共查询到19条相似文献,搜索用时 218 毫秒
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低温永磁波荡器(Cryogenic Permanent Magnet Undulator,CPMU)利用稀土永磁材料钕铁硼或镨铁硼在低温下的剩磁及内禀矫顽力大幅增大的特性,通过使磁体工作在50-150 K的低温环境,获得相比于常规真空内波荡器(In-vacuum Undulator,IVU)高30%-50%的磁场性能。在磁气隙一定的条件下,CPMU可以在较小的周期长度下获得较大的磁场强度,这对于提升同步辐射光的亮度具有重要意义。本文介绍了上海光源(Shanghai Synchrotron Radiation Facility,SSRF)钕铁硼CPMU磁体冷却技术的研究进展,对CPMU的静态热负载进行了详细的理论分析及实验研究。CPMU静态热负载的理论分析方法在CPMU样件低温冷却实验装置得到了验证,并在完整钕铁硼CPMU样机中得到了应用。 相似文献
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按北京正负电子对撞机重大改造工程(BEPCⅡ)计划,为压缩束团尺寸、提高探测器的分辨率以及粒子识别能力,在南对撞区分别安装1对强聚焦超导插入四极磁体(SCQ)和1台超导螺线管探测器磁体(SSM)。本文针对1对超导插入四极磁体的冷却,采用数值模拟的方法给出了SCQ磁体分别采用超临界氦流和过冷氦流两种冷却方式下冷却流程的热力参数,通过对模拟结果的分析,给出了适合该超导插入四极磁体的冷却方式和正常运行的热力参数。还给出了该低温系统关键设备之一的过冷器的设计方法以及设计参数。 相似文献
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《核技术》2015,(3)
跟据用户的实验要求,本项目为上海光源中产生低轴功率密度的同步辐射光设计了新型波荡器EPU200(Elliptically Polarized Undulator)。EPU200是首台拥有8排磁化块、可以产生椭圆极化辐射并降低轴功率密度的纯永磁波荡器。其8排磁排列安装在4根铝梁上,每个磁化块固定件上安装两块磁化块,其磁结构的机械结构和安装十分复杂。磁结构对波荡器的品质有很大影响,首先设计EPU200的磁结构的机械结构,根据磁化块的排列通过Radia程序计算出磁化块的最大受力,并通过ANSYS Workbench对磁结构进行力学分析,得出该结构中磁化块的位置变形量,从而验证该机械结构的可行性。 相似文献
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介绍了上海光源光束线液氮冷却单色器中应用的压电陶瓷的控制,阐述了应用EPICS实现的软硬件系统结构.测试结果表明该系统线性度、稳定度完全满足单色器控制的要求. 相似文献
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自由电子激光(Free Electron Laser,FEL)是一种以相对论高品质电子束作为工作介质,在周期磁场中以受激发射方式放大电磁辐射的新型激光源。束流稳定性的好坏是影响FEL性能的关键指标。波荡器段关键元件运行过程中的位置稳定性是影响束流位置稳定性的关键因素之一,其中上海软X射线自由电子激光(Soft X-ray FEL,SXFEL)和大连极紫外相干光源(Dalian Coherent Light Source,DCLS)科学研究装置中波荡器段间四极铁的位置稳定性要求较高。波荡器段间四极铁支撑平台为四极铁等关键元件提供支撑、定位及位置调节,从而间接地要求其具有高的稳定性。本文通过对一种平台的支撑方式进行模态和地基随机振动响应的有限元分析和测试,得到平台的结构动态特性,并进行稳定性分析,为段间平台的工程设计提供理论依据。 相似文献
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《Fusion Engineering and Design》2014,89(9-10):2241-2245
The remountable (mountable and demountable repeatedly) high-temperature superconducting (HTS) magnet has been proposed for huge and complex superconducting magnets in future fusion reactors to fabricate and repair easily the magnet and access inner structural components. This paper summarizes progress in R&D activities of mechanical joints of HTS conductors in terms of the electrical resistance and heat transfer performance at the joint region. The latest experimental results show the low joint resistance, 4 nΩ under 70 kA current condition using REBCO HTS conductor with mechanical lap joint system, and for the cooling system the maximum heat flux of 0.4 MW/m2 is removed by using bronze sintered porous media with sub-cooled liquid nitrogen. These values indicate that there is large possibility to design the remountable HTS magnet for fusion reactors. 相似文献
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This paper describes design and fabrication of a hybrid high temperature superconducting (HTS) magnet for a 150 kJ superconducting magnetic energy system. The hybrid HTS magnet, which employs both BSCCO taps and YBCO taps, is composed of 18 double pancake coils (DPC). Six DPC made of BSCCO are respectively installed on the top and bottom with an inner diameter of 240 mm, an outer diameter of 396 mm, and height of 11.5 mm. Six YBCO coils are mounted in the middle of the magnet with the inner and outer diameters of 264, 396 mm and height of 12.1 mm. Copper plates with thickness of 1 mm are arranged between DPC for the cooling of the heat, and epoxy resin plates with thickness of 0.2 mm are arranged between coil and copper plate for the insulation. The inductance of the magnet is about 11.06 H and the resistance is 169.5 Ω at the room temperature. In order to evaluation the performance of the hybrid magnet, each solidified DPC and the assembled magnet were tested in a bath of liquid nitrogen at 77 K. The resistances of 17 joints were also measured and evaluated by the standard four-probe method. 相似文献
