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AISL:一个基于LAMMPS的xfel辐照损伤自动化模拟程序

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核技术 2024年第4期47卷 97-106页

作者：周悦海雪任翠兰殷亚茹商琨琳雷蕾怀平上海科技大学上海201210 中国科学院上海应用物理研究所上海201800 中国科学院大学北京100049 中国科学院上海高等研究院上海201210

在高强度X射线辐照下,X射线自由电子激光(X-ray Free-electron Laser,xfel)装置的光学元件薄膜产生的大量辐照缺陷会导致材料结构损伤,引起宏观性能退化,从而影响其服役寿命,进而影响到xfel装置的可靠性和稳定性。为了研究材料辐照缺陷... 详细信息

在高强度X射线辐照下,X射线自由电子激光(X-ray Free-electron Laser,xfel)装置的光学元件薄膜产生的大量辐照缺陷会导致材料结构损伤,引起宏观性能退化,从而影响其服役寿命,进而影响到xfel装置的可靠性和稳定性。为了研究材料辐照缺陷过程以及方便耐辐照材料的数据积累,提供了一种基于Python语言的自动化辐照模拟程序AISL(Automatic Irradiation Simulation based on LAMMPS),以支持采用分子动力学方法模拟xfel对材料的辐照损伤进行微观研究。AISL实现了模拟任务的自动化工作流管道,包括高通量计算任务的管理和执行,计算数据的高可靠存储和热力学信息的后处理。基于AISL在xfel光学元件金属薄膜辐照损伤模拟的应用实例研究,表明了AISL是一种便捷开展高通量自动化的辐照模拟研究的有效方法,能够显著提高基于LAMMPS的材料辐照损伤模拟计算效率。

关键词： xfel 辐照损伤 LAMMPS 工作流数据库

An accelerator scenario for a hard X-ray free electron laser combined with high energy electron radiography

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Chinese Physics C 2016年第8期40卷 166-173页

作者：魏涛李一丁杨国君庞健李煜辉李鹏 Joachim Pflueger 何小中卢亚鑫王科龙继东章林文吴强 Institute of Fluid Physics China Academy of Engineering Physics P.O. Box 919-106 Mianyang 621900 China European xfel Gmbh Hamburg 22607 Germany Institute of Applied Electronics China Academy of Engineering Physics Mianyang 621900 China

In order to study the dynamic response of the material and the physical mechanism of fluid dynamics, an accelerator scenario which can be applied to both hard X-ray free electron laser and high energy electron radiography is proposed. This accelerator is mainly composed of a 12 GeV linac, an undulator branch and an eRad beamline. In order to characterize a sample＇s dynamic behavior in situ and real-time with xfel and eRad simultaneously, the linac should be capable of accelerating the two kinds of beam within the same operation mode. Combining in-vacuum and tapering techniques, the undulator branch can produce more than 10zl photons per pulse in 0.1% bandwidth at 42 keV. Finally, an eRad amplifying beamline with 1：10 ratio is proposed as an important complementary tool for the wider view field and density identification ability.

关键词： xfel eRad linac undulator emittance

Design study on the merger for BXERL-FEL

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Chinese Physics C 2009年第8期33卷 696-700页

作者：朱雄伟王书鸿陈森玉 Institute of High Energy Physics Chinese Academy of Sciences

In North China, there is a preliminary proposal for ERL-FEL light source （BXERL-FEL） with its aim at ＂one machine, two purposes＂（the xfel and ERL work simultaneously）. One of the key technologies is the merger section. In this paper, we give the physical design of the merger section for BXERL-FEL which merges three kinds of electron beam.

关键词： ERL xfel merger

Solution of the effects of twinning in femtosecond X-ray protein nanocrystallography

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Chinese Physics C 2013年第2期37卷 105-110页

作者：周亮刘鹏董宇辉 Institute of High Energy Physics Chinese Academy of Sciences

With the development of the xfel （X-ray free electron laser）, high quality diffraction patterns from nanocrystals have been achieved. The nanocrystals with different sizes and random orientations are injected to the xfel beams and the diffraction patterns can be obtained by the so-called ＂diffraction-and-destruction＂ mode. The recovery of orientations is one of the most critical steps in reconstructing the 3D structure of nanocrystals. There is already an approach to solve the orientation problem by using the automated indexing software in crystallography. However, this method cannot distinguish the twin orientations in the cases of the symmetries of Bravais lattices higher than the point groups. Here we propose a new method to solve this problem. The shape transforms of nanocrystals can be determined from all of the intensities around the diffraction spots, and then Fourier transformation of a single crystal cell is obtained. The actual orientations of the patterns can be solved by comparing the values of the Fourier transformations of the crystal cell on the intersections of all patterns. This so-called ＂multiple-common-line＂ method can distinguish the twin orientations in the xfel diffraction patterns successfully.

关键词： coherent X-ray diffractive imaging xfel oversampling technique protein nanocrystallography,multiple-common-lines

Design study of a L-band photocathode RF injector

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Chinese Physics C 2010年第2期34卷 210-213页

作者：朱雄伟王书鸿陈森玉 Institute of High Energy Physics Chinese Academy of Sciences

In the proposal of the Beijing Advanced Light Source, a compact combination of XERL and xfel using a common SC linac is being considered. In the meantime, an ERL-FEL test facility is being proposed and will be used for THz radiation. In this test facility, a L-band photocathode RF injector is needed. In this paper, we give the physical design of the L-band photocathode RF injector for the test facility.

