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 m...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%.展开更多
A proposed compact ERL test facility at IHEP, Beijing, is presented in this paper, and includes the design parameters, the essential lattice, and the key components features, such as the photocathode DC gun and the CW...A proposed compact ERL test facility at IHEP, Beijing, is presented in this paper, and includes the design parameters, the essential lattice, and the key components features, such as the photocathode DC gun and the CW superconducting accelerating structures. Some important beam physics issues such as the space charge effect, the coherent synchrotron radiation （CSR） effect and the beam break-up （BBU） effect are briefly described with the simulation results.展开更多
In this paper, we the design study of a L-band DC photocathode gun injector for the ERL （Energy Recovery Linac） test facility. The main parameters of the injector are energy of 2.3 MeV, a bunch length of 2 ps, and a...In this paper, we the design study of a L-band DC photocathode gun injector for the ERL （Energy Recovery Linac） test facility. The main parameters of the injector are energy of 2.3 MeV, a bunch length of 2 ps, and a normalized emittance of 2.1 mm.mrad.展开更多
An EC-ITC （External-Cathode Independently Tunable Cells） RF gun was employed with the aim of obtaining short-pulse bunches with high peak current for a terahertz radiation source. A gridded DC gun plays a key role a...An EC-ITC （External-Cathode Independently Tunable Cells） RF gun was employed with the aim of obtaining short-pulse bunches with high peak current for a terahertz radiation source. A gridded DC gun plays a key role as the external injecting electron source of the ITC RF gun, the performance of which determines the beam quality in the injector and transport line. In order to make the beam well compressed in the ITC RF gun, the energy of the electrons acquired from the gridded DC gun should be 15 keV at most. A proper structure of the gridded gun with double-anode is shown to overcome the strong space- charge force on the cathode, which is able to generate 6 μs beam with 4.5 A current successfully.展开更多
直流-射频超导(direct current-superconducting radio frequency,DC-SRF)光阴极电子枪是由北京大学射频超导加速器实验室提出并发展的一种连续波电子源,可产生MHz及以上重复频率、皮秒至亚皮秒脉冲、Me V能量的电子束.作为一类重要的...直流-射频超导(direct current-superconducting radio frequency,DC-SRF)光阴极电子枪是由北京大学射频超导加速器实验室提出并发展的一种连续波电子源,可产生MHz及以上重复频率、皮秒至亚皮秒脉冲、Me V能量的电子束.作为一类重要的超导型光阴极电子枪,DC-SRF将具有高量子效率的半导体光阴极与射频超导加速腔分离,成功地解决了二者之间的兼容问题,并具有结构紧凑、暗电流低等优点.DC-SRF光阴极电子枪的研发经历了样机、DC-SRF-I及DC-SRF-II三个阶段,其中,DC-SRF-I于2014年实现稳定载束运行,并开展了系列应用实验;DCSRF-II于2021年建成,2022年实现100 p C束团电荷量、1 MHz重复频率的连续波模式运行,暗电流小于1 pA,归一化发射度达到亚mm-mrad级,综合性能指标处于领先地位.本文总结DC-SRF电子枪的研究工作,主要内容包括DCSRF-I电子枪、DC-SRF-II电子枪、光阴极与驱动激光等.展开更多
基金Supported by Creative Research Foundation of Institute of High Energy Physics (H85453G0U2)Key Project of Chinese National Programs for Fundamental Research and Development (2008CB817700)
文摘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%.
文摘A proposed compact ERL test facility at IHEP, Beijing, is presented in this paper, and includes the design parameters, the essential lattice, and the key components features, such as the photocathode DC gun and the CW superconducting accelerating structures. Some important beam physics issues such as the space charge effect, the coherent synchrotron radiation （CSR） effect and the beam break-up （BBU） effect are briefly described with the simulation results.
文摘In this paper, we the design study of a L-band DC photocathode gun injector for the ERL （Energy Recovery Linac） test facility. The main parameters of the injector are energy of 2.3 MeV, a bunch length of 2 ps, and a normalized emittance of 2.1 mm.mrad.
基金Supported by National Natural Science Foundation of China(10875116)
文摘An EC-ITC （External-Cathode Independently Tunable Cells） RF gun was employed with the aim of obtaining short-pulse bunches with high peak current for a terahertz radiation source. A gridded DC gun plays a key role as the external injecting electron source of the ITC RF gun, the performance of which determines the beam quality in the injector and transport line. In order to make the beam well compressed in the ITC RF gun, the energy of the electrons acquired from the gridded DC gun should be 15 keV at most. A proper structure of the gridded gun with double-anode is shown to overcome the strong space- charge force on the cathode, which is able to generate 6 μs beam with 4.5 A current successfully.
文摘直流-射频超导(direct current-superconducting radio frequency,DC-SRF)光阴极电子枪是由北京大学射频超导加速器实验室提出并发展的一种连续波电子源,可产生MHz及以上重复频率、皮秒至亚皮秒脉冲、Me V能量的电子束.作为一类重要的超导型光阴极电子枪,DC-SRF将具有高量子效率的半导体光阴极与射频超导加速腔分离,成功地解决了二者之间的兼容问题,并具有结构紧凑、暗电流低等优点.DC-SRF光阴极电子枪的研发经历了样机、DC-SRF-I及DC-SRF-II三个阶段,其中,DC-SRF-I于2014年实现稳定载束运行,并开展了系列应用实验;DCSRF-II于2021年建成,2022年实现100 p C束团电荷量、1 MHz重复频率的连续波模式运行,暗电流小于1 pA,归一化发射度达到亚mm-mrad级,综合性能指标处于领先地位.本文总结DC-SRF电子枪的研究工作,主要内容包括DCSRF-I电子枪、DC-SRF-II电子枪、光阴极与驱动激光等.
