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The BESⅢ detector has a high-resolution electromagnetic calorimeter which can be used for low momentum μ-π identification. Based on Monte Carlo simulations, μ-π separation was studied. A multilayer perceptron neural network making use of the defined variables was used to do the identification and a good μ-π separation result was obtained. 相似文献
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Systematic investigations including both simulation and prototype tests have been done about the interpolating resistive readout structure with GEM (Gaseous Electron Multiplier) detector. From the simulation, we have a good knowledge of the process of charge diffusion on the surface of the readout plane and develop several reconstruction methods to determine the hit position. The total signal duration time of a typical event with the readout structure was about several hundred nanoseconds, which implied an ideal count rate up to 106 Hz. A stable working prototype was designed and fabricated after the simulation. Using 55Fe 5.9 keV X-ray, the image performance of the prototype was examined with flat field image and some special geometry shapes, meanwhile, an energy resolution of about 17% was obtained. 相似文献
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The two-dimensional interpolating readout, a new readout concept based on resistive anode structure, was studied for the micro-pattern gaseous detector. Within its high spatial resolution, the interpolating resistive readout structure leads to an enormous reduction of electronic channels compared with pure pixel devices, and also makes the detector more reliable and robust, which is attributed to its resistive anode relieving discharge. A GEM (gaseous electron multiplier) detector with 2D interpolating resistive readout structure was set up and the performance of the detector was studied with 55Fe 5.9 keV X-ray. The detector worked stably at the gain up to 3.5 × 104 without any discharge. An energy resolution of about 19%, and a spatial resolution of about 219 μm (FWHM) were reached, and good imaging performance was also obtained. 相似文献
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A kind of thick GEM-like gaseous electron multiplier (THGEM), which is mechanically an expansion of the GEM with its various dimensions being enlarged, is studied. The leak current of THGEM plates is measured. The effective gain and energy resolution of a single THGEM are studied with a source of 55Fe, and the effective gain of the single THGEM versus the electric field strength in the induction region is investigated. The results show that the leak current of THGEM plates is less than 200 pA. In an atmospheric-pressure standard gas mixture, 8×103 effective gain and about 32% energy resolution can be reached for the single-THGEM detector. 相似文献
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BESⅢ-CsI(Tl)晶体量能器采用FADC的DAQ电子学读出系统. 通过扫描信号幅度的分布寻找信号峰位. 为了降低扫描时间窗内(3μs)的低能本底计数、提高能量分辨和降低无效计数率, 除了传统的输出信号峰位(表征沉积能量)之外, 我们引出另一个较粗的时间信息, 即对应信号峰位的扫描步长数, 其步长精度为50ns.
本文将通过电子束流实验研究对这一时间信息的特点及如何利用时间信息进行详细的分析和讨论. 相似文献
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