AI 中文总结
该研究开发用于重离子追踪的二维OPPAC原型，由平行板和CF4构成，利用电压建电场，带电粒子触发雪崩发光，通过SiPM阵列光学读出及DAQ系统处理信号，测试结果显示其位置分辨率达亚毫米级且线性度良好。
AI 中文摘要
我们报告了用于重离子追踪的二维光学平行板雪崩计数器 (OPPAC) 原型开发所取得的进展。该装置由两块有效面积为10×10平方厘米的均匀薄平行板组成，板间间隙为3毫米，间隙内填充低压（高达50托）的四氟甲烷 (CF4)。通过在平行板间施加电压差，在间隙内建立均匀电场。带电粒子穿过气隙触发电子雪崩时产生电致发光，由围绕气隙部署的四个准直硅光电倍增管 (SiPM) 阵列组成的光学读出装置检测光。通过计算SiPM阵列内光分布的重心来处理所有SiPM收集的光信号，从而重建粒子位置。SiPM信号由基于TPC通用电子设备 (GET) 的数据采集 (DAQ) 系统读出和处理。用α粒子源和100 MeV/u 40Ca束进行测试的初步结果表明，固有位置分辨率达到亚毫米级（σ_det = 0.7毫米），同时在整个探测器有效区域保持良好的线性度。
英文摘要
We report the progress achieved on the development of a two-dimensional Optical Parallel-Plate Avalanche Counter (OPPAC) prototype for heavy-ion tracking. The device consists of two uniform thin parallel plates of 10 x 10 cm2 effective area, separated by a gap of 3 mm. The gap is filled with Tetrafluoromethane (CF4) at low pressure (up to 50 Torr). By applying a voltage difference between parallel plates, a uniform electric field is established within the gap. Electroluminescence emission is produced during the electron avalanche triggered by a charged particle that crosses the gas gap. The light is detected by an optical readout comprising four arrays of collimated Silicon Photomultipliers (SiPMs) deployed around the gas gap. The position of the particles is reconstructed by processing the light signals collected by all the SiPMs by computing the center of gravity of the light distribution within the SiPM arrays. The SiPM signals are read out and processed by a data acquisition (DAQ) system based on the General Electronics for TPC (GET). Preliminary results from a test with an alpha-particle source and a 100 MeV/u 40Ca beam demonstrate a sub-millimetre intrinsic position resolution sigma_det = 0.7 mm) while preserving good linearity over the entire detector active area.
