The study that we present is part of the preparation work for the setup of the FOOT (FragmentatiOn Of Target) experiment whose main goal is the measurement of the double differential cross sections of fragments produced in nuclear interactions of particles with energies relevant for particle therapy. The present work is focused on the characterization of the gas-filled drift chamber detector composed of 36 sensitive cells, distributed over two perpendicular views. Each view consists of six consecutive and staggered layers with three cells per layer. We investigated the detector efficiency and we performed an external calibration of the space–time relations at the level of single cells. This information was then used to evaluate the drift chamber resolution. An external tracking system realized with microstrip silicon detectors was adopted to have a track measurement independent on the drift chamber. The characterization was performed with a proton beam at the energies of 228 and 80 MeV. The overall hit detection efficiency of the drift chamber has been found to be $0.929\pm 0.008$, independent on the proton beam energy. The spatial resolution in the central part of the cell is about $150\pm 10$ $\mathrm{\mu }$ m and $300\pm 10$ $\mathrm{\mu }$ m and the corresponding detector angular resolution has been measured to be $1.62\pm 0.16$ mrad and $2.1\pm 0.4$ mrad for the higher and lower beam energies, respectively. In addition, the best value on the intrinsic drift chamber resolution has been evaluated to be in the range $60-100$ $\mathrm{\mu }$ m. In the framework of the FOOT experiment, the drift chamber will be adopted in the pre-target region, and will be exploited to measure the projectile direction and position, as well as for the identification of pre-target fragmentation events.

我们目前的研究是FOOT（目标碎片）实验建立准备工作的一部分，该实验的主要目的是测量粒子与核治疗相关的能量与核的相互作用中产生的碎片的双微分截面。目前的工作集中在由36个敏感单元组成的充气式漂移室检测器的特性分析中，这些检测器分布在两个垂直视图上。每个视图均包含六个连续且交错的层，每层三个单元。我们研究了探测器的效率，并在单细胞水平上对时空关系进行了外部校准。然后，此信息用于评估漂移室分辨率。采用由微带硅探测器实现的外部跟踪系统，可以独立于漂移室进行跟踪测量。用质子束以228和80 MeV的能量进行表征。发现漂移室的总命中检测效率为$0。929\pm 0。008$，独立于质子束能量。单元中央部分的空间分辨率约为$150\pm 10$ $\mathrm{\mu }$ m和 $300\pm 10$ $\mathrm{\mu }$ m和相应的探测器角分辨率已测量为 $\mathrm{1个}。62\pm 0。16$ mrad和 $2。\mathrm{1个}\pm 0。4$mrad分别代表较高和较低的光束能量。此外，本征漂移室分辨率的最佳值已评估为在$60-100$ $\mathrm{\mu }$米 在FOOT实验的框架中，漂移室将被用于目标前区域，并将被用于测量弹丸的方向和位置，以及识别目标前碎片事件。