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Persistent URL http://purl.org/net/epubs/work/10855541
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Record Id 10855541
Title ERL09 WG1 Summary: DC Gun technological challenges
Abstract This paper summarizes technological challenges of photoemission DC guns being developed for the future energy recovery linac (ERL) light sources (LS). Anticipated new applications of ERL-LS demand an electron gun capable of producing an extremely low emittance beam at very high average current. The low emittance requires unprecedentedly high voltage equal to or greater than 500 kV between cathode/anode electrodes together with high accelerating gradient on the photocathode. The technological challenge is to develop a high voltage insulator system, which can withstand field emission from the electrodes. A high voltage processing technique and a challenge to suppress field emission are discussed. The high average current requires prolonged cathode life time, which is governed by ion backbombardment. Challenges to mitigate the cathode damage caused by ion back-bompardment are surveyed. We also discuss high voltage power supply which can afford sufficient high average current, load-lock system capable of accomodating quick cathode exchange to minimize accelerator down time, and vacum technology to suppress both field emission and ion back-bombardment. A gun geometry satisfying both high gun voltage and high accelerating gradient is also proposed.
Organisation ASTeC , ASTeC-AP , STFC
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Language English (EN)
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Paper In Conference Proceedings In Energy Recovery Linac Workshop (ERL09), Cornell University, Ithaca, New York, U.S.A., June 08-12, CI Preprints (2009): 6-23. 2009 Proc. ERL09 …gical Challenges.pdf 2009