Light monitoring will serve as an intercalibration for Compact Muon Solenoid (CMS) lead tungstate crystals in situ at the Large Hadronic Collider, which is crucial for maintaining crystal calorimeter's subpercent constant term in the energy resolution. This paper presents the design of the CMS electromagnetic calorimeter monitoring light source and high-level distribution system. The correlations between variations of the light output and the transmittance for the CMS choice of yttrium-doped PbWO/sub 4/ crystals were investigated and were used to study monitoring linearity and sensitivity as a function of wavelength. The monitoring wavelength was determined so that a good linearity as well as adequate sensitivity can be achieved. The performance of a custom manufactured tunable laser system is presented. Issues related to monitoring precision are discussed. (12 refs).
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机译：在大型强子对撞机上，光监测将作为紧凑型μon螺线管（CMS）钨酸铅原位晶体的相互校准，这对于保持晶体热量计的能量分辨率低于100％恒定而言至关重要。本文介绍了CMS电磁热量计监控光源和高级配电系统的设计。研究了掺钇的PbWO / sub 4 /晶体CMS选择的光输出变化与透射率之间的相关性，并用于研究监测线性和灵敏度与波长的关系。确定监视波长，以便可以实现良好的线性度和足够的灵敏度。介绍了定制制造的可调激光器系统的性能。讨论了与监视精度有关的问题。 （12个裁判）。
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