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arXiv physics/0604102physics.ins-det
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高能质子对PbWO4晶体闪烁光输出的损伤研究

High-energy proton induced damage study of scintillation light output from PbWO4 calorimeter crystals

P. Lecomte, D. Luckey, F. Nessi-Tedaldi, F. Pauss

摘要:

八PbWO 4晶体的CMS实验的电磁量能器在LHC已被照射在一个20 GeV/c的质子束高达5.4 E13 p/cm 2的注量。这些晶体在室温下储存在黑暗中,其损伤恢复已经进行了一年多。使用1 kGy/h的剂量率,对其他7个晶体进行了60 Co光子的比较辐照。利用宇宙射线对辐照晶体进行光输出测量,研究了强子是否对闪烁机制造成特定损伤的问题。光输出变化和光透射率变化之间的相关性被测量为质子辐照晶体和伽马辐照晶体相同。因此,在测量的精度和质子注量的探索范围内,没有额外的,强子特定的损害闪烁机制观察。

英文摘要:

Eight PbWO4 crystals produced for the electromagnetic calorimeter of the CMS experiment at LHC have been irradiated in a 20 GeV/c proton beam up to fluences of 5.4 E13 p/cm2. The damage recovery in these crystals, stored in the dark at room temperature, has been followed for over a year. Comparative irradiations with 60Co photons have been performed on seven other crystals using a dose rate of 1 kGy/h. The issue whether hadrons cause a specific damage to the scintillation mechanism has been studied through light output measurements on the irradiated crystals using cosmic rays. The correlation between light output changes and light transmission changes is measured to be the same for proton-irradiated crystals and for gamma-irradiated crystals. Thus, within the precision of the measurements and for the explored range of proton fluences, no additional, hadron-specific damage to the scintillation mechanism is observed.

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