多气隙电阻板室蒙特卡洛模拟与实验的比较

介绍了一个在电阻板室雪崩增长与信号发展的模型,模拟了多气隙电阻板室的电荷谱和时间分布谱,并与试验做了比较.     

Beam test of signal cross-talk and transmission for LMPRC

A new prototype of large area Multi-gap Resistive Plate Chamber (MRPC) with long readout strips was built. This Long-strip Multi-gap Resistive Plate Chamber (LMRPC) is double stacked and has ten 250 μm-thick gas gaps. Signals are read out from the two ends of each strip with an active area of 50 cm×2.5 cm in each. The detector was tested at FOPI in GSI, using the secondary particles of proton beams (E=3.5 GeV) colliding with a Pb target. The results show that the LMRPC prototype has a time resolution of about 60-70 ps; the detecting efficiency is over 98% and the ratio of cross-talk is lower than 2%. The detector also has a good spatial resolution of 0.36 cm along the strip direction.     

PVC膜TlBr4-离子选择电极的研制和应用

关于Tl(Ⅲ)电极的研制已有文献^[1-3]报导,但尚未见应用实例。本文在文献^[3]液膜T1Br₄^-电极的基础上,改变条件研制了PVC膜TlBr₄^-电极,其稳定性、选择性和重现性有了较大提高,使电极更具有实用价值,以本电极为指示电极对TlBr₄^-乙基紫或丁基罗丹明B体系获得了良好的电位滴定曲线;应用本电极按改进的零点电位法拟定了适宜于测定烟灰中微量鈍的操作步骤,分析了实际样品,与光度法对照,相对误差小于10％。     

GEM气体探测器的增益特性

研制一种双层结构的GEM气体探测器用于X射线成像和带电粒子径迹测量.使用铜靶X射线管产生的高能量X射线对其气体放大倍数,电荷传输效率,增益稳定性进行测试.实验结果显示:在入射X射线通量为10⁵Hz/mm²时,双层GEM探测器的有效增益达到10⁴以上,并且具有长时间稳定性.     

利用MC模拟研究MRPC性能

利用Monte Carlo方法模拟了多气隙电阻板室(MRPC)的气体雪崩和信号收集过程,通过模拟与实验数据的比较分析,研究了MRPC粒子探测效率和信号幅度等性能,并讨论了一些外部条件的影响.     

A large-area GEM detector using a novel self-stretching technique

A Gas Electron Multiplier (GEM) detector with an effective area of 300 mm×300 mm has been constructed using a novel self-stretching technique, which allows a highly flexible and efficient GEM detector assembly free of glue or spacers. This makes the re-opening and repair of the GEM detectors possible and significantly reduces the scrap rate in the mass production of large-area GEM detectors. With the technique, the assembly time can be limited to a few hours, a factor of ten improvement compared to that using gluing techniques. The details of design and assembly procedure of the 300 mm×300 mm GEM detector are described in this paper. This detector was tested with 8 keV X-rays for the effective gain, energy resolution and performance uniformity. The results show that the typical energy resolution is 20% at an effective gain of about 10^4, with fairly good uniformity.     

倾斜多丝正比室辐射状阴极条感应电荷重心读出的定位性能研究

本文针对倾斜多丝室辐射状阴极条的具体结构,研究了阴极面上感应电荷密度分布,给出了四或五根条取样时重心读出定位修正函数和相应的定位精度,用⁵⁵Fe X射线进行了定位测量,实验和理论符合得较好.     

多丝正比室阴极感应电荷重心读出定位性能的研究

制作了一个带有阴极条的有效面积为100×100mm²的多丝正比室模型,测量了⁵⁵Fe的X射线(5.9keV)在阴极面上产生的感应电荷分布和多丝室沿阳极丝方向的位置分辨,研究了阴极条取样数对位置分辨的影响,最后和理论计算的结果进行了比较.     

多丝正比室W–S阴极条两维读出方法研究

对一种简便的多丝室楔形一条形(W–S)阴极的感应电荷分布进行了详细的计算,制作了100×100mm²的丝室模型,用55FeX射线测量丝室的定位精度,并获得入射X射线的二维图像.     

Energy calibration of a BC501A liquid scintillator using a γ-γ coincidence technique

An accurate energy calibration of a BC501A liquid scintillator by means of Compton scattering of γ-rays is described.The energy resolution and the position of the Compton edge have been precisely determined using a γ-γ coincidence technique and fitting the coincidence spectrum with a Gaussian function superimposed on a quadratic polynomial for the background.The position of the Compton edge relative to the position of the maximum and the half height of the distribution in dependence on the relevant energy resolution is discussed in detail.The results indicate that the maximum energy of the recoil Compton electron does not occur at the half height distribution but at 0.90±0.05 of the maximum height in the energy range considered.The energy resolution varies from 15.6% to 8.02% for electrons in the energy region from 0.5 MeV to 3 MeV.