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| 1 | X射线自由电子激光试验装置显示文摘X射线自由电子激光试验装置(以下简称'SXFEL试验装置')是中国第一台X射线相干光源,其输出波长小于9 nm。这台基于0.84 GeV直线加速器、以掌握装置相关技术和实验演示种子型自由电子激光(FEL)级联与短波长回声型FEL为主要目标的自由电子激光装置,于2020年11月通过国家验收。本文将介绍SXFEL试验装置的基本情况和主要进展。 | 赵振堂 王东 殷立新 方国平 顾强 谷鸣 冷用斌 刘波 周巧根 沈立人 张猛 邓海啸 陈家华 陈建辉 陈志豪 丁建国 方文程 冯超 谷端 胡晓 黄大章 黄毛毛 蒋志强 李宾 林国强 刘以勇 孙森 王光宏 王兴涛 王震 吴衍青 俞路阳 袁启兵 张伟 钟少鹏 夏晓彬 唐传祥 黄文会 杜应超 颜立新 | 2021 | 光学学报2021，41，1： | 6 |
| 2 | The nonresonant perturbation theory based field measurement and tuning of a linac accelerating structure显示文摘Assisted by the bead pull technique,nonresonant perturbation theory is applied for measuring and tuning the field of the linac accelerating structure.The method is capable of making non-touching amplitude and phase measurements,real time mismatch feedback and field tuning.Some key considerations of the measurement system and of a C-band traveling-wave structure are discussed,and the bead pull measurement and the tuning of the C-band traveling-wave linac accelerating structure are presented at last. | FANG WenCheng TONG DeChun GU Qiang ZHAO ZhenTang SHENG Xing CHEN LiFang WANG Lin | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，11： | 3 |
| 3 | Effects of mass layer imperfect bonding on the electrical impedance of a quartz crystal microbalance显示文摘We study electrically forced vibrations of a crystal plate of AT-cut quartz carrying a thin mass layer operating as a quartz crystal microbalance for mass sensing.The mass layer is imperfectly bonded to the crystal plate with their interface described by the so-called interface-slip model which allows a discontinuity of the tangential interface displacement.Mindlin’s equations for piezoelectric plates are used.An analytical solution is obtained.The electrical impedance is calculated.The effects of an elastic interface and a viscoelastic interface are examined. | CHEN YangYang WANG Ji DU JianKe YANG JiaShi | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，11： | 2 |
| 4 | Design of a compact C-band high brightness photoinjector for an ultra-fast electron diffraction显示文摘A compact C-band high brightness photoinjector for ultra-fast electron diffraction(UED)is under development at Tsinghua University.The C-band photoinjector,operating at 5.172 GHz,uses a 1.45-cell C-band RF gun as the electron source.The design of the RF gun has addressed the physics,beam dynamics and mechanical aspects,and based on these design studies,a prototype has been fabricated.In order to obtain optimized performance for the UED,beam dynamics simulation has been carried out using the particle tracking code Astra for the photoinjector consisting of an alternative multi-cell RF gun design and a C-band compressor downstream.The beam dynamics parameters that are optimized include the bunch length,peak current,horizontal emittance,and position of the minimum bunch length. | LIU XiaoHan TANG ChuanXiang QIAN HouJun CHEN HuaiBi HUANG WenHui | 2013 | Chinese Science Bulletin2013，58，36： | 1 |
| 5 | Research progress on high intensity hadron accelerator in China显示文摘High intensity hadron beam has wide-range important applications.In recent years,several projects with intense-beam hadron accelerator are under design,development or construction in China.We are facing a lot of challenges in beam physics and key technology of the accelerators.Beam loss and beam emittance must be minimized for such a high intensity accelerator.Space charge effect and nonlinear dynamics should be taken into account in beam physics and accelerator design.In this paper we will present the recent research progress in China on beam dynamics,new technology development and beam experiments for intense beam hadron accelerators,including linear accelerator,synchrotron and cyclotron. | FU ShiNian | 2012 | Chinese Science Bulletin2012，57，36： | 0 |
