Studies of an array of PbF2 Cherenkov crystals with large-area SiPM readout

A. T. Fienberg, L. P. Alonzi, A. Anastasi, R. Bjorkquist, D. Cauz, R. Fatemi, C. Ferrari, A. Fioretti, A. Fankenthal, C. Gabbanini, L. K. Gibbons, K. Giovanetti, S. D. Goadhouse, W. P. Gohn, T. P. Gorringe, D. W. Hertzog, M. Iacovacci, P. Kammel, J. Kaspar, B. KiburgL. Li, S. Mastroianni, G. Pauletta, D. A. Peterson, D. Počanić, M. W. Smith, D. A. Sweigart, V. Tishchenko, G. Venanzoni, T. D. Van Wechel, K. B. Wall, P. Winter, K. Yai

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

The electromagnetic calorimeter for the new muon (g-2) experiment at Fermilab will consist of arrays of PbF2 Cherenkov crystals read out by large-area silicon photo-multiplier (SiPM) sensors. We report here on measurements and simulations using 2.0-4.5 GeV electrons with a 28-element prototype array. All data were obtained using fast waveform digitizers to accurately capture signal pulse shapes vs. energy, impact position, angle, and crystal wrapping. The SiPMs were gain matched using a laser-based calibration system, which also provided a stabilization procedure that allowed gain correction to a level of 10-4 per hour. After accounting for longitudinal fluctuation losses, those crystals wrapped in a white, diffusive wrapping exhibited an energy resolution σ/E of (3.4±0.1)%/E/GeV, while those wrapped in a black, absorptive wrapping had (4.6±0.3)%/E/GeV. The white-wrapped crystals - having nearly twice the total light collection - display a generally wider and impact-position-dependent pulse shape owing to the dynamics of the light propagation, in comparison to the black-wrapped crystals, which have a narrower pulse shape that is insensitive to impact position.

Original languageEnglish
Pages (from-to)12-21
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume783
DOIs
StatePublished - May 21 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Funding

We thank Adam Para for the initial suggestion to test PbF 2 as a candidate material and for excellent advice on evaluating and choosing SiPM products. Tianchi Zhao negotiated the original contract with SICCAS and helped evaluate early samples. Carsten Hast, Keith Jobe and Zenon Szalata hosted this effort at the SLAC ESTB facility, which is supported under Department of Energy (DOE) contract DE-AC02-76SF00515 . This research was supported by the National Science Foundation (NSF) MRI program ( PHY-1337542 ), by the DOE Offices of Nuclear ( DE-FG02-97ER41020 ) and High-Energy Physics ( DE-SC0008037 ), by the NSF Physics Division ( PHY-1205792 , PHY-1307328 , PHY-1307196 , DGE-1144153 ), by the Istituto Nazionale di Fisica Nucleare (Italy) , and by the National Natural Science Foundation of China ( 11375115 ) and the Shanghai Pujiang Program ( 13PJ1404200 ).

FundersFunder number
DOE Offices of NuclearDE-FG02-97ER41020
Shanghai Pujiang Program, China13PJ1404200
National Science Foundation (NSF)PHY-1337542
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research LaboratoryDE-AC02-76SF00515
USA Physics DivisionPHY-1307328, DGE-1144153, PHY-1307196, PHY-1205792
Institute for High Energy PhysicsDE-SC0008037
National Natural Science Foundation of China (NSFC)11375115
Instituto Nazionale di Fisica Nucleare

    Keywords

    • Electromagnetic calorimeter
    • Lead-fluoride crystals
    • Silicon photomultiplier

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Instrumentation

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