共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
近年来,我们研制了灵敏面积为300×300毫米~2的二维多丝正比室,它是胰岛素晶体结构分析研究用的一项新技术,可以大大提高对大分子结构分析的数据收集率。该正比室由三个丝极平面组成,阳极丝平面居于两阴极丝平面的中央。阳极丝平面由φ25微米镀金钨丝组成,丝距为3毫米;阴极丝平面由φ63微米的镀金钼丝组成,丝距为2毫米。阳、 相似文献
4.
一种多极平行板雪崩探测器 总被引:2,自引:1,他引:1
描述了一种为RIBLL研制的在线束流监测用双维位置灵敏多极平行板雪崩探测器(Multi-platePPAC)。它主要由中心阳极、两个位置灵敏栅极和两个阴极平面组成。灵敏面积为100mm×100mm。使用异丁烷工作气体,气压稳定在650Pa,阳极在+400V,阴极在-350V时,对三组分α源测得探测器的位置分辨约0.58mm(FWHM),位置非线性±50μm,探测效率好于99.2%。由于该探测器明显的高增益,它适合探测较高能量的较轻粒子。 相似文献
5.
一维位置灵敏电阻阳极低能重离子探测器 总被引:5,自引:4,他引:1
本文讨论了微通道板电阻阳极低能重离子探测器的原理,给出了已研制成功的位敏电阻阳极离子探测器的结构和信号分析电子学线路。用 ̄(238)Puα放射源测量了位敏探测器在有效面积范围内的位置信号、位置线性和位置分辨。位置分辨好于0.3mm,已满足了离子原子碰撞的实验要求。 相似文献
6.
所研究的高气压氙电离室灵敏探测体积结构如图1所示(12根极丝),它采用共面栅极阳极结构,其灵敏探测体积包括不锈钢外壳,阳极丝及陶瓷绝缘固定端。其中,阴极为不锈钢内壳,高101.6mm,底面直径101.6mm,加偏压一4000V,内充相对介电常数为1.12,电导率为0的高纯高压氙气;不锈钢外壳上下两端为厚12.7mm的陶瓷绝缘体,数目为2、4、8、12或16根不锈钢阳极丝等分成收集极和非收集极两组,相互错开排列,收集极加1400V偏压,非收集极保持接地。 相似文献
7.
HLS直线加速器条带束流位置检测器基于对数比方法的标定 总被引:1,自引:0,他引:1
对合肥光源(HLS)直线加速器(LINAC)的束流位置测量系统进行改造,设计并加工了非拦截型、高精度的条带电极束流位置检测器(BeamPositionMonitor,BPM)。安装前,通过定位精度小于5μm的电控位移平台,采用具有更大动态范围和线性度的对数比而非传统的差和比的处理方法,对条带束流位置检测器进行标定。本文介绍了标定平台、对数比处理系统以及自动控制标定程序,给出了基于对数比方法的标定结果。该条带电极束流位置检测器的水平方向和垂直方向的灵敏度分别为1.55dB/mm和1.48dB/mm,束流位置分辨率为42μm,电中心相对于机械中心的偏差为(0.212,0.450)mm。 相似文献
8.
本文主要介绍一维电阻阳极位置灵敏探测器工作的物理机制及它的主要性能和应用,其一维电阻阳极位置分辨率优于200μm能量位置之间的线性相关系数为0.9996138,并成功地用际于电子动量谱仪中。 相似文献
9.
研制了以电荷分配法读出的大型单阳极丝位置灵敏探测器,其灵敏面积为1200×60mm~2。阳极丝采用φ10μm的镍铬合金丝,电阻率为12Ω/mm,两阴极面采用12.5μm的单面蒸铝Mylar膜。工作气体为70%Ar 30%CH_4,在一个大气压下,自然流气式工作。测量前在探测器前窗上贴上1.2m的标尺,将约5MeV的~(241)Amα源,放在一个准直器上,该准直器可以在探测器前窗上面准确、自由地平移。在沿阳极丝方向上,每隔6cm测量一个点,共测量了19个点,测得的平均位置分辨(FWHM)约为0.6mm;最大积分非线性好于0.2%。该探测器已经装配在北京Q3D磁谱仪全焦面探测器系统上准备在串列加速器上进行束流试验。 相似文献
10.
原子能研究所多絲室题目组 《核电子学与探测技术》1982,(6)
本文报道了灵敏面积为300×300mm~2的二维多丝室的结构、工艺以及性能。位置读出是采用扁平延迟线。用~(55)Fe源测得阳极位置线谱半宽度为1.5mm、阴极位置线谱半宽度为2.5mm,并给出了较为清晰的二维成象照片。 相似文献
11.
12.
13.
M. Barbui S. Pesente D. Fabris S. Moretto M. Cinausero V. Rizzi G. Chubarian S. Kowalski J.B. Natowitz L. Qin J. Wang A. Wieloch 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2007,265(2):605-614
The detector system used at the first focus of the BigSol superconducting solenoid beam line at the Texas A & M superconducting cyclotron is presented. The system is composed of a position sensitive PPAC followed by an ionization chamber (IC) with a YAP(Ce) array in its back plane. The position sensitivity of the PPAC as well the energy resolution of the IC is investigated as a function of the counting rate. Pulse height, pulse height resolution and time resolution of the YAP(Ce) crystals are studied for a variety of heavy ion beams ranging from 20Ne to 197Au at energies from 15 AMeV to 40 AMeV. The pulse shape discrimination method using a Flash ADC is also explored, in order to identify decay products (alpha particles and electron/gamma) from the fragments implanted in the scintillator. 相似文献
14.
