Design studies on a 500 kV DC gun photo-injector for the BXERL test facility

LIU Sheng-Guang; XU Jin-Qiang

doi:10.1088/1674-1137/35/1/018

Chinese Physics C> 2011, Vol. 35> Issue(1) : 88-91 DOI: 10.1088/1674-1137/35/1/018

Design studies on a 500 kV DC gun photo-injector for the BXERL test facility

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Abstract：
BXERL is a proposal for a test facility (Beijing X-ray Energy Recovery Linac), which requires its injector to provide an electron beam of 5 MeV, 77 pC/ bunch at a repetition rate of 130 MHz (average current of 10 mA). In this paper, we present the design of the injector, which consists of a 500 kV photocathode DC gun equipped with a GaAs cathode preparation device, a 1.3 GHz normal conducting RF buncher, two solenoids, and one cryomodule containing two 1.3 GHz 2-cell superconducting RF cavities as the energy booster. The detailed beam dynamics show that the injector can generate electron bunches with a RMS normalized emittance of 1.49 πmm·mrad, a bunch length of 0.67 mm, a beam energy of 5 MeV and an energy spread of 0.72%.

References

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Neil G R et al. Phys. Rev. Lett., 2000, 84: 6622 Hajima R et al. First Demonstration of Energy-Recovery Operation in the JAERI supper conducting Linac for a High-Power Free-Electron Laser, Proceedings of FEL2002, USA, 1153 Antokhin E A et al. Nucl. Instrum. Methods A, 2004, 528: 154 Ben-Zvi I. The ERL High-Energy Cooler for RHIC, Proceedings of EPAC06, Scotland, 9405 Derbenev Y S et al. Proceedings of EPAC04, Switzerland, 8936 Gruner S M et al. Rev. Sci. Instrum., 2002, 73: 14027 Baptiste K et al. Nucl. Instrum. Methods A, 2009, 599: 98 Overview of the present status of the SRF gun design and construction, CARE Note-2004-010-ELAN, Germany9 Ben-Zvi I et al. Nucl. Instrum. Methods A, 2006, 557: 33710 McKenzie J W et al. Injector design for the 4GLS high average current loop, Proceedings of PAC07, USA, 110011 Ivan V Bazarov et al. Phys. Rev. ST Accel. Beams, 2005, 8: 03420212 LIU H et al. Nucl. Instrum. Methods A, 1995, 358: 475

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LIU Sheng-Guang and XU Jin-Qiang. Design studies on a 500 kV DC gun photo-injector for the BXERL test facility[J]. Chinese Physics C, 2011, 35(1): 88-91. doi: 10.1088/1674-1137/35/1/018

LIU Sheng-Guang and XU Jin-Qiang. Design studies on a 500 kV DC gun photo-injector for the BXERL test facility[J]. Chinese Physics C, 2011, 35(1): 88-91. doi: 10.1088/1674-1137/35/1/018 shu

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Received: 2010-04-24
Revised: 2010-06-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Design studies on a 500 kV DC gun photo-injector for the BXERL test facility

LIU Sheng-Guang
XU Jin-Qiang

Received Date: 2010-04-24
Accepted Date: 2010-06-01
Available Online: 2011-01-05

Abstract: BXERL is a proposal for a test facility (Beijing X-ray Energy Recovery Linac), which requires its injector to provide an electron beam of 5 MeV, 77 pC/ bunch at a repetition rate of 130 MHz (average current of 10 mA). In this paper, we present the design of the injector, which consists of a 500 kV photocathode DC gun equipped with a GaAs cathode preparation device, a 1.3 GHz normal conducting RF buncher, two solenoids, and one cryomodule containing two 1.3 GHz 2-cell superconducting RF cavities as the energy booster. The detailed beam dynamics show that the injector can generate electron bunches with a RMS normalized emittance of 1.49 πmm·mrad, a bunch length of 0.67 mm, a beam energy of 5 MeV and an energy spread of 0.72%.