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TY - CONF AU - Yang, X. AU - Babzien, M. AU - Bacha, B. AU - Carr, G.L. AU - Cheng, W.X. AU - Doom, L. AU - Fedurin, M.G. AU - Kosciuk, B.N. AU - Li, J.J. AU - Padrazo Jr, D. AU - Shaftan, T.V. AU - Smaluk, V.V. AU - Swinson, C. AU - Yu, L.-H. AU - Zhu, Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Interferometric Measurement of Bunch Length of a 3Mev Picocoulomb Electron Beam J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We report the bunch length measurement of low-energy 3 MeV electron beams in picosecond regime with the charge from 1.0 to 14 pC. It is the first time that we demonstrate single-cycle nano-joule coherent terahertz (THz) radiation from 3MeV electron beam can be meas-ured via a far-infrared Michelson interferometer using a QOD. At this low energy range, when charge is about 1 pC, the signal from the conventional helium-cooled sili-con composite bolometer is too low. Compared to the bunch length measurement via the ultrafast-laser-pump and electron-beam-probe in the timescale 10⁻¹⁴ to 10-12 s which is determined by the phase-transition dynamics in solids, the advantages are: there are no needs of pump laser and probe sample, greatly simplifying the experi-ment; the timing jitter between laser and electron beams contributes no error to the bunch length measurement; furthermore, the method can be extended to sub-picosecond regime enabling bunch length measurement in a much broader timescale 10-14 to 10-11 s for low-energy electron beams. In the current experiment the bunch length is limited to 1 ps only because the setup of driving laser to cathode with a large 70° incident angle, effective-ly lengthening the laser pulse to ≥1 ps. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2766 EP - 2769 KW - laser KW - electron KW - cathode KW - experiment KW - space-charge DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW114 UR - http://jacow.org/ipac2019/papers/wepgw114.pdf ER -