Performance of very thin Gd2SiO5 scintillator bars for the LHCf experiment

T. Suzuki, K. Kasahara, K. Kawade, T. Murakami, K. Masuda, T. Sako, Shoji Torii

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    To increase the radiation resistivity of the calorimeter, the LHCf group plans to replace its plastic scintillator with Gd2SiO5 (GSO) scintillator. In this report, we present the basic performance of very thin GSO scintillator bars that will replace the scintillating fibers employed as the position sensitive part of the current LHCf detector. The size of a bar is 1 mm × 1 mm × 40 mm. White acrylic paint was painted on one group of GSO bars and a second group was unpainted. After observing a clear peak of cosmic ray muons corresponding to 3 to 4 photoelectrons, a quantitative test was performed by using a 290 MeV/n carbon beam at HIMAC in Japan. The non-painted bars have less position dependence of light collection efficiency (effective attenuation length is about 140 mm) and less piece-to-piece variation. The unpainted bars show about 8% cross talk between adjacent bars which is larger than the painted ones. However, for estimating the center of a cascade shower inside the calorimeter, uniformity of light collection is more important than cross talk, so we have decided to use non-painted bars in the LHCf detector. A simulation of a 100 GeV electron injected in the center of the detector shows that position dependence and cross talk cause only a 0.04 mm shift of the shower centroid without any correction applied. This shows that these effects are relatively small compared to the uncertainty of the beam center position which was 1 mm for the LHCf experiments already performed at s =7 TeV.

    Original languageEnglish
    Article numberT01007
    JournalJournal of Instrumentation
    Volume8
    Issue number1
    DOIs
    Publication statusPublished - 2013 Jan

    Fingerprint

    Scintillator
    Phosphors
    scintillation counters
    Crosstalk
    Experiment
    Calorimeter
    Experiments
    Detector
    showers
    Detectors
    Calorimeters
    calorimeters
    detectors
    Cosmic Rays
    scintillating fibers
    Resistivity
    Centroid
    Cosmic rays
    Japan
    Uniformity

    Keywords

    • Calorimeter methods
    • Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)

    ASJC Scopus subject areas

    • Instrumentation
    • Mathematical Physics

    Cite this

    Suzuki, T., Kasahara, K., Kawade, K., Murakami, T., Masuda, K., Sako, T., & Torii, S. (2013). Performance of very thin Gd2SiO5 scintillator bars for the LHCf experiment. Journal of Instrumentation, 8(1), [T01007]. https://doi.org/10.1088/1748-0221/8/01/T01007

    Performance of very thin Gd2SiO5 scintillator bars for the LHCf experiment. / Suzuki, T.; Kasahara, K.; Kawade, K.; Murakami, T.; Masuda, K.; Sako, T.; Torii, Shoji.

    In: Journal of Instrumentation, Vol. 8, No. 1, T01007, 01.2013.

    Research output: Contribution to journalArticle

    Suzuki, T, Kasahara, K, Kawade, K, Murakami, T, Masuda, K, Sako, T & Torii, S 2013, 'Performance of very thin Gd2SiO5 scintillator bars for the LHCf experiment', Journal of Instrumentation, vol. 8, no. 1, T01007. https://doi.org/10.1088/1748-0221/8/01/T01007
    Suzuki, T. ; Kasahara, K. ; Kawade, K. ; Murakami, T. ; Masuda, K. ; Sako, T. ; Torii, Shoji. / Performance of very thin Gd2SiO5 scintillator bars for the LHCf experiment. In: Journal of Instrumentation. 2013 ; Vol. 8, No. 1.
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