Performances of photodiode detectors for top and bottom counting detectors of ISS-CREAM experiment

H. J. Hyun, T. Anderson, D. Angelaszek, S. J. Baek, M. Copley, S. Coutu, J. H. Han, H. G. Huh, Y. S. Hwang, S. Im, H. B. Jeon, D. H. Kah, K. H. Kang, H. J. Kim, K. C. Kim, K. Kwashnak, J. Lee, M. H. Lee, J. T. Link, L. LutzJ. W. Mitchell, S. Nutter, O. Ofoha, H. Park, I. H. Park, J. M. Park, P. Patterson, E. S. Seo, J. Wu, Y. S. Yoon

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Abstract The Cosmic Ray Energetics and Mass (CREAM) experiment at the International Space Station (ISS) aims to elucidate the source and acceleration mechanisms of high-energy cosmic rays by measuring the energy spectra from protons to iron. The instrument is planned for launch in 2015 at the ISS, and it comprises a silicon charge detector, a carbon target, top and bottom counting detectors, a calorimeter, and a boronated scintillator detector. The top and bottom counting detectors are developed for separating the electrons from the protons, and each of them comprises a plastic scintillator and a 20×20 silicon photodiode array. Each photodiode is 2.3 cm×2.3 cm in size and exhibits good electrical characteristics. The leakage current is measured to be less than 20 nA/cm2 at an operating voltage. The signal-to-noise ratio is measured to be better than 70 using commercial electronics, and the radiation hardness is tested using a proton beam. A signal from the photodiode is amplified by VLSI (very-large-scale integration) charge amp/hold circuits, the VA-TA viking chip. Environmental tests are performed using whole assembled photodiode detectors of a flight version. Herein, we present the characteristics of the developed photodiode along with the results of the environmental tests.

Original languageEnglish (US)
Pages (from-to)134-139
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - Jul 1 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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