Radiation-hardness measurements of high content quartz fibres irradiated with 24GeV protons up to 1.25Grad

Cankoçak, K.; Bakirci, M. N.; Çerçi, S.; Gülmez, E.; Merlo, J.-P.; Onel, Y.; Özok, F.; Schmidt, Iván; Sönmez, N.

doi:10.1016/j.nima.2007.10.024

Cited by 30 publications

(21 citation statements)

References 3 publications

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“…The station was augmented and altered in order to test 1800 R7600-200-M4 PMTs as they arrive in batches of 100 from the manufacturer. All the tests have been performed in light tight boxes, and any light used on the PMTs was passed through a blue filter, in accordance with the radiation damage studies suggesting to lose UV light tranmission within quartz fibers [14,15].…”

Section: Pmt Test Setup and Resultsmentioning

confidence: 99%

Characterization of 1800 Hamamatsu R7600-M4 PMTs for CMS HF Calorimeter upgrade

et al. 2014

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The Hadronic Forward calorimeters of the CMS experiment are Cherenkov calorimeters that use quartz fibers and 1728 photomultiplier tubes (PMTs) for readout. The CMS detector upgrade project requires the current Hamamatsu R7525 PMTs to be replaced with 4-anode, high quantum efficiency R7600-M4 PMTs. The new PMTs will improve the detector resolution, as well as the capability of removing fake events due to signal created in the glass window of the PMT. Here, we report the dark current, anode gain, transit time, transit time spread, pulse width, rise time, and linearity measurements performed on 1800 Hamamatsu R7600-200-M4 PMTs.

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Section: Pmt Test Setup and Resultsmentioning

confidence: 99%

Characterization of 1800 Hamamatsu R7600-M4 PMTs for CMS HF Calorimeter upgrade

et al. 2014

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“…The radiation damage of quartz fibers for visible light was extensively studied for CMS HF [7,8,9]. It was shown that the best radiation hardness for visible light can be obtained with quartz fibers with pure silica -high OH − core and F -doped silica cladding.…”

Section: Selection Of Componentsmentioning

confidence: 99%

Upgrade of the monitoring system of LHCb ECAL

Guz

Konoplyannikov

Perret

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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The LHCb ECAL is a shashlik calorimeter of 6016 cells, covering 7.68×6.24 m 2 area. To monitor the readout chain of each ECAL cell, the LHCb ECAL is equipped with a LED based monitoring system. During the LHC Run I (2009-2012 it was found that the precision of the monitoring suffers from the radiation degradation of transparency of polystyrene clear fibers used to transport the LED light to the ECAL photomultipliers. In order to improve the performance of the monitoring system, and especially in view of significant increase of LHCb working luminosity foreseen after 2018, the present plastic fibers have been replaced by radiation hard quartz fibers. The design of the upgraded version of the LHCb ECAL monitoring system is described here. The usage and performance of the new system for the ECAL calibration during the LHCb Run II are discussed.

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“…It is expected however that active elements of HF (quartz fibers + PMTs) survive these levels of radiation with limited deterioration: fibers' optical transmission is expected to be degraded by ≤ 50% after 10 years of LHC operation and quartz fibers are practically insensitive to neutrons and to low energy particles from decays of activated radionuclides (no Cherenkov light).The PMTs are properly shielded against radiation emerging from the absorber region and maintenance of read-out boxes will be performed with the help of semi-robotic extractor tools. HF is equipped with radiation monitors located at the periphery of the detector, and with a system (Raddam) to measure the transmission properties of few reference quartz fibers embedded in the absorber, as a function of the absorbed doses [22]. Such a monitoring system will be extremely useful to follow-up the degradation of the calorimeter response and provide the appropriate corrections, to maintain the quality of the HF calibration.…”

Section: Conclusion: the Fate Of Hf Calorimetersmentioning

confidence: 99%

The CMS-HF quartz fiber calorimeters

Penzo

Onel

2009

J. Phys.: Conf. Ser.

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Abstract:Two hadronic forward (HF) calorimeters extend the acceptance of CMS at large rapidities and are built with radiation-hard components (steel absorbers and quartz fibers) to resist the severe radiation levels in the forward regions. Very high energy jets can be measured in HF, by detecting Cherenkov light emitted by shower particles in the quartz fibers. The HF calorimeters are now installed in the underground CMS cavern; after commissioning, the detectors are being prepared for beam. Progress in calibration work and current plans for the HF calorimeters during the initial LHC runs are summarized.

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Radiation-hardness measurements of high content quartz fibres irradiated with 24GeV protons up to 1.25Grad

Cited by 30 publications

References 3 publications

Characterization of 1800 Hamamatsu R7600-M4 PMTs for CMS HF Calorimeter upgrade

Characterization of 1800 Hamamatsu R7600-M4 PMTs for CMS HF Calorimeter upgrade

Upgrade of the monitoring system of LHCb ECAL

The CMS-HF quartz fiber calorimeters

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