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@unpublished{tang:fls2023-th4a3, author = {J. Tang and E. Hemsing and Z. Huang and Z. Zhang}, title = {{An Active Q-switched X-ray Regenerative Amplifier Free-electron Lasers}}, % booktitle = {Proc. FLS'23}, booktitle = {Proc. ICFA Adv. Beam Dyn. Workshop (FLS'23)}, eventdate = {2023-08-27/2023-09-01}, language = {english}, intype = {presented at the}, series = {ICFA Advanced Beam Dynamics Workshop}, number = {67}, venue = {Luzern, Switzerland}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {01}, year = {2024}, note = {presented at FLS'23 in Luzern, Switzerland, unpublished}, abstract = {{Despite tremendous progress in X-ray free-electron laser (FEL) science over the last decade, future applications still demand fully coherent,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. In this Letter, we describe an active Q-switched X-ray regenerative amplifier FEL (XRAFEL) to produce fully coherent, high-brightness, hard X-rays. By using simple electron beam phase space manipulation, we show this scheme is very flexible in controlling the X-ray cavity quality factor Q and hence the output radiation. We report both theoretical and numerical studies on this scheme with a wide range of accelerator, X-ray cavity, and undulator parameters}}, }