Development of a large-area aerogel Cherenkov counter onboard BESS

Y. Asaoka; K. Abe; K. Yoshimura; M. Ishino; M. Fujikawa; S. Orito

doi:10.1016/S0168-9002(98)00772-4

Development of a large-area aerogel Cherenkov counter onboard BESS

Y. Asaoka, K. Abe, K. Yoshimura, M. Ishino, M. Fujikawa, S. Orito^*

^*Corresponding author for this work

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

41 Citations (Scopus)

Abstract

This paper describes the development of a threshold-type aerogel Cherenkov counter with a large sensitive area of 0.6m² to be carried onboard the BESS rigidity spectrometer to detect cosmic-ray antiprotons. The design incorporates a large diffusion box containing 46 finemesh photomultipliers, with special attention being paid to achieving good performance under a magnetic field and providing sufficient endurance while minimizing material usage. The refractive index of the aerogel was chosen to be 1.03. By utilizing the muons and protons accumulated during the cosmic-ray measurements at sea level, a rejection factor of 10⁴ was obtained against muons with β ≈ 1, while keeping 97% efficiency for protons below the threshold.

Original language	English
Pages (from-to)	236-242
Number of pages	7
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	416
Issue number	2-3
DOIs	https://doi.org/10.1016/S0168-9002(98)00772-4
Publication status	Published - 1998 Nov 21
Externally published	Yes

Keywords

Aerogel Cherenkov counter
BESS
Cosmic-ray antiproton
Diffusion box
Finemesh photomultiplier tube
Particle identification

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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10.1016/S0168-9002(98)00772-4

Cite this

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title = "Development of a large-area aerogel Cherenkov counter onboard BESS",

abstract = "This paper describes the development of a threshold-type aerogel Cherenkov counter with a large sensitive area of 0.6m2 to be carried onboard the BESS rigidity spectrometer to detect cosmic-ray antiprotons. The design incorporates a large diffusion box containing 46 finemesh photomultipliers, with special attention being paid to achieving good performance under a magnetic field and providing sufficient endurance while minimizing material usage. The refractive index of the aerogel was chosen to be 1.03. By utilizing the muons and protons accumulated during the cosmic-ray measurements at sea level, a rejection factor of 104 was obtained against muons with β ≈ 1, while keeping 97% efficiency for protons below the threshold.",

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AU - Asaoka, Y.

AU - Abe, K.

AU - Yoshimura, K.

AU - Ishino, M.

AU - Fujikawa, M.

AU - Orito, S.

PY - 1998/11/21

Y1 - 1998/11/21

N2 - This paper describes the development of a threshold-type aerogel Cherenkov counter with a large sensitive area of 0.6m2 to be carried onboard the BESS rigidity spectrometer to detect cosmic-ray antiprotons. The design incorporates a large diffusion box containing 46 finemesh photomultipliers, with special attention being paid to achieving good performance under a magnetic field and providing sufficient endurance while minimizing material usage. The refractive index of the aerogel was chosen to be 1.03. By utilizing the muons and protons accumulated during the cosmic-ray measurements at sea level, a rejection factor of 104 was obtained against muons with β ≈ 1, while keeping 97% efficiency for protons below the threshold.

AB - This paper describes the development of a threshold-type aerogel Cherenkov counter with a large sensitive area of 0.6m2 to be carried onboard the BESS rigidity spectrometer to detect cosmic-ray antiprotons. The design incorporates a large diffusion box containing 46 finemesh photomultipliers, with special attention being paid to achieving good performance under a magnetic field and providing sufficient endurance while minimizing material usage. The refractive index of the aerogel was chosen to be 1.03. By utilizing the muons and protons accumulated during the cosmic-ray measurements at sea level, a rejection factor of 104 was obtained against muons with β ≈ 1, while keeping 97% efficiency for protons below the threshold.

KW - Aerogel Cherenkov counter

KW - BESS

KW - Cosmic-ray antiproton

KW - Diffusion box

KW - Finemesh photomultiplier tube

KW - Particle identification

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IS - 2-3

ER -

Development of a large-area aerogel Cherenkov counter onboard BESS

Abstract

Keywords

ASJC Scopus subject areas

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