Speaker
Description
Generation and control of two electron bunches to achieve desired drive and witness quality is crucial for plasma-wakefield acceleration (PWFA) experiments. One scheme to generate two electron beams with desired spacing is to apply two laser pulses with ps delay on the photocathode and co-accelerated two electron beams in the same RF bucket. Such a method is used in e.g. two-color FEL[1,2,3] and PWFA experiments [4].This is also currently the standard running mode for PWFA experiment at FACET-II national user facility [5].
We will talk about the dynamic, operation, and control aspects of the photocathode two-bunches configuration with nC bunch charge, asymmetric bunch charge ratio, kA peak current, and multi-stage compression. We will talk about experimental performance, and benchmark it against simulation and analytic theory incorporating wakefield effect. We demonstrate excellent longitudinal simulation-experiment agreement using XTCAV measurements, and show that photocathode two bunches provide sufficient flexibility and tunability for various advanced accelerator applications.
[1] Marinelli, A., Ratner, D., Lutman, A. et al. High-intensity double-pulse X-ray free-electron laser. Nat Commun 6, 6369 (2015). https://doi.org/10.1038/ncomms7369
[2] Zhang, Z., Ding, Y., Marinelli, A. & Huang, Z. Longitudinal dynamics of twin electron bunches in the Linac Coherent Light Source. Phys. Rev. ST Accel. Beams 18, 030702 (2015). https://doi.org/10.1103/PhysRevSTAB.18.030702
[3] Chiadroni, E., Anania, M.P., Artioli, M. et al. Two Color FEL Driven by a Comb-like Electron Beam Distribution. Phys. Procedia 52, 27–35 (2014). https://doi.org/10.1016/j.phpro.2014.06.005
[4] Pompili, R., Anania, M.P., Bellaveglia, M. et al. Beam manipulation with velocity bunching for PWFA applications. Nucl. Instrum. Methods Phys. Res. A 829, 17–23 (2016). https://doi.org/10.1016/j.nima.2016.01.061
[5] Yakimenko, V., Alsberg, L., Bong, E. et al. FACET-II facility for advanced accelerator experimental tests. Phys. Rev. Accel. Beams 22, 101301 (2019). https://doi.org/10.1103/PhysRevAccelBeams.22.101301
| Working group | WG5 |
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