Abstract
We report the design and optimization of a femtosecond electron diffraction instrument with megahertz repetition-rate. The proposed instrument is mainly based on the photoinjector of the Chinese Academy of Engineering Physics Terahertz free electron laser facility, which merges a 320 kV DC photocathode gun with two 4-cell super-conducting linac operating at 1.3 GHz. Simulations show that high quality electron probes with fC charge, ultralow emittance, and femtosecond scale bunch duration can be generated. Together with the capability of operating at continuous wave mode, this instrument is well matched with the demand of future electron diffraction.
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