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arXiv 1707.04456physics.ins-det
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强磁场中三重GEM探测器的uTPC簇重建的开发和测试

Development and Test of a uTPC Cluster Reconstruction for a Triple GEM Detector in Strong Magnetic Field

R. Farinelli, M. Alexeev, A. Amoroso, F. Bianchi, M. Bertani, D. Bettoni, N. Canale, A. Calcaterra, V. Carassiti, S. Cerioni, J. Chai, S. Chiozzi, G. Cibinetto,… 展开作者

R. Farinelli, M. Alexeev, A. Amoroso, F. Bianchi, M. Bertani, D. Bettoni, N. Canale, A. Calcaterra, V. Carassiti, S. Cerioni, J. Chai, S. Chiozzi, G. Cibinetto, A. Cotta Ramusino, F. Cossio, F. De Mori, M. Destefanis, T. Edisher, F. Evangelisti, L. Fava, G. Felici, E. Fioravanti, I. Garzia, M. Gatta, M. Greco, D. Jing, L. Lavezzi, C. Leng, H. Li, M. Maggiora, R. Malaguti, S. Marcello, M. Melchiorri, G. Mezzadri, G. Morello, S. Pacetti, P. Patteri, J. Pellegrino, A. Rivetti, M. D. Rolo, M. Savrié, M. Scodeggio, E. Soldani, S. Sosio, S. Spataro, L. Yang

摘要:

三重GEM原型的性能已经通过在欧洲核子研究中心的SPS测试区的H4线的μ子束进行了评估。利用电荷分布的重力场和微型时间投影室(\muTPC)两种聚类方法对两个平面样机的数据进行了离线重构和分析。关于空间分辨率,电荷质心簇重构在没有磁场的情况下表现得非常好:分辨率远低于100 \mum。随着磁场强度的增加,由于洛伦兹力的作用,分辨率几乎线性下降,洛仑兹力使电子雪崩位移、加宽和不对称。调整GEM原型的电场,我们可以在1特斯拉下实现前所未有的190 \mum的空间分辨率。为了提高在强磁场和倾斜径迹条件下的空间分辨率,研究了一种\muTPC团簇重构方法。这种读出模式利用GEM检测器和电子器件的良好时间分辨率来重建转换间隙内的粒子的轨迹。除了空间分辨率的提高之外,还可以提取关于轨迹角度的信息。新的聚类算法已被测试与对角线轨道,没有磁场显示的分辨率在100微米和150微米之间的入射角范围从10°到45°。研究表明,在1特斯拉磁场下具有类似性能。这是在磁场中首次使用具有三个GEM探测器的\muTPC读数。这项研究表明,组合读出能够保证稳定的性能在一个广泛的粒子动量和入射角,高达1特斯拉磁场。

英文摘要:

Performance of triple GEM prototypes has been evaluated by means of a muon beam at the H4 line of the SPS test area at CERN. The data from two planar prototypes have been reconstructed and analyzed offline with two clusterization methods: the enter of gravity of the charge distribution and the micro Time Projection Chamber (\muTPC). Concerning the spatial resolution, the charge centroid cluster reconstruction performs extremely well with no magnetic field: the resolution is well below 100 \mum . Increasing the magnetic field intensity, the resolution degrades almost linearly as effect of the Lorentz force that displaces, broadens and asymmetrizes the electron avalanche. Tuning the electric fields of the GEM prototype we could achieve the unprecedented spatial resolution of 190 \mum at 1 Tesla. In order to boost the spatial resolution with strong magnetic field and inclined tracks a \muTPC cluster reconstruction has been investigated. Such a readout mode exploits the good time resolution of the GEM detector and electronics to reconstruct the trajectory of the particle inside the conversion gap. Beside the improvement of the spatial resolution, information on the track angle can be also extracted. The new clustering algorithm has been tested with diagonal tracks with no magnetic field showing a resolution between 100 um and 150 um for the incident angle ranging from 10° to 45° . Studies show similar performance with 1 Tesla magnetic field. This is the first use of a \muTPC readout with a triple GEM detector in magnetic field. This study has shown that a combined readout is capable to guarantee stable performance over a broad spectrum of particle momenta and incident angles, up to a 1 Tesla magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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