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TY - CONF AU - Nishimori, N. AU - Hajima, R. AU - Nagai, R. AU - Sawamura, M. ED - Ramberger, Suitbert ED - Draper, Mick ED - Schaa, Volker RW TI - Development of a Multialkali Photocathode DC Gun for High Current Operation J2 - Proc. of ERL2017, Geneva, Switzerland, June 18-23, 2017 C1 - Geneva, Switzerland T2 - ICFA Advanced Beam Dynamics Workshop T3 - 59 LA - english AB - We have developed a DC gun test stand at National Institutes for Quantum Radiological Science and Technology (QST) for high current electron beam generation. The gun test stand consists of an alkali antimonide photocathode preparation chamber, a DC gun with a 250kV-50mA Cockcroft Walton high voltage power supply, and beam line with a water cooled beam dump to accommodate 1.5 kW beam power. We successfully fabricated a Cs₃Sb photocathode with quantum efficiency of 5.8 % at 532 nm wavelength and generated 150 keV beam with current up to 4.3 mA with 500 mW laser at 532 nm wavelength. Unfortunately, we encountered a vacuum incident during beam transport of high current beam and the development has been halted. We will fix the vacuum problem and restart the gun development as soon as possible. PB - JACoW Publishing CP - Geneva, Switzerland SP - 29 EP - 32 KW - gun KW - cathode KW - laser KW - vacuum KW - high-voltage DA - 2018/05 PY - 2018 SN - 978-3-95450-190-8 DO - 10.18429/JACoW-ERL2017-MOPSPP015 UR - http://jacow.org/erl2017/papers/mopspp015.pdf ER -