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| Title | Review of Experimental Results from High Brightness DC Guns: Highlights in FEL Applications | |||||
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| Abstract | Future ERL light sources and high repetition rate X-ray FELs require high-brightness and high-current electron guns. A DC photoemission gun is one of the most promising candidates for such guns, because a record high current of 65 mA and generation of high brightness beam with 90% normalized emittances of 0.3 mm-mrad with bunch charge of 77 pC were recently demonstrated at the Cornell photoinjector with a 350 kV photoemission gun [1,2]. Further increase of the gun high voltage is desirable to reduce space charge induced emittance growth especially for high bunch charge application such as X-ray FEL. Employment of a segmented insulator is a key to reach higher voltage [3]. This technique led to generation of 500 keV beam from the JAEA gun with 160mm acceleration gap [4], conditioning voltage more than 500 kV at the Cornell gun with gap < 50 mm [5], and demonstration of 500 kV holding for 10 hours at the KEK gun with 70 mm gap [6]. In this talk, we present recent experimental results of high brightness DC guns and discuss highlights and limitations in FEL applications. | |||||
| Footnotes & References | [1] Dunham, APL 102, 034105. [2] Gulliford, PRSTAB 16, 073401. [3] Nagai, RSI 81, 033304. [4] Nishimori, APL 102, 234103. [5] Maxson, RSI 85, 093306. [6] Yamamoto, private communication. |
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| Funding | This work is partially supported by a JSPS Grant-in-Aid for Scientific Research in Japan (15H03594). | |||||
| Paper | download MOD01.PDF [0.871 MB / 5 pages] | |||||
| Slides | download MOD01_TALK.PDF [3.051 MB] | |||||
| Conference | FEL2015, Daejeon, Republic of Korea | |||||
| Series | International Free Electron Laser Conference (37th) | |||||
| Proceedings | Link to full FEL2015 Proccedings | |||||
| Session | FEL Technology & Hardware: Gun, RF, Laser, Cathodes | |||||
| Date | 24-Aug-15 17:00–18:30 | |||||
| Main Classification | FEL Technology and HW: Gun, RF, Laser, Cathodes | |||||
| Keywords | gun, cathode, emittance, FEL, brightness | |||||
| Publisher | JACoW, Geneva, Switzerland | |||||
| Editors | Heung-Sik Kang (PAL, Pohang, Republic of Korea); Dong Eon Kim (PAL, Pohang, Republic of Korea); Volker RW Schaa (GSI, Darmstadt, Germany); | |||||
| ISBN | 978-3-95450-134-2 | |||||
| Published | December 2015 | |||||
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