CeB₆ electron gun for the soft X-ray FEL project at SPring-8

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• 作者：Togawa ; K. ; Baba ; H. ; Onoe ; K. ; Inagaki ; T. ; Shintake ; T. ; Matsumoto ; H.
• 关键词：41.60.Cr ; FEL ; X-ray laser ; Low emittance ; Electron gun ; CeB₆ cathode
• 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
• 出版年：2004
• 期刊代码：41_01689002
• 类别：ph
• 出版时间：August 1, 2004
• 卷：528
• 期：1-2
• 页码：312-315
• 文件大小：403 K

摘要

A pulsed high-voltage electron gun with a thermionic cathode is under development for the injector system of the soft X-ray FEL project at SPring-8 (SCSS project). A CeB₆ single crystal of 3mm diameter was chosen as a thermionic cathode because of its excellent emission properties, i.e., high resistance against contamination, uniform emission density and smooth surface. The CeB₆ cathode can produce a 3A beam with 2μs FWHM. A gun voltage of −500kV was chosen as a compromise between the need for controlling emittance growth and minimizing the risks of high-voltage arcing. We have constructed a 500kV electron gun test stand and have begun performance tests. This paper describes the basic design and the current status of the hardware R&D on the CeB₆ gun.