Speaker
Description
Despite tremendous progress in x-ray free-electron laser science over the last decade, future applications still demand fully coherent, stable X rays that have not been demonstrated in existing X-ray FEL facilities. Cavity-based x-ray free electron lasers (CBXFELs) such as the x-ray regenerative amplifier FEL (XRAFEL) and the XFEL oscillator (XFELO) are poised to revolutionize the landscape. In this presentation, I'll introduce some innovative schemes for CBXFELs. First I will talk about the active Q-switched XRAFEL. By using simple electron-beam phase space manipulation, we show this scheme is flexible in controlling the x-ray cavity quality factor Q and hence the output radiation. This section encompasses numerical simulations and planned experiments. In the second part, I will discuss a novel concept staging XRAFEL and XFELO to generate hard X-ray pulses with very narrow bandwidth (~meV) while maintaining high pulse energy (~mJ).
