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 journalArticlepeer-review

41 Citations (Scopus)


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 languageEnglish
Pages (from-to)236-242
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2-3
Publication statusPublished - 1998 Nov 21
Externally publishedYes


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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


Dive into the research topics of 'Development of a large-area aerogel Cherenkov counter onboard BESS'. Together they form a unique fingerprint.

Cite this