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TH2C3 |
A Novel X-ray Free-electron Laser Scheme Based on Cascaded Laser Wakefield Accelerators | |
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| Laser wakefield accelerators (LWFA) present great potential to drive a free-electron laser (FEL) in a compact footprint because of the extremely high accelerating gradient. However, there are still many obstacles to overcome before the LWFA-driven FEL device can truly achieve exponential amplification and saturated output. These problems include how to resolve the phase slippage effect caused by the fs-level length of LWFA beams, and how to stably generate high-quality beams and preserve the quality during the transport. In this presentation, a novel scheme of X-ray FEL based on cascaded LWFAs is proposed aiming at addressing the above issues. High-quality electron beams with stable central energy and relatively long beam length can be generated using staged LWFAs. With a dedicated beamline design, the longitudinal phase space, beam length and inter-stage coupling are optimized, and start-to-end simulations show that such beams can drive the XFEL to saturation. In addition, the proposed scheme also possesses the capability to adjust FEL radiation bandwidth through precise longitudinal phase space steering. Our scheme provides a highly viable new route to realize LWFA-driven compact XFEL devices. | ||
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TH4A1 |
Progress Towards X-ray Free-electron Laser Driven by Plasma Wakefield Accelerator at SXFEL | |
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| Free-electron lasers (FEL) are unique light source for various applications in structural biology, chemistry and condense physics. Plasma-based accelerators can provide ultrahigh accelerating gradient which is 3~4 orders of magnitude higher than conventional technology, holding the potential for a revolution in particle accelerators. This novel technology therefore has been given high expectations for the development of compact free-electron lasers. SXFEL is a single-pass FEL user facility that provides 2~10 nm radiation for fundamental and applied research. In frame of this report, we present concept and design of a large-bandwidth XFEL based on a plasma wakefield accelerator (PWFA) driven by SXFEL electron beams. An ultrabroad bandwidth is achieved by chirping the electron beam in a hollow-channel plasma and simulations demonstrate that a spectral bandwidth of up to 24% can be obtained in this scheme. We will also present the recent progress on the construction of PWFA-based XFEL experimental station at SXFEL, and the preliminary experimental results on the PWFA and FEL radiation generation. | ||
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