Performance study of a prototype pure CsI calorimeter for the KOTO experiment

Iwai, E.; Lee, J.W.; Masuda, Takahiko; McFarland, Duncan; Nakaya, Y.; Ri, Y.D.; Sato, Kazufumi; Shiomi, K.; Sugiyama, Yasuyuki; Tajima, Y.; Tecchio, M.; Togawa, M.; Tung, Y. C.; Yamanaka, T.

doi:10.1016/j.nima.2015.02.046

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…The time resolution σ t as a function of the energy deposition has been measured using three different techniques that consistently show that σ t ranges from 250 ps at 22 MeV to about 120 ps above 50 MeV. These results satisfy the Mu2e requirements and also significantly improve the timing resolution achievable when using undoped CsI at these low energies compared to present results in literature [6,7] thanks to the use of SiPM and high frequency waveform digitizer boards.…”

Section: Discussionsupporting

confidence: 71%

“…The characteristics of the undoped CsI are a reasonable match to the Mu2e requirements: light yield (2000 photons/MeV), radiation length (1.9 cm) and Molière radius (3.6 cm). Time resolution better 2017 JINST 12 P05007 than 0.5 ns has been recently measured with an undoped CsI calorimeter at 100 MeV using a PMTbased readout combined with a signal waveform digitization at 125 Msps [6,7]. The tests discussed in this paper are motivated by the development of a new generation of UV-extended SiPM array 4 × 4 12 × 12 mm 2 from Hamamatsu [8] that improves the photo-detection efficiency (PDE) close to the wavelength emission peak of undoped CsI.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the energy and time resolution of a undoped CsI + MPPC array for the Mu2e experiment

et al. 2017

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Abstract. This paper describes the measurements of energy and time response and resolution of a 3 × 3 array made of undoped CsI crystals coupled to large area Hamamatsu Multi Pixel Photon Counters. The measurements have been performed using the electron beam of the Beam Test Facility in Frascati (Rome, Italy) in the energy range 80-120 MeV. The measured energy resolution, estimated with the FWHM, at 100 MeV is 16.4%. This resolution is dominated by the energy leakage due to the small dimensions of the prototype. The time is reconstructed by fitting the leading edge of the digitized signals and applying a digital constant fraction discrimination technique. A time resolution of about 110 ps at 100 MeV is achieved.

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Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Measurement of the energy and time resolution of a undoped CsI + MPPC array for the Mu2e experiment

et al. 2017

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“…However, time resolutions better than 1 ns have been reported in the literature, see for example [52]. Recently, time resolution better than 0.5 ns was measured with the undoped CsI calorimeter at 100 MeV using the PMT-based readout combined with the signal waveform digitization at 125 MHz [53].…”

Section: Calorimeter Prototype Testmentioning

confidence: 99%

The Mu2e crystal calorimeter and improvements in the $\mu^-\mbox{N} \to e^-\mbox{N}$ search sensitivity

Pezzullo¹

2016

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“…An electromagnetic calorimeter (CSI), consisting of 2716 50-cm-long undoped cesium iodide crystals, measured the energies and hit positions of incident photons from K L decays. The central and outer regions of CSI were made of 2.5 × 2.5 cm 2 and 5.0 × 5.0 cm 2 crystals in cross section, respectively [9,10]. The crystals were stacked inside a 1.9-m-diameter cylinder, leaving a central 20 × 20 cm 2 hole for the beam path.…”

mentioning

confidence: 99%