Time: 2016-05-19 14:00:00
Speaker: Dr. Aihua Deng, Shengfei Tong [IFTS-ZJU]
Place: Rm. 413, Bld. 11#, Yuquan Campus
Abstract: Title: High Brightness Beam from Laser-Triggered Injection in Plasma Wakefield Accelerators (PWFA) as a Driver of 5th Generation Light Source
Speaker: Dr. Aihua Deng @Particle Beam Physics Lab (PBPL), Department of Physics and Astronomy, University of California Los Angeles (UCLA)
Abstract: Recent plasma wakefield accelerator (PWFA) experiments have successfully shown the high-gradient and high efficiency acceleration of either electrons or positrons [1, 2, 3]. A new hybrid scheme of laser-driven under-dense photocathode PWFA to produce electron witness bunches with extreme brightness is reported, which requires precisely spatial alignment and temporal synchronization of the electron and laser pulses in the scale of the wake structure. The latest experiment on the Facility for Advanced Accelerator Experimental Tests (FACET) at SLAC shows the promise of such hybrid acceleration system and their potential as future plasma-based accelerators performance light sources is discussed.
References:
1. Blumenfeld, I. et al. Energy doubling of 42 GeV electrons in a metre-scale plasma wakefield accelerator. Nature 445, 741–744 (2007).
2. Litos, M. et al. High-efficiency acceleration of an electron beam in a plasma wakefield accelerator. Nature 515, 92–95 (2014).
3. Corde S. et al. Multi-giga electron volt acceleration of positrons in a self-loaded plasma wakefield. Nature 524, 442–445 (2015).
Title: Parameter study of double-layer target acceleration
Speaker: Shengfei Tong
Abstract: To generate monoenergetic proton beam from double-layer target configuration, some parameters of the hydrogen layer at the back are limited. Only a little high energy proton is generated from these settings. By modifying some parameters of the target and laser, some methods are found to accelerate more proton with similar energy distribution.