Photon-veto counters at the outer edge of the endcap calorimeter for the KOTO experiment

T. Matsumura; T. Shinkawa; H. Yokota; E. Iwai; T. K. Komatsubara; J. W. Lee; G. Y. Lim; J. Ma; T. Masuda; H. Nanjo; T. Nomura; Y. Odani; Y. D. Ri; K. Shiomi; Y. Sugiyama; S. Suzuki; M. Togawa; Y. Wah; H. Watanabe; T. Yamanaka

doi:10.1016/j.nima.2015.05.036

Photon-veto counters at the outer edge of the endcap calorimeter for the KOTO experiment

T. Matsumura, T. Shinkawa, H. Yokota, E. Iwai, T. K. Komatsubara, J. W. Lee, G. Y. Lim, J. Ma, T. Masuda, H. Nanjo, T. Nomura, Y. Odani, Y. D. Ri, K. Shiomi, Y. Sugiyama, S. Suzuki, M. Togawa, Y. Wah, H. Watanabe, T. Yamanaka

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The Outer-Edge Veto (OEV) counter subsystem for extra-photon detection from the backgrounds for the KL0→^π0νν¯ decay is located at the outer edge of the endcap CsI calorimeter of the KOTO experiment at J-PARC. The subsystem is composed of 44 counters with different cross-sectional shapes. All counters are made of lead and scintillator plates and read out through wavelength-shifting fibers. In this paper, we discuss the design and performances of the OEV counters under heavy load (~8tons/^m2) in vacuum. For 1-MeV energy deposit, the average light yield and time resolution are 20.9 photo-electrons and 1.5 ns, respectively. Although no pronounced peak by minimum-ionizing particles is observed in the energy distributions, an energy calibration method with cosmic rays works well in monitoring the gain stability with an accuracy of a few percent.

Original language	English
Pages (from-to)	19-31
Number of pages	13
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	795
DOIs	https://doi.org/10.1016/j.nima.2015.05.036
Publication status	Published - Jul 10 2015
Externally published	Yes

Keywords

Energy calibration
J-PARC
KOTO
Kaon rare decay
Lead-scintillator sandwich
WLS-fiber readout

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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10.1016/j.nima.2015.05.036

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Matsumura, T., Shinkawa, T., Yokota, H., Iwai, E., Komatsubara, T. K., Lee, J. W., Lim, G. Y., Ma, J., Masuda, T., Nanjo, H., Nomura, T., Odani, Y., Ri, Y. D., Shiomi, K., Sugiyama, Y., Suzuki, S., Togawa, M., Wah, Y., Watanabe, H., & Yamanaka, T. (2015). Photon-veto counters at the outer edge of the endcap calorimeter for the KOTO experiment. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 795, 19-31. https://doi.org/10.1016/j.nima.2015.05.036

Photon-veto counters at the outer edge of the endcap calorimeter for the KOTO experiment. / Matsumura, T.; Shinkawa, T.; Yokota, H. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 795, 10.07.2015, p. 19-31.

Research output: Contribution to journal › Article › peer-review

Matsumura, T, Shinkawa, T, Yokota, H, Iwai, E, Komatsubara, TK, Lee, JW, Lim, GY, Ma, J, Masuda, T, Nanjo, H, Nomura, T, Odani, Y, Ri, YD, Shiomi, K, Sugiyama, Y, Suzuki, S, Togawa, M, Wah, Y, Watanabe, H & Yamanaka, T 2015, 'Photon-veto counters at the outer edge of the endcap calorimeter for the KOTO experiment', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 795, pp. 19-31. https://doi.org/10.1016/j.nima.2015.05.036

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title = "Photon-veto counters at the outer edge of the endcap calorimeter for the KOTO experiment",

abstract = "The Outer-Edge Veto (OEV) counter subsystem for extra-photon detection from the backgrounds for the KL0→π0νν¯ decay is located at the outer edge of the endcap CsI calorimeter of the KOTO experiment at J-PARC. The subsystem is composed of 44 counters with different cross-sectional shapes. All counters are made of lead and scintillator plates and read out through wavelength-shifting fibers. In this paper, we discuss the design and performances of the OEV counters under heavy load (~8tons/m2) in vacuum. For 1-MeV energy deposit, the average light yield and time resolution are 20.9 photo-electrons and 1.5 ns, respectively. Although no pronounced peak by minimum-ionizing particles is observed in the energy distributions, an energy calibration method with cosmic rays works well in monitoring the gain stability with an accuracy of a few percent.",

