PAC2013 - List of Authors (Swent, R.)

Paper	Title	Page
THPAC19	Temperature Dependence of Photoemission from Copper and Niobium	1184
	J.R. Harris CSU, Fort Collins, Colorado, USA C.W. Bennett, M.D. Galt, A.D. Holmes, A. Kara, R. Swent NPS, Monterey, California, USA J.W. Lewellen LANL, Los Alamos, New Mexico, USA J. Sears Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: This work was funded by the Office of Naval Research and the High Energy Laser Joint Technology Office. Photocathodes remain the principal electron sources for many particle accelerators. With the increasing interest in the use of superconducting radiofrequency electron guns, it is important to understand how operation at cryogenic temperatures affects the performance of photocathodes. Here we report measurements of the quantum efficiency of copper and niobium under illumination with 266 nm light at temperatures between 85K and 400K. The quantum efficiency of copper was found to vary strongly over this range, while there was only a minimal change in the quantum efficiency of niobium.

Paper

Title

Page

Temperature Dependence of Photoemission from Copper and Niobium

1184

J.R. Harris
CSU, Fort Collins, Colorado, USA
C.W. Bennett, M.D. Galt, A.D. Holmes, A. Kara, R. Swent
NPS, Monterey, California, USA
J.W. Lewellen
LANL, Los Alamos, New Mexico, USA
J. Sears
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: This work was funded by the Office of Naval Research and the High Energy Laser Joint Technology Office.
Photocathodes remain the principal electron sources for many particle accelerators. With the increasing interest in the use of superconducting radiofrequency electron guns, it is important to understand how operation at cryogenic temperatures affects the performance of photocathodes. Here we report measurements of the quantum efficiency of copper and niobium under illumination with 266 nm light at temperatures between 85K and 400K. The quantum efficiency of copper was found to vary strongly over this range, while there was only a minimal change in the quantum efficiency of niobium.