Chamber Surface Roughness and Electron Cloud for the Advanced Photon Source Superconducting Undulator

TL;DR

This study investigates how surface roughness, temperature, photon energy, and angle affect photoemission in the APS superconducting undulator to better understand primary electron generation and its impact on electron cloud formation.

Contribution

It provides experimental data on photoemission parameters of aluminum vacuum chamber samples under various conditions relevant to the APS.

Findings

Surface roughness influences photoelectron yield.

Photon energy and angle significantly affect photoemission spectra.

Temperature variations impact photoemission characteristics.

Abstract

The electron cloud is a possible heat source in the superconducting undulator (SCU) designed for the Advanced Photon Source (APS), a 7-GeV electron synchrotron radiation source at Argonne National Laboratory. In electron cloud generation extensive research has been done, and is continuing, to understand the secondary electron component. However, little work has been done to understand the parameters of photoemission in the accelerator environment. To better understand the primary electron generation in the APS; a beamline at the Australian Light Source synchrotron was used to characterize two samples of the Al APS vacuum chamber. The total photoelectron yield and the photoemission spectra were measured. Four parameters were varied: surface roughness, sample temperature, incident photon energy, and incident photon angle, with their results presented here.