64通道一维位置灵敏电流分布探测器及其数据获取系统

针对高流强粒子束与绝缘毛细管相互作用的特点, 设计制作了一套64通道一维位置灵敏电流分布探测器及其配套的数据获取系统, 该探测器可分辨最小直径为1 mm的束斑, 通过数据获取系统可实现可视化自动数据采集。 用2 nA和200—2000 eV电子对探测器进行了定标, 并用10 μA和2000 eV的电子束穿越锥形毛细管后的出射电子, 对探测器及数据获取系统进行测试, 获得了出射粒子的位置分布谱及能量信息。 A 64 channel position sensitive current distribution detector with 1 mm position resolution was developed, while the data acquisition system is based on the LabVIEW software. The test result obtained by using a 2 nA, 200—2000 eV electron beam deflecting by different voltages and the position spectra of 10 μA, 2000 eV electrons transmitted through a glass capillary was measured. The result indicated that the detector can be used to detect the charged particles with strong beam current through the capillary.     

A high-precision multi-channel TAC and QAC module for the neutron detection wall

A single width NIM module that includes eight channels of the time-to-amplitude converter(TAC) and the charge-to-amplitude converter(QAC) is introduced in the paper, which is designed for the large neutron wall detector to measure charge(energy) and time interval simultaneously. The module adopts a high precision gated integration circuit to realize TAC and QAC. The input range of TAC is from 30 ns to 1 μs, and the input range of QAC is from 40 p C to 600 p C. The linearity error of TAC is lower than 1.28%, and the time resolution of TAC is less than 0.871%. The linearity error of QAC is lower than 0.81%, and the resolution of QAC is better than 0.936%.     

应用于在束PET的光纤链路设计

医用重离子加速器(Heavy-Ion Medical Machine,HIMM)中安装在束正电子发射断层扫描装置(In-beam Positron Emission Tomography,In-beam PET)可实现治疗时对肿瘤靶区的照射剂量和位置分布的实时监测功能.在束PET工作时,事件经探测器阵列采集,由前端数据...     

塑料闪烁体阵列探测器读出ASIC中峰值保持电路的设计

塑料闪烁体阵列探测器(PSD,简称塑闪阵列探测器)的输出信号经过前置放大器和滤波成形电路后输出准高斯波形,利用峰值保持电路可对准高斯波形信号的峰值进行采样和保持,以便后续的电子学系统对其进行进一步的分析。本工作采用180 nm CMOS工艺设计并实现了一款峰值保持电路ASIC芯片,每通道主要由跨导放大器(OTA)、电流镜和充电电容三部分电路组成。实验室电子学功能和性能测试结果表明:峰值保持电路功能良好;输入动态范围为33~940 mV,非线性误差优于0.8%,下垂速率好于8.6 μV/μs,峰值探测延迟时间小于35 ns,芯片单通道静态功耗为825 μW,达到设计要求。