Experimental investigations of DC-SC photoinjector at Peking University

We report the progress of the DC-SC photoinjector at Peking University. This is a compact electron gun integrating a DC Pierce gun with a 1.3 GHz superconducting cavity. The photoinjector is designed to provide an electron beam having an average current of 1 mA with the energy of 2.61 MeV and normalized rms transverse emittance of 3 mm mrad. The test facility has been completely installed in our laboratory. The photocathode preparation chamber can produce Cs2Te and Cs3Sb cathodes, and the laser system can provide laser pulses with 532 or 266 nm wavelength at an 81.25 MHz repetition rate. The timing jitter of less than 1 ps between the laser and RF power has been achieved by using a timing stabilizer. A new method using "duo image pattern" of Cherenkov radiation will be commissioned to measure beam emittance. This paper summarizes some of the ongoing experimental activities. (C) 2004 Elsevier B.V. All rights reserved.Instruments & InstrumentationNuclear Science & TechnologyPhysics, Particles & FieldsSpectroscopySCI(E)EICPCI-S(ISTP)