研究目的
Investigating the effects of radiation damage on the CMS ECAL Laser Monitoring system and proposing upgrades for the High-Luminosity LHC.
研究成果
The spy boxes have provided an excellent tool to measure the stability of the laser monitoring system. Further studies on the whole Run 2 data are needed to understand if the radiation hardness of the light distribution system is good enough for HL-LHC operation.
研究不足
The study is limited by the current precision of the transparency measurements (0.2%) and the need for further studies to understand if the radiation hardness of the light distribution system is sufficient for HL-LHC operation.
1：Experimental Design and Method Selection:
The study involves analyzing the transparency changes in lead tungstate crystals due to irradiation and proposing upgrades to the laser monitoring system for the High-Luminosity LHC.
2：Sample Selection and Data Sources:
Data from Run 2 of the LHC is used to compute crystal transparencies.
3：List of Experimental Equipment and Materials:
The CMS ECAL, consisting of 75848 lead tungstate crystals, and the laser monitoring system with blue and green lasers.
4：Experimental Procedures and Operational Workflow:
Laser light pulses are directed to individual crystals via a multi-level optical fiber system to measure transparency changes.
5：Data Analysis Methods:
The ratios of APD or VPT response to PN signal are used to compute crystals transparencies.
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