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Title	Photoemission Properties of LaB6 and CeB6 Under Various Temperature and Incident Photon Energy Conditions
Authors	K. Morita, T. Katsurayama, T. Kii, K. Masuda, T. Murata, K. Nagasaki, T. Nogi, H. Ohgaki, S. Suphakul, K. Torgasin, H. Yamashita, H. Zen Kyoto University, Kyoto, Japan
Abstract	Re­cently, thermionic cath­ode ma­te­ri­als such as LaB6, Ir5Ce and dis­penser cath­odes have been also used as pho­to­cath­ode since they have low work func­tion, rea­son­ably high quan­tum ef­fi­ciency, and long life­time*,**. How­ever, the ef­fect of cath­ode tem­per­a­ture and laser wave­length on quan­tum ef­fi­ciency is known only for lim­ited con­di­tions. Al­though it is ex­pected to be able to lengthen the re­quired wave­length of pho­to­cath­ode drive laser by heat­ing cath­odes, laser with pho­ton en­ergy under the work func­tion has not been tested. Re­veal­ing them en­ables us to de­sign the cost min­i­mum ac­cel­er­a­tors. In this re­search, pho­toe­mis­sion prop­er­ties of LaB6 and CeB6 with var­i­ous ex­ci­ta­tion pho­ton en­er­gies will be in­ves­ti­gated under var­i­ous tem­per­a­tures of the ma­te­ri­als. Those ma­te­ri­als have sim­i­lar work func­tion, but CeB6 have one order of mag­ni­tude smaller Richard­son con­stant than LaB6***. By com­par­ing pho­toe­mis­sion prop­er­ties of these ma­te­ri­als, im­pact of Richard­son con­stant on the pho­toe­mis­sion prop­er­ties will be in­ves­ti­gated.
Footnotes & References	* S. Thorin et al. Proc of FEL2009, 310 ** D. Satoh et al. Proc of IPAC2014, 679 *** J.M. Lafferty, J. Appl. Phys. 22, (1951), 299
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Conference	IPAC2016, Busan, Korea
Series	International Particle Accelerator Conference (7th)
Proceedings	Link to full IPAC2016 Proccedings
Session	Contributed Orals, Particle Sources and Alternative Acceleration Techniques
Date	11-May-16   09:30–10:30
Main Classification	03 Alternative Particle Sources and Acceleration Techniques
Sub Classification	T02 Electron Sources
Keywords	cathode, laser, photon, electron, vacuum
Publisher	JACoW, Geneva, Switzerland
Editors	Christine Petit-Jean-Genaz (CERN, Geneva, Switzerland); Dong Eon Kim (PAL, Pohang, Republic of Korea); Kyung Sook Kim (PAL, Pohang, Republic of Korea); In Soo Ko (POSTECH, Pohang, Republic of Korea); Volker RW Schaa (GSI, Darmstadt, Germany)
ISBN	978-3-95450-147-2
Published	June 2016
Copyright	Copyright © 2016 by JACoW, Geneva, Switzerland     cc Creative Commons Attribution 3.0