keywords = "Energy calibration, J-PARC, KOTO, Kaon rare decay, Lead-scintillator sandwich, WLS-fiber readout",

author = "T. Matsumura and T. Shinkawa and H. Yokota and E. Iwai and Komatsubara, {T. K.} and Lee, {J. W.} and Lim, {G. Y.} and J. Ma and T. Masuda and H. Nanjo and T. Nomura and Y. Odani and Ri, {Y. D.} and K. Shiomi and Y. Sugiyama and S. Suzuki and M. Togawa and Y. Wah and H. Watanabe and T. Yamanaka",

note = "Funding Information: We gratefully acknowledge the support of the staff at J-PARC for providing excellent experimental conditions. The authors would also like to express their gratitude to Atsushi Takashima (NDA) and Masayuki Goto (G-Tech Inc.) for their continuous support on technical issues during the design and fabrication of the OEV counters. Part of this work was financially supported by MEXT KAKENHI Grant number 18071006. Publisher Copyright: {\textcopyright} 2015 Elsevier B.V. All rights reserved.",

year = "2015",

month = jul,

day = "10",

doi = "10.1016/j.nima.2015.05.036",

language = "English",

volume = "795",

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T1 - Photon-veto counters at the outer edge of the endcap calorimeter for the KOTO experiment

AU - Matsumura, T.

AU - Shinkawa, T.

AU - Yokota, H.

AU - Iwai, E.

AU - Komatsubara, T. K.

AU - Lee, J. W.

AU - Lim, G. Y.

AU - Ma, J.

AU - Masuda, T.

AU - Nanjo, H.

AU - Nomura, T.

AU - Odani, Y.

AU - Ri, Y. D.

AU - Shiomi, K.

AU - Sugiyama, Y.

AU - Suzuki, S.

AU - Togawa, M.

AU - Wah, Y.

AU - Watanabe, H.

AU - Yamanaka, T.

N1 - Funding Information: We gratefully acknowledge the support of the staff at J-PARC for providing excellent experimental conditions. The authors would also like to express their gratitude to Atsushi Takashima (NDA) and Masayuki Goto (G-Tech Inc.) for their continuous support on technical issues during the design and fabrication of the OEV counters. Part of this work was financially supported by MEXT KAKENHI Grant number 18071006. Publisher Copyright: © 2015 Elsevier B.V. All rights reserved.

PY - 2015/7/10

Y1 - 2015/7/10

N2 - The Outer-Edge Veto (OEV) counter subsystem for extra-photon detection from the backgrounds for the KL0→π0νν¯ decay is located at the outer edge of the endcap CsI calorimeter of the KOTO experiment at J-PARC. The subsystem is composed of 44 counters with different cross-sectional shapes. All counters are made of lead and scintillator plates and read out through wavelength-shifting fibers. In this paper, we discuss the design and performances of the OEV counters under heavy load (~8tons/m2) in vacuum. For 1-MeV energy deposit, the average light yield and time resolution are 20.9 photo-electrons and 1.5 ns, respectively. Although no pronounced peak by minimum-ionizing particles is observed in the energy distributions, an energy calibration method with cosmic rays works well in monitoring the gain stability with an accuracy of a few percent.

AB - The Outer-Edge Veto (OEV) counter subsystem for extra-photon detection from the backgrounds for the KL0→π0νν¯ decay is located at the outer edge of the endcap CsI calorimeter of the KOTO experiment at J-PARC. The subsystem is composed of 44 counters with different cross-sectional shapes. All counters are made of lead and scintillator plates and read out through wavelength-shifting fibers. In this paper, we discuss the design and performances of the OEV counters under heavy load (~8tons/m2) in vacuum. For 1-MeV energy deposit, the average light yield and time resolution are 20.9 photo-electrons and 1.5 ns, respectively. Although no pronounced peak by minimum-ionizing particles is observed in the energy distributions, an energy calibration method with cosmic rays works well in monitoring the gain stability with an accuracy of a few percent.

KW - Energy calibration

KW - J-PARC

KW - KOTO

KW - Kaon rare decay

KW - Lead-scintillator sandwich

KW - WLS-fiber readout

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DO - 10.1016/j.nima.2015.05.036

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JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ER -

Photon-veto counters at the outer edge of the endcap calorimeter for the KOTO experiment

Abstract

Keywords

ASJC Scopus subject areas

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