For optimal operations in the high radiation and pileup environment of the HL-LHC, the CMS-HGCAL requires precise timing information at the level of 30 ps (RMS) for a particle shower. The time measurement in silicon detector modules is performed using a per-channel time-of-arrival discriminator coupled with charge measurement to correct for the time-walk. The module design includes access holes in the PCB and in the sensor passivation to enable infrared laser light to be injected directly into the sensor cells. We present the calibration and timing-in of the system used to perform measurements.

中文翻译：

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开发用于 CMS HGCAL 硅模块定时性能测量的激光系统

为了在 HL-LHC 的高辐射和堆积环境中实现最佳操作，CMS-HGCAL 需要 30 ps (RMS) 水平的粒子簇射精确定时信息。硅探测器模块中的时间测量是使用每通道到达时间鉴别器和电荷测量来执行的，以校正时间行走。该模块设计包括 PCB 和传感器钝化中的检修孔，使红外激光能够直接注入传感器单元。我们介绍用于执行测量的系统的校准和计时。