Current status of engineering materials diffractometer at J-PARC

Harjo Stefanus, Ito Takayoshi, Aizawa Kazuya, Arima Hiroshi, Abe Jun, Moriai Atsushi, Iwahashi Takaaki, Kamiyama Takashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

106 Citations (Scopus)


The Engineering Materials Diffractometer "TAKUMI" is designed and has been constructed at Materials & Life Science Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC) to conduct various kinds of studies on materials science and engineering and to promote industrial applications, related with strain measurements. The commissioning of TAKUMI has been started from September 2008, and several user programs have been done. In the commissioning, a resolution Δd/d at high resolution mode (with incident beam collimation) of less than 0.2% was achieved in a diffraction experiment using 2 mm diameter thick annealed piano wire. The d-range measured by TAKUMI with single pulse frame, i.e. standard operation, was confirmed to be 0.05 nm to 0.27 nm, showing that the optimum range for materials research is covered by this machine. TAKUMI adopted an event mode data recording method. It was found that the recording method is very useful to manipulate data as we like, for instance, detector range, time of flight binning width and time resolved data, even after the experiment has been finished.

Original languageEnglish
Title of host publicationResidual Stresses VIII
PublisherTrans Tech Publications Ltd
Number of pages6
ISBN (Print)9783037850855
Publication statusPublished - 2011

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


  • In situ measurement
  • Instrument
  • Neutron diffraction
  • Strain accuracy
  • Time slice measurement

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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