CERN Accelerating science

Article
Title	Measurement of the Secondary Emission Yield of a Thin Diamond Window in Transmission Mode
Author(s)	Chang, Xiangyun ; Ben-Zvi, Ilan ; Burrill, Andrew ; Hulbert, Steve ; Johnson, Peter ; Kewisch, Jorg ; Rao, Triveni ; Segalov, Zvi ; Smedley, John ; Zhao, Yongxiang
Affiliation	(BNL, Upton, Long Island, New York) ; (BNL/NSLS, Upton, Long Island, New York)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2251
Subject category	Accelerators and Storage Rings
Abstract	The secondary emission enhanced photoinjector (SEEP) is a promising new approach to the generation of high-current, high-brightness electron beams. A low current primary electron beam with energy of a few thousand electron-volts strikes a specially prepared diamond window which emits secondary electrons with a current two orders of magnitude higher. The secondary electrons are created at the back side of the diamond and drift through the window under the influence of a strong electrical field. A hydrogen termination at the exit surface of the window creates a negative electron affinity (NEA) which allows the electrons to leave the diamond. An experiment was performed to measure the secondary electron yield and other properties. The results are discussed in this paper.