|MOD01||Review of Experimental Results from High Brightness DC Guns: Highlights in FEL Applications||269|
Funding: This work is partially supported by a JSPS Grant-in-Aid for Scientific Research in Japan (15H03594).
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 . This technique led to generation of 500 keV beam from the JAEA gun with 160mm acceleration gap , conditioning voltage more than 500 kV at the Cornell gun with gap < 50 mm , and demonstration of 500 kV holding for 10 hours at the KEK gun with 70 mm gap . In this talk, we present recent experimental results of high brightness DC guns and discuss highlights and limitations in FEL applications.
 Dunham, APL 102, 034105.
 Gulliford, PRSTAB 16, 073401.
 Nagai, RSI 81, 033304.
 Nishimori, APL 102, 234103.
 Maxson, RSI 85, 093306.
 Yamamoto, private communication.
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