Alignment of the CLAS12 central hybrid tracker with a Kalman Filter

Alignment of the CLAS12 central hybrid tracker with a Kalman Filter
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CLAS12 中央混合跟踪器与卡尔曼滤波器的对齐

DOI:
10.1016/j.nima.2023.168032
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发表时间:
2023
期刊:
Detectors and Associated Equipment
影响因子:
--
通讯作者:
Gayoso, C. Ayerbe
Gayoso, C. Ayerbe
中科院分区:
--
文献类型:
--
作者:
Paul, S.J.;Peck, A.;Arratia, M.;Gotra, Y.;Ziegler, V.;De Vita, R.;Bossù, F.;Defurne, M.;Atac, H.;Gayoso, C. Ayerbe

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几个因素可能导致难以对准跟踪检测器的传感器,包括大量的模块、多种类型的检测器技术以及传感器上的非线性条带图案。这三个因素中的后两个适用于CLAS12 CVT,这是一种混合检测器,由具有非平行条带的平面硅传感器和具有位于5 T超导螺线管内的纵向和弧形条带的圆柱形微兆气体传感器组成。为了对准这个探测器,我们使用了卡尔曼对准算法,该算法考虑了对准参数之间的相关性,而不需要对大型矩阵进行耗时的求逆。这是该算法首次适用于混合技术、非平行条带和弯曲传感器。我们提出的CLAS12 CVT的第一次对齐使用从宇宙射线和从一个目标的磁场关闭的直轨道的结果。运行此程序后,我们实现了10 μ m水平的对准,并大大降低了剩余光谱的宽度。这些结果证明了该算法的灵活性和适用性,未来使用的CLAS12 CVT和其他混合或弯曲的跟踪器,如那些建议为未来的电子离子对撞机。
Several factors can contribute to the difficulty of aligning the sensors of tracking detectors, including a large number of modules, multiple types of detector technologies, and non-linear strip patterns on the sensors. The latter two of these three factors apply to the CLAS12 CVT, which is a hybrid detector consisting of planar silicon sensors with non-parallel strips, and cylindrical micromegas sensors with longitudinal and arc-shaped strips located within a 5 T superconducting solenoid. To align this detector, we used the Kalman Alignment Algorithm, which accounts for correlations between the alignment parameters without requiring the time-consuming inversion of large matrices. This is the first time that this algorithm has been adapted for use with hybrid technologies, non-parallel strips, and curved sensors. We present the results for the first alignment of the CLAS12 CVT using straight tracks from cosmic rays and from a target with the magnetic field turned off. After running this procedure, we achieved alignment at the level of 10 μ m, and the widths of the residual spectra were greatly reduced. These results attest to the flexibility of this algorithm and its applicability to future use in the CLAS12 CVT and other hybrid or curved trackers, such as those proposed for the future Electron-Ion Collider.
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DOI: --
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