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

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