15.
高位置分辨平行板雪崩室的研制 总被引:1,自引:0,他引:1
卢朝晖 吴和宇 张金霞 张保国 凤莹 谭继廉 胡荣江 李祖玉 魏志勇 段利敏 王宏伟 肖志刚 陈陶 李湘庆 李智焕 柳永英 朱海东 陈克良 王素芳 靳根明 诸永泰 《核电子学与探测技术》2001,21(2):94-96,99
描述了灵敏面积为 10 0 mm× 10 0 mm和 150 mm× 150 mm两维位置灵敏雪崩室。采用分块结构 ,电极从两端分前后点引出 ,增加了延迟线的长度 ,延迟线跨边连接和在大气中直接封真空技术。在流动的 4 2 0 Pa的正庚烷气体中 ,用2 52 Cf裂变源对探测器的性能进行了测试 ,得到Δx=Δy=1mm的位置分辨。 相似文献
16.
数字化波形采样技术在实验核物理中得到了广泛的应用,选取合适的采样频率非常重要。本文使用脉冲幅度甄别定时方法和恒比定时方法对采样频率为100 MHz~5 GHz的平行板雪崩计数器(PPAC)信号进行了模拟分析,采样频率为250~500 MHz时,使用脉冲幅度甄别定时方法可得到比较精确的位置信息,与传统获取系统定位的位置分辨的差别Sigma小于0.15 mm,采样频率低于100 MHz时信号定位误差较大。使用高速采样数字化仪可对信号幅度小于20 mV的信号进行定时分析,与传统的PPAC获取系统相比,探测效率提升了4.3%。 相似文献
17.
Tenzou H. Tanaka H. Ishimoto S. Iwamoto Y. Satoh D. Furuta M. Ishibashi K. Maehata K. Matsumoto Y. Nakamoto T. Numajiri M. 《IEEE transactions on nuclear science》2001,48(5):1672-1678
A cylindrical-type drift chamber consists of an appropriate array of cylindrical single wire proportional counters and has a simple structure. It is shown that a quadratic function reproduced the space-time relationship in the cylindrical-type drift chamber filled with PR gas (Ar:methane=90:10). The difference in the drift times in pair-cells is simply converted into the incident position of charged particles perpendicular to the anode wire using the quadratic function of the space-time relationship. Furthermore, the quadratic function improves the position resolution. A backgammon pattern is employed for the cathode pad of the cylindrical drift chamber. The cylindrical drift cell with a backgammon-shaped cathode pad gives the position resolution along the anode wire. The position resolution in one sigma along the anode wire is obtained to be 1.7 mm on average. The cylindrical-type drift chamber with a backgammon-shaped cathode pad may be applied to a two-dimensional position sensitive detector with a compact structure and simple signal-processing electronics 相似文献
18.
19.
Kim S McClish M Alhassen F Seo Y Shah KS Gould RG 《IEEE transactions on nuclear science》2010,57(5):2518-2523
We demonstrate a position sensitive avalanche photodiode (PSAPD) based compact gamma camera for the application of small animal single photon emission computed tomography (SPECT). The silicon PSAPD with a two-dimensional resistive layer and four readout channels is implemented as a gamma ray detector to record the energy and position of radiation events from a radionuclide source. A 2 mm thick monolithic CsI:Tl scintillator is optically coupled to a PSAPD with a 8mm×8mm active area, providing submillimeter intrinsic spatial resolution, high energy resolution (16% full-width half maximum at 140 keV) and high gain. A mouse heart phantom filled with an aqueous solution of 370 MBq (99m)Tc-pertechnetate (140 keV) was imaged using the PSAPD detector module and a tungsten knife-edge pinhole collimator with a 0.5 mm diameter aperture. The PSAPD detector module was cooled with cold nitrogen gas to suppress dark current shot noise. For each projection image of the mouse heart phantom, a rotated diagonal readout algorithm was used to calculate the position of radiation events and correct for pincushion distortion. The reconstructed image of the mouse heart phantom demonstrated reproducible image quality with submillimeter spatial resolution (0.7 mm), showing the feasibility of using the compact PSAPD-based gamma camera for a small animal SPECT system. 相似文献
20.
In this paper behavior of hard X-ray (HXR) anisotropy and its intensity along the anode bar from APF plasma focus facility
(16 kV, 36 μf, and 115 nH) with different anode tip materials investigated experimentally. Magnetic probe signals registered
to choose only discharges with high degree of current sheath symmetry. The signals obtained by scintillation detectors by
a special arrangement at each angular position show that the employment of higher Z anode insert materials not only increase
the intensity of HXR signal, but also result to high degree isotropic emission of HXR. The side on emitted intensity along
the anode bar has been studied by moving the detector in the direction of central electrode axis. The results confirm the
importance of anode tip material on HXR signal intensity. 相似文献