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Information × Registration Number 0215U000694, 0113U006196 , R & D reports Title Participation in service of a hadron calorimeter of the detector CMS and its modernization for conditions of the increased luminosity of the Large Hadron Collider popup.stage_title Head Sorokin Pavel Vladimirovich, Registration Date 02-04-2015 Organization National Science Center "Kharkiv Institute of Physics and Technology popup.description2 Research of dependence of degradation of a svetovykhod on SCSN-81 (Kuraray) scintillator of which the active HCAL elements, from dose power are made is executed. Radiation was carried out on the linear accelerator of electrons of NSC KIPT of 10 MEV to an integrated dose 10 Mrad with rate of 730 Mrad / hour, 0.23 Mrad / hour and 0.018 Mrad / hour. Extent of damages of scintillator was determined by size concerning position of the center ?-пика (a source 239Pu) after radiation before position of the center ?-пика before radiation. It is shown that the level of updating of properties of scintillator decreases with reduction of power of a dose, and at the minimum power updating is practically absent. The received dependence on the power of a dose is considerable. This result is coordinated with the measurements executed in the early nineties within preparation of experiment on SSC (USA). Received in NSC KIPT result allow to explain a considerable divergence between real reduction of a signal from active elements of face hadron calorimeters (HE) of CMS after end of the first session of measurements on the LHC and made earlier (at a CMS installation design stage) estimates. For the purpose of comparison of indicators of radiation firmness for scintillators of different producers among themselves, research, similar described above, were carried out also for obrasts of UPS-923A scintillators (ISMA NAS of Ukraine). After radiation to 1.7 Mrad loss of a signal from UPS-923A scintillator appears slightly more, in comparison with SCSN-81, for all values of power of a dose at which this radiation was carried out. "Crushing" of the scintillation plates placed in "critical" zones of a calorimeter on rather narrow strips can be one of possible ways of reduction of effect of radiation damage to HE CMS at a size of a signal. Samples such to a poloso were also investigated on dependence of damage on dose power. Curve dependences of degradation of a svetovykhod on dose power which depend on the sizes of samples are received. Product Description popup.authors Бунецький Олег Олегович Горбенко Євген Степанович Кізка Валерій Олександрович Кліменко Кім Олександрович Левчук Леонід Геннадійович Лук'яненко Сергій Тимофійович Попов Віктор Пилипович Приставка Олександр Сергійович Сорокін Павло Володимирович Тижненко Микола Олександрович popup.nrat_date 2020-04-02 Close