关键词： xfel RF gun photocathode

Damage resistance of B4C reflective mirror irradiated by X-ray free-electron laser

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Chinese Optics Letters 2023年第2期21卷 105-110页

作者：曹锦玉李淑慧佟亚军汤鸣李文斌黄秋实江怀东王占山 MOE Key Laboratory of Advanced Micro-Structured Materials Institute of Precision Optical Engineering School of Physics Science and EngineeringTongji University Center for Transformative Science ShanghaiTech University

In this paper,a simple theoretical model combining Monte Carlo simulation with the enthalpy method is provided to simulate the damage resistance of B4C/Si-sub mirror under X-ray free-electron laser *** different damage mechanisms are found,dependent on the photon *** optimum B4C film thickness is determined by studying the dependence of the damage resistance on the film *** on the optimized film thickness,the damage thresholds are simulated at photon energy of 0.4-25 keV and a grazing incidence angle of 2 *** is recommended that the energy range around the Si K-edge should be avoided for safety reasons.

关键词： B4C film xfel damage mechanism damage threshold enthalpy method

Development of new diagnostics based on LiF detector for pump-probe experiments

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Matter and Radiation at Extremes 2018年第4期3卷 197-206页

作者： T.Pikuz A.Faenov NOzaki T.Matsuoka B.Albertazzi N.J.Hartley K.Miyanishi K.Katagiri S.Matsuyama K.Yamauchi H.Habara Y.Inubushi T.Togashi H.Yumoto H.Ohashi Y.Tange T.Yabuuchi M.Yabashi A.N.Grum-Grzhimailo A.Casner I.Skobelev S.Makarov S.Pikuz G.Rigon M.Koenig K.A.Tanaka T.Ishikawa R.Kodama Graduate School of Engineering Osaka UniversitySuitaOsaka 565-0871Japan Joint Institute for High Temperatures Russian Academy of SciencesMoscow 125412Russia Open and Transdisciplinary Research Initiatives Osaka UniversitySuitaOsaka 565-0871Japan Photon Pioneers Center Osaka UniversitySuitaOsaka 565-0871Japan LULI e CNRS Ecole PolytechniqueCEA:Universite Paris-SaclayUPMC Univ Paris 06:Sorbonne Universites-F-91128 Palaiseau cedexFrance Helmholtz-Zentrum Dresden-Rossendorf Dresden 01328Germany Japan Synchrotron Radiation Research Institute Sayo-choSayo-gunHyogo 679-5198Japan RIKEN Spring-8 Center Sayo-choSayo-gunHyogo 679-5148Japan Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State UniversityMoscow 119991Russia Universite de Bordeaux-CNRS-CEA CELIA(Center Lasers Intenses et Applications)UMR 5107F-33405 TalenceFrance National Research Nuclear University MEPhI Moscow 115409Russia ELI-NP/IFN-HH Maqurele-Bucharest 077125 Romania ILE Osaka UniversitySuitaOsaka 565-0871Japan

We present new diagnostics for use in optical laser pump-X-ray Free Electron Laser(xfel)probe experiments to monitor dimensions,intensity profile and focusability of the xfel beam and to control initial quality and homogeneity of targets to be driven by optical laser *** developing X-ray imaging,based on the use of an LiF crystal detector,we were able to measure the distribution of energy inside a hard X-ray beam with unprecedented high spatial resolution(~1 mm)and across a field of view larger than some *** diagnostic can be used in situ,provides a very high dynamic range,has an extremely limited cost,and is relatively easy to be implemented in pump-probe *** proposed methods were successfully applied in pump-probe experiments at the SPring-8 Angstrom Compact free electron LAser(SACLA)xfel facility and its potential was demonstrated for current and future High Energy Density Science experiments.

关键词： xfel Shock waves Pump-probe experiments High energy density science X-ray spectroscopy X-ray imaging

Tolerance Study for CTF Bunch Compressor

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Chinese Physics C 2008年第Z1期32卷 218-219页

作者：朱雄伟中国科学院高能物理研究所北京100049

Bunch compressor is widely used in free electron laser *** normalized emittance dilution comes from the high order magnet components and the misalignment of *** paper describes the tolerance study for the CTF first bu... 详细信息

关键词： xfel bunch compressor tolerance

A Multi-MW Proton/Electron Facility at KEK

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Journal of Applied Mathematics and Physics 2017年第6期5卷 1222-1242页

作者： R. Belusevic IPNS High Energy Accelerator Research Organization (KEK) Ibaraki Japan

The main “bottleneck” limiting the beam power in circular machines is caused by space charge effects that produce beam instabilities. To increase maximally the beam power of a “proton driver”, it is proposed to build a facility consisting solely of a 2.5 GeV injector linac (PI) and a 20 GeV pulsed superconducting linac (SCL). Such a facility could be constructed using the existing KEK accelerator infrastructure. The PI, based on the European Spallation Source (ESS) linac, would serve both as an injector to the SCL and a source of proton beams that could be used to copiously produce, e.g., muons and “cold” neutrons. Protons accelerated by the SCL would be transferred through the KEK Tristan ring in order to create neutrino, kaon and muon beams for fixed-target experiments. At a later stage, a 70 GeV proton synchrotron could be installed inside the Tristan ring. The SCL, comprising 1.3 GHz ILC-type rf cavities, could also accelerate polarized or unpolarized electron beams. After acceleration, electrons could be used to produce polarized positrons, or may traverse an xfel undulator.

关键词： Proton Driver Superconducting Linac Neutrino Oscillations Rare Kaon Decays xfel