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Particles 2018, 1(1), 166-174; https://doi.org/10.3390/particles1010012

Development of a Multialkali Photocathode Dc Gun for a Smith-Purcell Terahertz Free-Electron Laser

1
National Institutes for Quantum and Radilological Science and Technology, 1-1-1 Kouto Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
2
National Institutes for Quantum and Radilological Science and Technology, Tokai-mura, Naka-gun, Ibaraki 319-1106, Japan
*
Author to whom correspondence should be addressed.
Received: 25 June 2018 / Revised: 9 July 2018 / Accepted: 11 July 2018 / Published: 13 July 2018
(This article belongs to the Special Issue Superradiances from Ultra Short Electron Bunch Beam)
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Abstract

We have developed a photocathode dc gun for a compact Smith-Purcell free-electron laser in the terahertz wavelength region. The gun system consists of an alkali antimonide photocathode preparation chamber, a dc gun with a 250 kV-50 mA Cockcroft-Walton high-voltage power supply, and a downstream beamline with a water-cooled beam dump to accommodate a beam power of 5 kW. We fabricated a Cs3Sb photocathode with quantum efficiency of 5.8% at a wavelength of 532 nm and generated a 150 keV beam with current of up to 4.3 mA with a 500 mW laser. A vacuum chamber for the Smith-Purcell free-electron laser has been installed in the downstream beamline. We describe the present status of our work. View Full-Text
Keywords: photoemission dc gun; Smith-Purcell radiation; free-electron laser photoemission dc gun; Smith-Purcell radiation; free-electron laser
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nishimori, N.; Nagai, R.; Sawamura, M.; Hajima, R. Development of a Multialkali Photocathode Dc Gun for a Smith-Purcell Terahertz Free-Electron Laser. Particles 2018, 1, 166-174.

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