Systematic study of the short-term instability of PbWO4 scintillator parameters under irradiation

Annenkov, Alexander; Auffray, E.; Chipaux, R.; Drobychev, G.; Fedorov, A.; Géléoc, Marie; Голубев, Н.; Korzhik, M.; Lecoq, P.; Lednev, A.A.; Ligun, A. B.; Missevitch, O.; Pavlenko, V. B.; Peigneux, J.P.; Singovski, A.

doi:10.1016/s1350-4487(97)00230-8

Cited by 56 publications

(27 citation statements)

References 6 publications

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“…This will be achieved by E/p calibration using electrons (mainly from W-boson decays) over a period of about one month [1]. However, while the crystals are radiation resistant, there are small residual changes in transparency [2] that occur rapidly for relatively small radiation doses. Recovery (annealing) takes place with a recovery time constant of about one week in the absence of radiation.…”

Section: Introductionmentioning

confidence: 99%

A study of the monitoring of radiation damage to CMS ECAL crystals, performed at X5-GIF

Davies

Peigneux

Singovski

2000

J. Phys. G: Nucl. Part. Phys.

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The ratio (R), defined as the fractional decrease in the beam signal divided by the fractional decrease in the light monitoring signal, was measured at the GIF-X5 facility for a set of 20 ECAL barrel crystals. The dependence of R on the wavelength of the injected monitoring light and its path-length in the crystals was studied. Measurements of the inter-crystal variation in R are presented for 10 pre-production crystals. Results on the dependence of signal loss on the irradiation profile are given. The use of lead filters, placed between a 137 Cs source and a crystal, to reproduce different longitudinal irradiation profiles has been tested.

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Section: Introductionmentioning

confidence: 99%

A study of the monitoring of radiation damage to CMS ECAL crystals, performed at X5-GIF

Davies

Peigneux

Singovski

2000

J. Phys. G: Nucl. Part. Phys.

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“…Although the magnitude of this damage is rather small, several percent for a collected dose of some MegaRads for the optimized crystals, a significant part of this effect appears after the first collected KiloRads [4]. This effect, along with a partial fast recovery [4], make PWO crystals unstable at the several percent level under the varying radiation conditions expected during LHC operation. It makes precise calorimeter response monitoring vitally important for interpreting the data.…”

Section: Introductionmentioning

confidence: 97%

Stabilized dye laser for crystal electromagnetic calorimeter monitoring

Fedorov¹,

Коржик²,

Lopatik³

et al. 2002

Nuclear Instruments and Methods in Physics Research Section A:

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“…The optical transmission of crystals will fluctuate [3], and consequently their light collection efficiency. In order to preserve the calibration precision of the instrument, both calibration with physical events, at a time scale of a few weeks, and continuous monitoring of the optical characteristics of the crystals are required [4].…”

Section: Introductionmentioning

confidence: 99%

Simulation of light collection in the CMS lead tungstate crystals with the program Litrani: coating and surface effects

Chipaux

Gentit

2002

Nuclear Instruments and Methods in Physics Research Section A:

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The accuracy of the lead tungstate electromagnetic calorimeter of the CMS experiment under construction at CERN relies, among other things, on the correction of the calibration parameter from variations dues to crystal ageing. This ageing will be measured by a so-called monitoring system, but the relation between monitoring and calibration parameter variations is not so trivial, and depends much on the overall optical characteristics of crystal and photodetector. We present here simulations done with the program Litrani based on real ageing data for a realistic CMS crystal with a defined surface quality (optically polished, with or without one lateral face slightly depolished), covered by coatings of various characteristics, from totally absorbing to nominal aluminum or diffusing medium. The correlation coefficient between monitoring and scintillation signals depends greatly on these characteristics, and varies between about 1.3 and more than 10 (the optimum being one).

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Systematic study of the short-term instability of PbWO4 scintillator parameters under irradiation

Cited by 56 publications

References 6 publications

A study of the monitoring of radiation damage to CMS ECAL crystals, performed at X5-GIF

A study of the monitoring of radiation damage to CMS ECAL crystals, performed at X5-GIF

Stabilized dye laser for crystal electromagnetic calorimeter monitoring

Simulation of light collection in the CMS lead tungstate crystals with the program Litrani: coating and surface effects

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