共查询到20条相似文献,搜索用时 467 毫秒
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介绍了确定不同加速间隙形状和设计结构的强流直线感应加速腔微波特性的方法,即确定频域中加速腔横向阻抗值的方法,包括数值模拟和实验测试。 横向阻抗测试实验中采用了两种测试方法:一种为同轴线束流模拟法,另一种为对加速腔形状因子的测试。实验中测试了3种不同的腔型,并和数值模拟结果进行了比较。两种横向阻抗的测试方法所得结果都与计算结果基本符合,从测试过程的繁简程度和多次实验结果的重复性来看,对于强流直线感应加速腔来说,形状因子值测试方法优于双芯同轴线束流模拟法。实验测试和数值模拟结果显示,确定直线感应加速腔横向阻抗值,测试实验和数值模拟是相辅相成的,缺一不可。 相似文献
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多功能腔集真空泵安装、束流过渡漂移、束流在线测量及方便机器检修等诸多功能于一体,是“神龙一号”加速器束流传输系统的一个关键部件。简要介绍了多功能腔设计中的磁轴准直、输运磁场的连续性以及横向阻抗几个关键问题,阐明了多功能腔的可维修特性和磁轴准直性能,分析了多功能腔对输运磁场连续性的影响,计算了多功能腔的低横向耦合阻抗,并提出了降低横向耦合阻抗的措施。多功能腔的应用简化了束流传输线的结构,提高了束流传输线的性能,将在“神龙一号”直线感应加速器的调试中起到非常重要的作用。 相似文献
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对几种用3维MAFIA仿真软件以及利用其准周期边界条件和后处理模块计算耦合腔行波管慢波结构的色散和耦合阻抗等冷测特性的方法进行了讨论,另外还对两种阻抗_总阻抗和Pierce耦合阻抗的定义进行了充分讨论。考虑到休斯结构耦合腔行波管的电子是与耦合腔慢波结构的负一次谐波发生作用和耦合阻抗应该是电子注截面上的平均值等,指出总阻抗和Pierce耦合阻抗之间相差一个因子,考虑了这个修正因子之后,其结果将更接近实际情况。用这些方法计算耦合腔行波管的冷测特性,得到了与实验冷测值十分接近的结果。 相似文献
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《Infrared Physics & Technology》1999,40(1):1-23
The Helmholtz resonant photoacoustic (PA) cell is a very convenient design of PA system for air pollution monitoring based on infrared molecular absorption. A simple differential Helmholtz resonator designed for flow measurements is presented in this work. The investigation of the PA systems characteristics based on this design includes experimental study of the responsitivity both of the separate photoacoustic cell and the whole photoacoustic system applied to trace gases detection. The experimental observations are compared to the theoretical predictions. A simple arrangement to enhance the photoacoustic signal of the whole system by a factor of 2 is presented. 相似文献
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The paper presents a schematic design of a Tritium Fuel Cycle for Muon-Catalyzed Intense Neutron Source (MC INS) capable of
producing 14 MeV neutrons. Based on the assumption that the fuel mixture should be used in a liquid phase different approaches
are proposed to incorporate a DT cell (synthesizer) into the MC INS facility. Estimations of the total tritium inventory in
the MC INS facility are given. The calculations of the DT cell operation temperature regime using the code FLOW-3D(R) are presented. The capability to remove the thermal energy released in the DT cell of the proposed design is shown. The MC
INS design is analyzed from the viewpoint of tritium safety requirements.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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A photoacoustic (PA) system for monitoring gaseous air pollutants absorbing in the CO-laser range is presented. The characteristics of the CO laser and the interference caused by water-vapor absorption demand a special design of the PA cell and experimental setup. The optimum cell design was found by numerical simulation of the acoustic properties of various cell geometries. For this purpose a model using infinitesimal analogue acoustic impedances was developed. Based on a matrix formalism for fourterminals, a computer program was applied that permits the calculation of the frequency response of the PA signal amplitude at any position within a one-dimensional PA cell. Excellent agreement with experimental data is obtained. As a result, a new design for an acoustically resonant spectrophone with improved properties is presented. The response of the cell with aQ-factor of 52, operated at 555 Hz, is 2000 Pa cm/W. 相似文献
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A 3+1/2cell DC-SC photo-injector for PKU-FEL facility is under development, which is an upgrade design of the successful 1+1/2cell DC-SC photo-injector. The Lorentz detuning and tuning structure for the 3+1/2cell superconducting cavity is presented in this paper. The Lorentz force detuning coefficient is 7.2 Hz/(MV/m)2 with double stiffening rings for the half cell and single stiffening rings between the adjacent TESLA cells. With the special stiffening structure, the 3+1/2cell whole cavity needs only one tuner. The influences of the tuning on frequency shift, field flatness and average gradient are discussed in this paper. The simulation results show that the stiffening rings' design is successful. 相似文献
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TIAN Shun-Qiang 《中国物理C(英文版)》2010,34(7)
A design strategy is discussed in this paper,and it provides much convenience for effectively exploring achievable linear optics and globally investigating the flexibility of a complex lattice with superperiodicity.A matching method of fractional steps,which means separately finding the standard cell setting and the matching cell setting,is adopted to simplify the complexity of the linear beam optics design in the complex lattice.The multi-objective genetic algorithm is used to find most of all the stable linear optics,and reach a target solution after multi-generational propagation,both in the standard cell and the matching cell.A fitting algorithm with gradient information is used to restore the periodicity and symmetry of the lattice,and finely adjust the linear optics for further optimization.This design strategy is applied in the Shanghai Synchrotron Radiation Facility(SSRF)storage ring,and the results are presented. 相似文献
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Christoph Schwanke Lifei Xi Kathrin Maria Lange 《Journal of synchrotron radiation》2016,23(6):1390-1394
A new cell for operando soft X‐ray absorption spectroscopy in transmission mode is presented. Developed for investigations on solar water‐splitting catalysts, the cell allows the study of solid films in direct contact with electrolyte solution while applying voltage and visible light. The design is optimized for fast sample exchange and the simultaneous measurement of fluorescence and transmission signal. The capability of the cell is presented on a manganese oxide (MnOx) film, where electronic structure changes are monitored during forward and backward potential changes. Detailed information about the varying contributions of several Mn oxidation states during this process was revealed. 相似文献
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Kazuki Komatsu Stefan Klotz Satoshi Nakano Shinichi Machida Takanori Hattori Asami Sano-Furukawa 《高压研究》2020,40(1):184-193
ABSTRACTA new high pressure cell for neutron diffraction experiments using nano-polycrystalline anvils is presented. The cell design, off-line pressure generation tests and a gas-loading procedure for this cell are described. The performance is illustrated by powder neutron diffraction patterns of ice VII to ~82?GPa. We also demonstrate the feasibility of single crystal neutron diffraction experiments of Fe3O4 at ambient conditions using this cell and discuss the current limitation and future developments. 相似文献