论文标题
伊卡洛斯T600检测器中的空间电荷的研究
Study of space charge in the ICARUS T600 detector
论文作者
论文摘要
通过电离颗粒越过液体氩时间投影室（LAR-TPC）产生的正离子的积累可能会产生影响电离事件轨迹重建的电流场的扭曲。这些效果可能与在表面或浅深度下运行的大型LAR-TPC有关，在该探测器暴露于大量的宇宙射线中。已经对ICARUS T600 LAR-TPC中这种可能的场所畸变进行了详细研究，分析了2001年在表面在表面上操作的一个T600模块记录的宇宙MUON轨道样本。最大轨道失真显示出很少的mm与数字计算的预测非常吻合。作为交叉检查，对在LNGS Underground Laboratory的ICARUS T600运行期间记录的宇宙MUON样品进行了相同的分析，在该实验室中，宇宙射线通量受到因子$ \ sim 10^6 $ x 3400 m的水等效屏蔽的抑制。尚未观察到明显的失真，证实表面上测得的效果实际上是由于离子空间电荷引起的。
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.
