Developement of high precision visualization system for high intensity particle beams

本研究的目的是开发能够在高速率环境下测量粒子轨迹并将其可视化的探测器系统。为此，我们(1)构建了0.5 mm多线比例腔，并对其性能进行了研究；(2)设计并制作了32 ch紧凑的MWPC前置放大器系统；(3)制作了0.5 mm间距的硅条探测器系统，并研究了该系统在高辐射剂量下的工作程度。我们一直使用2.5 mm的漂移室对介子和介子等高强度二次光束进行各种实验。然而，由于我们正进入具有更高光束强度的二次粒子束的新阶段，因此开发高分辨率的跟踪设备是非常重要的。与2.5 mm漂移室相比，0.5 mm MWPC每根线的计数率降低了一个数量级，因此可以处理10倍高的颗粒强度。然而，它会给我们更好的位置分辨率。用ar -异丁烷气体对0.5 mm MWPC进行了测试，结果表明，该燃烧室具有合理的平台，并且与魔气混合效果良好。此外，在4ch放大器- shaper - discriminator芯片的基础上，开发了一种密度为原来两倍的32ch前置放大器。结果表明，该系统性能良好，高集成度的读出系统已经投入使用。在此基础上，成功研制了一种0.5 mm间距的固态硬盘，该固态硬盘集成了3个48 ch前置放大器形状鉴别器ASIC芯片，并将其用于电子能谱仪的焦平面探测系统。

The aim of the present study is to develop detector systems capable of measuring particle tracks and visualize them under high rate environment. To this end, we have(1) constructed 0.5 mm multiwire proportional chamber and investigated its performance,(2) designed and fabricated 32 ch compact preamplifier system for MWPC and,(3) fabricated 0.5 mm pitch silicon strip detector system and studied to what extent the system works under high radiation dose.We have been using 2.5 mm drift chamber for various experiments with high intensity secondary beams such as pions and kaons. However, since we are entering into the new phase that secondary particle beams with much higher beam intensity are available, it is very important to develop high resolution tracking devices. Compared with the 2.5 mm drift chamber, the 0.5 mm MWPC will have one order of magnitude less count rate per wire, thus can handle 10 times higher particle intensity. Yet, it will give us better position resolution.The 0.5 mm MWPC was tested with Ar-Isobutane gas and it was found the chamber present reasonable plateau and works quite well with the magic gas mixture.In addition, a new 32 ch preAmplifier which has twice density was developed based on 4 ch Amplifier-Shaper-Discriminator chips. It showed good performance and the high-integration read-out system is now ready for use.Furthermore, a 0.5 mm pitch SSD which are integrated with the three 48 ch-preAmp-shaper-discriminator ASIC chips has been successfully developed and it has been used as a focal plane detector system of the electron spectrometer.