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TY - CONF AU - Wang, D. AU - Du, Y. C. AU - Huang, W.-H. AU - Liu, X. AU - Su, X.L. AU - Tang, C.-X. AU - Tian, Q.L. AU - Yan, L.X. AU - Zhang, H. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Investigation of Two-Bunch Train Compression by Velocity Bunching J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - Two electron beamlets, also referred as two-bunch train with adjustable time and energy spacing are popular in many applications such as two color FEL and pump-probe experiments. We investigate compression of two-bunch train via velocity bunching scheme in a traveling wave accelerator (TWA) tube by varying the phase of TWA tube in a very large range. Beam dynamics simulations show that when the phase injected into the accelerator tube for the beam is set to ≪-100 degree, velocity bunching occurs in a deep over-compression mode, where two-bunch train is continuously tunable in time and in energy space, and the emittance of each sub-bunch is also preserved. In the experiment, we use energy spectrum and defecting cavity to diagnose the train's energy space and time space respectively, the measurements demonstrated that two-bunch train through deep over-compression scheme is separated both in time and in energy space, which also agree well with the predictions. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3548 EP - 3550 KW - bunching KW - electron KW - cavity KW - emittance KW - experiment DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPAK131 UR - http://jacow.org/ipac2018/papers/thpak131.pdf ER -