High Power THz Undulator Radiation from Linear Accelerator

A 30-MeV femto-second electron linac is built at the Shanghai Institute of Applied Physics, which can produce high power, coherent THz undulator radiation. We report the experimental facility and measurement of the power, frequency spectrum. First experiments show the averaged power at THz to be about 20mW.     

Characterizing THz Coherent Synchrotron Radiation at Femtosecond Linear Accelerator

The generation and observation of coherent THz synchrotron radiation from femtosecond electron bunches in the Shanghai Institute of Applied Physics femtosecond accelerator device is reported. We describe the experiment setup and present the first result of THz radiation properties such as power and spectrum.     

Preliminary result of bunch length measurement using a modified Michelson interferometer

Based on the femtosecond accelerator device which was built at the Shanghai Institute of Applied Physics （SINAP）, recently a modified far infrared Michelson interferometer has been developed to measure the length of electron bunches via the optical autocorrelation method. Compared with our former normal Michelson interferometer, we use a hollow retroreflector instead of a flat mirror as the reflective mirror. The experimental setup and results of the bunch length measurement will be described in this paper.     

532nm激光照射碳纳米管光场致发射电子枪(英文)

报道了碳纳米管光场致发射电子枪的初步研究结果。在532nm激光照射下碳纳米管光场致发射电子枪在极间高压为27kV时得到的最大的脉冲流强可以达到3.364A,其脉冲电流发射密度可达6.728A/cm2,对应脉冲电荷量为38.7nC。碳纳米管的量子效率通过公式计算为3.73×10-5,给出了在532nm激光照射下碳纳米管光场致发射电子枪发射电流随激光功率和极间电压的变化关系。