共查询到20条相似文献,搜索用时 15 毫秒
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Er-Lei Chen Chang-Qing Feng Shu-Bin Liu Chun-Feng Ye Dong-Dong Jin Jian Lian Hui-Jun Hu 《核技术(英文版)》2017,28(1)
The readout electronics for a prototype soft X-ray spectrometer based on silicon drift detector (SDD),for precisely measuring the energy and arrival time of X-ray photons is presented in this paper.The system mainly consists of two parts,i.e.,an analog electronics section (including a pre-amplifier,a signal shaper and filter,a constant fraction timing circuit,and a peak hold circuit) and a digital electronics section (including an ADC and a TDC).Test results with X-ray sources show that an energy dynamic range of 1-10 keV with an integral nonlinearity of less than 0.1% can be achieved,and the energy resolution is better than 160 eV@5.9 keV FWHM.Using a waveform generator,test results also indicate that time resolution of the electronics system is about 3.7 ns,which is much less than the transit time spread of SDD (<100 ns) and satisfies the requirements of future applications. 相似文献
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在LabVIEW5.1平台上开发了软X射线磁性圆二色(SXMCD)实验站的数据采集和控制程序。友好、清晰的人机界面使得用户可以很快使用该程序。用户的界面分为3个部分:仪器参数设置、初始值输入和实验数据曲线的实时显示。最后实验数据可以存为标准的ASCII字符文件,从而可为其它专业处理软件所调用。 相似文献
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在ICF软X光能谱仪诊断实验中,为了将能谱仪各通道输出的纳秒尺度测量信号在时间上精确关联,需要测试系统提供定时精度好于200ps多路一致的时标信号.为此研制了无源纯电阻8路功分器来提供时标信号,通过对其性能进行的测试,表明该功分器基本满足现有物理实验要求.同时对功分器的进一步改进进行了分析,提出了解决方案. 相似文献
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《等离子体科学和技术》2020,22(8):84002
Spectral measurement of tungsten (W) impurity is essential to study impurity transport.
Therefore, an X-ray crystal spectrometer (XCS) on EAST was used to measure the line spectra
from highly ionized W ions. On EAST, both poloidal XCS and tangential XCS have been
developed to measure the plasma temperature as well as the rotation velocity. Recently, He-like
and H-like argon spectra have also been obtained using a two-crystal setup. W lines are identified
in this study. Through a careful analysis, the W lines of 3.9336, 3.9321, and 3.664 Å are found to
be diffracted by He-like or H-like crystals. The lines are confirmed with the NIST database. We
also calculated the ion temperature with Doppler broadening of these lines. The ion temperature
from the W lines is entirely consistent with that from Ar line spectra. The measurement of these
W line spectra could be used to study W impurity transport in future work. 相似文献
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1 Introduction Over the recent several decades, artificial layered structures have been extensively developed as useful functional structures for semiconductor devices [1], magnetic devices [2], X-ray high-reflectance mirrors [3], and so on. They are initially designed as multilayers consisting of uniform layers with the same properties as those of bulk materials and having clear-cut inter- faces (boundaries). However, in real cases, some lay- ers have structures different from those of bulk m… 相似文献
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S. Pszona K. Wincel W. Bulski M. Traczyk 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(1):92-96
A new simplified model of a free air ionization chamber called a windowless air ionization chamber (WIC), for kerma in air measurements from the soft X-ray sources, has been designed and tested. The design is based on Monte Carlo calculations. The assembled WIC for testing has the electrodes in the form of half cylinders (internal diameter 36 mm; internal length 85 mm). The volume of the collecting sector of this chamber is around 1 cm3. An entrance aperture has 6 mm diameter. The results of MC calculations and tests for X-ray qualities: ranging 0.3-0.7 mm Al HVL are given. 相似文献
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在北京同步辐射装置(BSRF)设计建造了-套基于多层膜偏振元件的软X射线偏振测量分析装置,可工作在双反、双透、前反后透和前透后反四种工作模式,既可作为偏振测量装置,用于同步辐射光束线和多层膜偏振元件偏振特性测量,也可作为通用反射率计,用于多层膜和薄膜的反射或透射率测量,又可用于磁性材料的磁光效应研究等.利用自行研制的装置和光学元件对BSRF的3W1B光束线的偏振特性进行了系统的测量.测量结果指出,在206 eV时,输出光的线偏振度从起偏前的O.585上升到起偏后的0.995,同步光的线偏振度得到极大改善.利用非周期宽带Mo/Si多层膜开展了铁磁性材料的磁光法拉第效应测量,获得了Ni薄膜3p边附近(60-70 eV)的法拉第旋转角度,最大偏转角度在65.5 eV和68 eV分别为1.85±0.19°和-0.75±0.09°. 相似文献
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国际热核聚变实验反应堆是世界上在建的最大的磁约束聚变装置托克马克装置,通过对其中软X射线的测量,可实现等离子体辐射对锯齿、色骨模等磁流体现象的物理研究和成像反演。软X射线诊断系统就是用来检测软X射线的设备。由于热核聚变时恶劣电磁环境及远距离传输,在设计信号检测系统时必须进行电磁兼容设计,以降低系统噪声、提高检测精度。本文中使用的检测电路采用差分结构实现电流信号到电压信号的转换,重点研究检测电路的实现及其电磁兼容设计。从电磁抗干扰的三要素出发,结合实验测试,针对电磁干扰的特殊性,讨论了滤波电路设计、印制电路板(Printed Circuit Board,PCB)走线、电磁屏蔽及信号接地在系统中实现。本文采用32通道板卡集成设计;信号增益提高至107 V?A-1;放大器带宽达到120 k Hz。通过测试结果可以看出,信号噪声降至8 mV。通过优化设计提高了检测电路的集成度和放大电路的增益及带宽,同时降低了检测电路的噪声。 相似文献
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M.WATANABE M.YANAGIHARA T.EJIMA M.TOYODA Y.KONDO T.HATANO T.TSURU M.YAMAMOTO 《核技术(英文版)》2005,16(3):129-138
Microscopes in vacuum ultraviolet and soft X-ray regions using a normal incidence type of Schwarzschild objective are reviewed. The objective consists of a concave mirror and a convex mirror coated with a high reflectance multilayer, having a large numerical aperture comparing with other objectives. The microscopes have been used to diagnose inertia-confinement-fusion plasmas, and to investigate small samples or microstructures of inorganic and organic materials by imaging them using laboratory light sources. Synchrotron radiation has been also used to obtain a microbeam for a photoelectron scanning microscope with a spatial resolution of 0.1 μm. The structure and performance of two laboratory microscopes developed at Tohoku University are demonstrated. One of them is a soft X-ray emission imaging microscope, An image of an artificial pattern made of W and SiO2 on Si wafer by focusing Si L emission was presented, The other is an ultraviolet photoelectron scanning microscope using a He (helium) gas discharge lamp. The valence band spectra of a microcrystal of FeWO4 were presented, Furthermore other applications such as demagnifying optics for lithography and optics to gather fluorescence for emission spectroscopy are introduced. 相似文献