| 6 | SLED模型的完善和3dB耦合器性能研究显示文摘采用通用的非理想3d B耦合器散射矩阵进行模型完善。利用这一完善的模型对3d B误差进行了分析,研究了3d B耦合器误差对能量倍增器的倍增因子、输出信号峰值和反射信号峰值的影响。为制造和加工3d B耦合器的所允许的误差及其控制提供了理论参考。结果表明:功率分配不平衡误差及其相位关系偏差均可导致能量倍增因子的下降和部分功率发射回速调管。在能量倍增因子的平坦度要求控制在0.02%以内时,3d B耦合器的功率不平衡因子δ<0.035,相位偏差θ<10。 | 李林 顾强 | 2015 | 核电子学与探测技术2015，35，2： | 0 |
| 7 | Radio-frequency design of a new C-band variable power splitter显示文摘A novel variable C-band radio-frequency (RF) power splitter was designed at Shanghai Institute of Applied Physics, Chinese Academy of Sciences. Using three RF impedance combiners, an H-bend, and an RF polarizer, this new power splitter is much more compact than a traditionally designed splitter, which comprises three 3-dB hybrids. The parameters were optimized to achieve good matching and minimize reflection. Here, the RF design of the new C-band variable power splitter is presented. | Zong-Bin Li Alexej Grudiev Wen-Cheng Fang Qiang Gu Zhen-Tang Zhao | 2019 | Nuclear Science and Techniques2019，30，6： | 0 |
| 8 | Design,fabrication,and cold-test results of C-band spherical RF pulse compressor prototype显示文摘Purpose Pulse compressor is a useful and common RF structure for Free Electron Laser and Linear Collider Facilities, whichcan improve the input power of accelerating structures significantly.Methods In this study, we designed, fabricated and tested a prototype of a compact C-band spherical pulse compressor.This pulse compressor utilizes one high Q0 spherical RF resonant cavity that works with two degenerated TE1,1,3modes anda dual-mode polarized coupler. The cavity and coupler were designed and machined separately and then brazed together.The prototype was tested carefully using vector network analyzer, and a cold-test system was set up to check the workingconditions of the spherical pulse compressor with inversed input powerResults Associated with the C-band high-gradient accelerating structures, the peak power gain and energy multiply factorcan be as high as 6.1 and 1.85, respectively, in theory. The average power gain is 3.8 in the first 0.372 μs after the phasereverse, which is the accelerator filling time. During the cold test, a peak power multiply factor of 6.04 and an energy multiplyfactor of 1.83 were achieved.Conclusions The test results agreed with the design well. The prototype was successfully made as a pre-research for thefuture energy multiplying scheme of SXFEL. | Zong‑Bin Li Wen‑Cheng Fang Qiang Gu Jian‑Hao Tan Xiao‑Xia Huang Zhen‑Tang Zhao | 2019 | Radiation Detection Technology and Methods2019，3，3： | 0 |
| 9 | Analytic RF design of a linear accelerator with a SLED-Ⅰ type RF pulse compressor显示文摘This study presents the RF design of a linear accelerator(linac)operated in single-bunch mode.The accelerator is powered by a compressed RF pulse produced from a SLED-I type RF pulse compressor.The compressed RF pulse has an unflattened shape with a gradient distribution which varies over the structure cells.An analytical study to optimize the accelerating structure together with the RF pulse compressor is performed.The optimization aims to maximize the efficiency by minimizing the required RF power from the generator for a given average accelerating gradient.The study shows that,owing to the compressed RF pulse shape,the constant-impedance structure has a similar efficiency to the optimal structure using varying iris apertures.The constant-impedance structure is easily fabricated and is favorable for the design of a linac with a pulse compressor.We utilize these findings to optimize the RF design of a X-band linac using the constant-impedance accelerating structure for the Tsinghua Thomson X-ray source facility. | Jia-Yang Liu Jia-Ru Shi Hao Zha Alexej Grudiev Ping Wang Ying-Chao Du Huai-Bi Chen | 2020 | Nuclear Science and Techniques2020，31，11： | 0 |
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