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arXiv 1001.2276physics.ins-dethep-exnucl-ex
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ALICE实验硅漂移探测器中的电荷收集

Charge collection in the Silicon Drift Detectors of the ALICE experiment

B. Alessandro, R. Bala, G. Batigne, S. Beole', E. Biolcati, P. Cerello, S. Coli, Y. Corrales Morales, E. Crescio, P. De Remigis, D. Falchieri, G. Giraudo, P. Gi… 展开作者

B. Alessandro, R. Bala, G. Batigne, S. Beole', E. Biolcati, P. Cerello, S. Coli, Y. Corrales Morales, E. Crescio, P. De Remigis, D. Falchieri, G. Giraudo, P. Giubellino, R. Lea, A. Marzari Chiesa, M. Masera, G. Mazza, G. Ortona, F. Prino, L. Ramello, A. Rashevsky, L. Riccati, A. Rivetti, S. Senyukov, M. Siciliano, M. Sitta, M. Subieta, L. Toscano, F. Tosello

摘要:

对ALICE实验中硅漂移探测器(SDD)的电荷收集效率进行了详细的研究。已经实施了三种不同的方法来研究收集的电荷作为漂移时间的函数。第一种方法是用微型步进电机移动红外激光器,测量不同注入距离处的电荷。第二种方法是通过测量激光器在固定漂移距离处注入的电荷,改变漂移场,从而改变漂移时间。在最后一种方法中,通过测量大气μ子沉积的电荷来研究电荷收集效率随漂移时间的变化。这三种方法给出了一致的结果,并表明,在漂移期间没有电荷损失观察到的传感器类型在99%的SDD模块安装在ALICE内部跟踪系统。大气μ子也被用来测试零抑制的效果,零抑制通过擦除未通过噪声去除阈值的单元中的计数来减小数据大小。如所预期的,零抑制引入了重构电荷作为漂移时间的函数的依赖性,因为它切断了由扩散效应放大的电子云的尾部中的信号。这些测量还允许验证从探测器响应的详细蒙特卡罗模拟中提取并应用于离线数据重建的这种效应的校正。

英文摘要:

A detailed study of charge collection efficiency has been performed on the Silicon Drift Detectors (SDD) of the ALICE experiment. Three different methods to study the collected charge as a function of the drift time have been implemented. The first approach consists in measuring the charge at different injection distances moving an infrared laser by means of micrometric step motors. The second method is based on the measurement of the charge injected by the laser at fixed drift distance and varying the drift field, thus changing the drift time. In the last method, the measurement of the charge deposited by atmospheric muons is used to study the charge collection efficiency as a function of the drift time. The three methods gave consistent results and indicated that no charge loss during the drift is observed for the sensor types used in 99% of the SDD modules mounted on the ALICE Inner Tracking System. The atmospheric muons have also been used to test the effect of the zero-suppression applied to reduce the data size by erasing the counts in cells not passing the thresholds for noise removal. As expected, the zero suppression introduces a dependence of the reconstructed charge as a function of drift time because it cuts the signal in the tails of the electron clouds enlarged by diffusion effects. These measurements allowed also to validate the correction for this effect extracted from detailed Monte Carlo simulations of the detector response and applied in the offline data reconstruction.

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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