Astroparticle Observation Laboratory

T. Tamura

T. Tamura

Tadahisa Tamura

Office: 6-302 Ext.: 3341


03/1993, Ph.D., The University of Tokyo

03/1990, M.S., The University of Tokyo

Research Field

Radiation Detection, Astroparticle Physics.

Research Overview

Studying high-energy phenomena by observing cosmic rays and gamma rays.

Research Subjects

  • 1. Development of the CALorimetric Electron Telescope (CALET) to observe cosmic rays on the International Space Station.
  • 2. Research and development of particle detectors with high-energy particle accelerators.
  • 3. Study of the interaction of high-energy particles with the LHC accelerator in CERN.


High-energy phenomena, such as supernova explosions and black holes, occur in the universe. In such environments, electrons and protons are accelerated to high energies close to the speed of light. These particles are called cosmic rays and can be observed from Earth. I am developing detectors to measure radiation and particles from balloons or the International Space Station.
In balloon experiments, payloads of about 300 kg are launched to altitudes of around 40 km, where the atmospheric pressure is reduced to a few hectopascals. Cosmic rays can be observed in such a low-pressure environment before they are attenuated by the atmosphere. To observe cosmic-ray electrons, our collaborative group carried out several balloon observations in Japan and also performed a long duration balloon observation for 2 weeks in Antarctica.
The results from these balloon experiments led to a project to observe cosmic rays from the International Space Station. I am involved in the Japan Aerospace Exploration Agency project to develop CALET. From the beginning of development, detector structure designs, development of front-end electronics and data taking system, simulations to optimize detector capabilities, and tests to evaluate the performance of instruments must be considered. New methods to derive scientific results from the data are also very important for data analyses. Our analysis techniques for radiation and particle measurements can be applied to measurements of environmental radiation and medical instruments, such as positron emission tomography.

  • 1 “LHCf detector performance during the 2009-2010 LHC run,” International Journal of Modern Physics A, vol. 28(25), pp. 1330036 (2013).
  • 2)“Measurement of forward neutral pion transverse momentum spectra for √s = 7 TeV proton-proton collisions at the LHC,” Physical Review D, vol. 86, pp. 092001 (2012). 3) “Calorimetric Electron Telescope (CALET) to observe cosmic-ray electrons and gamma-rays on the International Space Station,” Nuclear Instruments and Methods in Physics Research A, vol. 623, pp. 428-430 (2010).
Affiliated Academic Organizations

The Physical Society of Japan, The Astronomical Society of Japan.

Current members
◯ Professors: 1 ◯ Undergraduates: 5

Facilities:Wire bonder.