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arXiv 2001.08934physics.ins-dethep-ex
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ICARUS T600探测器中空间电荷的研究

Study of space charge in the ICARUS T600 detector

M. Antonello, B. Baibussinov, V. Bellini, F. Boffelli, M. Bonesini, A. Bubak, S. Centro, K. Cieslik, A. G. Cocco, A. Dabrowska, A. Dermenev, A. Falcone, C. Farn… 展开作者

M. Antonello, B. Baibussinov, V. Bellini, F. Boffelli, M. Bonesini, A. Bubak, S. Centro, K. Cieslik, A. G. Cocco, A. Dabrowska, A. Dermenev, A. Falcone, C. Farnese, A. Fava, A. Ferrari, D. Gibin, S. Gninenko, A. Guglielmi, M. Haranczyk, J. Holeczek, M. Kirsanov, J. Kisiel, I. Kochanek, J. Lagoda, A. Menegolli, G. Meng, C. Montanari, C. Petta, F. Pietropaolo, P. Picchi, A. Rappoldi, G. L. Raselli, M. Rossella, C. Rubbia, P. Sala, A. Scaramelli, F. Sergiampietri, M. Spanu, M. Szarska, M. Torti, F. Tortorici, F. Varanini, S. Ventura, C. Vignoli, H. Wang, X. Yang, A. Zalewska, A. Zani

摘要:

电离粒子穿过液氩时间投影室(LAr-TPC)产生的正离子的积累可能产生电漂移场的畸变,影响电离事件的径迹重建。这些效应可能与在地表或浅深度工作的大型LAr-TPC有关,在这些地方,探测器暴露在大量的宇宙射线通量中。通过分析2001年在地面运行的T600模块记录的宇宙μ子径迹样本,详细研究了ICARUS T600 LAr-TPC中这种可能的场畸变。最大径迹畸变为几mm,与数值计算的预测结果吻合较好。作为一项交叉检查,对LNGS地下实验室ICARUS T600运行期间记录的宇宙μ介子样本进行了同样的分析,其中宇宙射线通量被3 400米水当量屏蔽层抑制了$\sim 10^6$。没有明显的失真已被观察到,确认在表面上测量的效果实际上是由于离子空间电荷。

英文摘要:

The accumulation of positive ions, produced by ionizing particles crossing Liquid Argon Time Projection Chambers (LAr-TPCs), may generate distortions of the electric drift field affecting the track reconstruction of the ionizing events. These effects could become relevant for large LAr-TPCs operating at surface or at shallow depth, where the detectors are exposed to a copious flux of cosmic rays. A detailed study of such possible field distortions in the ICARUS T600 LAr-TPC has been performed analyzing a sample of cosmic muon tracks recorded with one T600 module operated at surface in 2001. The maximum track distortion turns out to be of few mm in good agreement with the prediction by a numerical calculation. As a cross-check, the same analysis has been performed on a cosmic muon sample recorded during the ICARUS T600 run at the LNGS underground laboratory, where the cosmic ray flux was suppressed by a factor $\sim 10^6$ by 3400 m water equivalent shielding. No appreciable distortion has been observed, confirming that the effects measured on surface are actually due to ion space charge.

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