Speaker
Description
NSRRC has been dedicated to providing the superradiant THz free electron laser (FEL) for scientific research users in recent years. Linac-based coherent superradiant THz FELs produced by the NSRRC high brightness photoinjector, which has been installed in the Accelerator Test Area (ATA), is served for users. Users in different research fields have different requirements for THz FEL specifications, such as THz energy, THz frequency and so on. In general, changing the undulator gap is the common method to tune the frequency. However, in the photoinjector system, frequency tunability of superradiant THz FELs can also be achieved by changing the electron energy through varying rf power injected into the linac and correspondingly generating ultrashort electron beams with different bunch length by velocity bunching technique. In this report, the demonstration of the frequency-tunable superradiant THz FEL covering the range from 0.4 to 2 THz is presented.
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