Demonstration of transport of a patterned electron beam produced by diamond pyramid cathode in an rf gun

• Published in: Applied physics letters Vol. 116; no. 2
• Main Authors: Nichols, K. E., Andrews, H. L., Kim, D., Simakov, E. I., Conde, M., Doran, D. S., Ha, G., Liu, W., Power, J. F., Shao, J., Whiteford, C., Wisniewski, E. E., Antipov, S. P., Chen, G.
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 13-01-2020
• Subjects: Applied physics; Arrays; Cathodes; Diamonds; Electron beams; Electrons; Emitters; Emitters (electron); Pyramids; Transport
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.5128109

We have demonstrated generation and transport of a patterned electron beam from a Diamond Field-Emitter Array (DFEA) cathode in a radio frequency (rf) gun. DFEAs are arrays of micrometer-scale pyramids with nanometer-scale tips. They can be fabricated with base widths ranging from 3 μm to 25 μm and pitches as small as 5 μm. They have an inherent 1:0.7 base to height ratio. DFEAs operate as field-emitter cathodes and potentially produce intrinsically shaped electron beams, which are of interest for a number of accelerator applications. We report on the results of a recent experiment in which a beam, consisting of several beamlets, was produced from a DFEA cathode in an rf gun and transported 2.54 m along a beam line. A macrobunch charge of 60 pC was measured at a cathode field gradient of 15.1 MV/m.