CAEP/IAE, Mianyang, Sichuan
IAP, Beijing
After the first lasing in March 2005 in CAEP, the FEL-THz facility is updated ,the former thermionic cathode injector was replaced using a high brightness photo-cathode injector. The facility mainly consists of a 4.5cells photo-cathode RF-GUN injector ,a hybrid undulator and the optical oscillator cavity. Number of undulator periods is 44, the peak value of the undulator is 4900Gs ,the good aperture is 6mm .The cathode material is Cs2Te and the quadruple light is used , the width of the driving laser is 12ps， the quantum efficiency is about 1%. The commissioning of the injector is finished, the electron energy of the injector was measured and it is about 8MeV ,the energy spread is about 1% and the electron beam normalized emittance is about 9πmm.mrad. The charge is about 100pC and up to 1nC per micro-pulse , the repetition rate is 54.167MHz .The calculated wavelength of the light is about 125micron. At present ,the spontaneous emission experiment is undertaking .
