Fig. 1. Form factor of ultrashort electron beams with Gaussian distribution

Fig. 2. Form factor of electron micro-bunch trains with 50 fs micro-bunch length

Fig. 3. Layout of TTX beamline

Fig. 4. Setup of THz new beamline

Fig. 5. Photo of THz new beamline

Fig. 6. Experimental result of THz electron bunch train generation by nonlinear space charge oscillation^[36]

Fig. 7. Simulation results of THz electron bunch train generation by segmented hollow plasma channels^[38]

Fig. 8. Schematic layout of THz electron bunch train generation by slice energy spread modulation^[39]

Fig. 9. Spectrums of coherent Smith-Purcell radiation and coherent transition radiation emitted by THz electron bunch train^[41]

Fig. 10. Measurement results of first three harmonics of coherent Smith-Purcell radiation^[42]

Fig. 11. Spectrum measurement of undulator radiation^[44]

Fig. 12. Experimental setup of THz wakefield generation by electron beam^[46]

Fig. 13. TM₀₁ and TM₀₂ mode excited in two different dielectric tubes by an electron beam with rms length 60 µm^[46]

Fig. 14. THz measurement setup^[51]

Fig. 15. Schematic of the EO spatial decoding detection^[53]

Fig. 16. Comparison of the measured spatial-temporal distribution of CTR by EO spatial decoding and scanning EOS^[53]

Fig. 17. The measured electron beam arrival time jitter in EO spatial decoding detection^[53]

Fig. 18. Phase control with two-beam interferometry method in a terahertz dielectric wakefield accelerator^[62]

Fig. 19. Experimental setup of cascaded THz acceleration^[65]

Fig. 20. Experimental results of cascaded terahertz electron acceleration^[65]