabusov, Ian P.S. Martin, Siwei Wang, Richard T. Fielder

Institutions: Diamond Light Source, University of Oxford

Language: English

Topic: Particle accelerators and beam dynamics

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,690

OpenAlex ID: W4405220924

FWCI: 0.356

Cites: 17

Cited by: 2

Related to: 10