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超导四极(SCQ)磁体是北京正负电子对撞机重大改造工程(BEPCⅡ)的关键设备之一。本文对SCQ磁体恒温器进行稳定运行状态下传热和流动计算。计算得到了磁体在低温下的热负荷以及磁体恒温器内各组成部分的温度分布,并在此基础上,提出减小SCQ磁体热负荷的方法。比较计算了SCQ磁体采用超临界和过冷液氦两种冷却方式对磁体稳定运行的影响。 相似文献
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Manman XU Yuntao SONG Gen CHEN Yanping ZHAO Yuzhou MAO Guang LIU Zhen PENG 《等离子体科学和技术》2017,19(11):115601
Ion cyclotron range of frequency(ICRF) heating has been used in tokamaks as one of the most successful auxiliary heating tools and has been adopted in the EAST. However, the antenna load will fluctuate with the change of plasma parameters in the ICRF heating process. To ensure the steady operation of the ICRF heating system in the EAST, fast ferrite tuner(FFT) has been carried out to achieve real-time impedance matching. For the requirements of the FFT impedance matching system, the magnet system of the ferrite tuner(FT) was designed by numerical simulations and experimental analysis, where the biasing magnetic circuit and alternating magnetic circuit were the key researched parts of the ferrite magnet. The integral design goal of the FT magnetic circuit is that DC bias magnetic field is 2000 Gs and alternating magnetic field is±400 Gs. In the FTT, E-type magnetic circuit was adopted. Ferrite material is Nd Fe B with a thickness of 30 mm by setting the working point of Nd Fe B, and the ampere turn of excitation coil is 25 through the theoretical calculation and simulation analysis. The coil inductance to generate alternating magnetic field is about 7 m H. Eddy-current effect has been analyzed, while the magnetic field distribution has been measured by a Hall probe in the medium plane of the biasing magnet. Finally, the test results show the good performance of the biasing magnet satisfying the design and operating requirements of the FFT. 相似文献
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Linge ZANG 《等离子体科学和技术》2022,24(6):64002
An E//B neutral particle analyzer is under development for fast ion diagnosis on HL-2A/2 M tokamak. The stripping unit is composed of a stripping room (equipped with two differential tubes and a gas supply bellows), a vacuum chamber and a vacuum pumping system. The stripping efficiency of the stripping room is calculated in the form of global efficiency R × f+1, where R is the non-scattered-away rate and f+1 is the fraction of charge state +1. The magnetic field of the E//B analyzer is produced with a permanent magnet. The yoke and the poles of the magnet are made of mild steel and the magnet plates are made of NdFeB. The magnetic poles are specially designed to focus the ion trajectories and to increase the use rate of the magnet. The shape of the magnet and the electric plates are carefully designed so that the ions are dispersed into two lines of H+ and D+ on the detector plane. For each line, the energy increases from 10 to 200 keV from one side to another. 相似文献
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