Thermal loading on crystals in an x-ray free-electron laser oscillator

doi:10.1103/PhysRevAccelBeams.23.090704

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Thermal loading on crystals in an x-ray free-electron laser oscillator
	Huang, NS ; Deng, HX
刊名	PHYSICAL REVIEW ACCELERATORS AND BEAMS
	2020
卷号	23 期号:9 页码:-
关键词	BRAGG REFLECTIVITY DIAMOND MONOCHROMATOR SCATTERING OPERATION HEAT
ISSN号	2469-9888
DOI	10.1103/PhysRevAccelBeams.23.090704
文献子类	期刊论文
英文摘要	X-ray free electron laser oscillators (XFELOs) arc future light sources that produce fully coherent hard x-ray pulses. Based on the low-gain principle, the XFELO traps x-ray pulses in an optical cavity composed of multiple Bragg-reflecting mirrors that have high reflectivity in a bandwidth of about ten meV. The crystal mirrors exposed to intense x-ray beams in the optical cavity are subject to thermal deformations that would shift and distort the Bragg reflectivity curve. Therefore, the stability of the XFELO operation depends on the ability of the mirrors to maintain the Bragg reflection under such thermal load. A new approach was used to analyze the thermal load of the mirrors. The approach utilizes a dedicated Bragg reflection physical process in GEANT4 to obtain precise absorption information of the XFELO pulses in the crystal. Following transient thermal behavior, including single pulse and multiple pulse inputs, was analyzed by finite element analysis software based on the energy absorption information extracted from the GEANT4 simulation. It is shown that, for a typical XFELO pulse depositing about ten microjoules energy the over a spot of tens of micrometers in radius, the thermal relaxation time across the thickness is on tens of nanoseconds scale. In this situation, a simplified heat-load model is then developed to integrate the heat load in the XFELO. With the simplified model, the potential impact of the thermal load on the XFELO operation is estimated. When a large amount of heat remains in the crystal, the pulse energy drops significantly and has large oscillations due to negative feedback of the temperature change on the pulse energy.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/33206]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China 2.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Huang, NS,Deng, HX. Thermal loading on crystals in an x-ray free-electron laser oscillator[J]. PHYSICAL REVIEW ACCELERATORS AND BEAMS,2020,23(9):-.
APA	Huang, NS,&Deng, HX.(2020).Thermal loading on crystals in an x-ray free-electron laser oscillator.PHYSICAL REVIEW ACCELERATORS AND BEAMS,23(9),-.
MLA	Huang, NS,et al."Thermal loading on crystals in an x-ray free-electron laser oscillator".PHYSICAL REVIEW ACCELERATORS AND BEAMS 23.9(2020):-.