A cryogenically cooled 200 kV DC photoemission electron gun for ultralow emittance photocathodes.

Autor:	Gevorkyan G; Department of Physics, Arizona State University, 550 E Tyler Mall PSF-470, Tempe, Arizona 85287, USA., Sarabia-Cardenas C; Department of Physics, Arizona State University, 550 E Tyler Mall PSF-470, Tempe, Arizona 85287, USA., Kachwala A; Department of Physics, Arizona State University, 550 E Tyler Mall PSF-470, Tempe, Arizona 85287, USA., Knill C; Department of Physics, Arizona State University, 550 E Tyler Mall PSF-470, Tempe, Arizona 85287, USA., Hanks TJ; Department of Physics, Arizona State University, 550 E Tyler Mall PSF-470, Tempe, Arizona 85287, USA., Bhattacharyya P; Department of Physics, Arizona State University, 550 E Tyler Mall PSF-470, Tempe, Arizona 85287, USA., Li WH; Accelerator Test Facility, Brookhaven National Laboratory, Bldg. 820M, P.O. Box 5000, Upton, New York 11973-5000, USA., Cultrera L; Instrumentation Division, Brookhaven National Laboratory, Bldg. 535, P.O. Box 5000, Upton, New York 11973-5000, USA., Galdi A; Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy., Bazarov I; Department of Physics, Cornell University, 142 Sciences Dr, Ithaca, New York 14850, USA., Maxson J; Department of Physics, Cornell University, 142 Sciences Dr, Ithaca, New York 14850, USA., Karkare S; Department of Physics, Arizona State University, 550 E Tyler Mall PSF-470, Tempe, Arizona 85287, USA.
Jazyk:	angličtina
Zdroj:	The Review of scientific instruments [Rev Sci Instrum] 2023 Sep 01; Vol. 94 (9).
DOI:	10.1063/5.0160818
Abstrakt:	Novel photocathode materials like ordered surfaces of single crystal metals, epitaxially grown high quantum efficiency thin films, and topologically non-trivial materials with dirac cones show great promise for generating brighter electron beams for various accelerator and ultrafast electron scattering applications. Despite several materials being identified as brighter photocathodes, none of them have been tested in electron guns to extract electron beams due to technical and logistical challenges. In this paper, we present the design and commissioning of a cryocooled 200 kV DC electron gun that is capable of testing a wide variety of novel photocathode materials over a broad range of temperatures from 298 to 35 K for bright electron beam generation. This gun is designed to enable easy transfer of the photocathode to various standard ultra-high-vacuum surface diagnostics and preparation techniques, allowing a full characterization of the dependence of beam brightness on the photocathode material and surface properties. We demonstrate the development of such a high-voltage, high-gradient gun using materials and equipment that are easily available in any standard university lab, making the development of such 200 kV electron guns more accessible. (© 2023 Author(s). Published under an exclusive license by AIP Publishing.)
Databáze:	MEDLINE
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