Zhu Junbiao, Zhang Guoqing, Li Yonggui, Xie Jialin
Institute of High Energy Physics, Beijing, China
With a train of electron bunches passing through a bending magnet being considered as a multi-slit optical grating from which multi beams of coherent radiation emitted with definite phase deference, the interference between coherent synchrotron radiation emitted from consecutive bunches accelerated by the BFEL 30MeV RF-linac is analyzed and numerically calculated. From the discussions it follows that: 1. Interference originated from coherence between separate bunches whose lengths are shorter than radiation wavelength; 2. Rapidly oscillating radiation enhancement due to coherence between bunches is superposed on the single bunch power spectrum; 3. Such radiation enhancement consists of a series of spectrum lines corresponding to the higher harmonics of the fundamental frequency, radio frequency of the linac; 4. Intensity enhancement is about as high as the number of bunches in a macropulse. Experimental design to measure interference from separate bunches at the BFEL Linac with the developed mm-wave Michelson interferometer is presented.
