Static and kinetic experiments on accelerator-driven system with 14MeV neutrons in Kyoto university critical assembly

Cheol Ho Pyeon, Morgan Hervault, Tsuyoshi Misawa, Hironobu Unesaki, Tomohiko Iwasaki, Seiji Shiroya

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)


In preparation for connecting a Fixed Field Alternating Gradient (FFAG) accelerator atthe Kyoto University Critical Assembly (KUCA), static and kinetic experimental and numerical analyses of Accelerator-Driven System (ADS) are envisaged. Improvement of source multiplication by the implementation of a neutron guide is expected to affect the characteristics of the ADS core. The effects on reactivity and neutron flux distribution are investigated by measurements of the subcriticality and the reaction rate distributions of indium wire, respectively, using the KUCA core and the current 14MeV pulsed neutron generator. A comparison of the results of static measurements with those of calculations provides an estimation of MCNP-4C3 precision with JENDL-3.3 and ENDF/B-VI.2 for the basic research on ADS with 14 MeV neutrons at KUCA. The neutron guide has proved to be experimentally effective in improving external source when it is extended into the fuel region. Since the reactivity range of the actual ADS operation is expected to be around 3%Δk/k, the validity of both measurements and calculations has been demonstrated up to 6%Δk/k for the current KUCA cores. The prompt neutron decay constant is obtained by the pulsed neutron method, and subcriticality by the area ratio method, using an optical fiber detection system developed at KUCA. The optical fiber detector has been assessed as a promising original tool for the measurements of the subcriticality and prompt neutron decay constant, through ADS kinetic experiments with 14MeV neutrons.

Original languageEnglish
Pages (from-to)1171-1182
Number of pages12
Journaljournal of nuclear science and technology
Issue number11
Publication statusPublished - 2008 Nov
Externally publishedYes


  • 14 MeV pulsed neutrons
  • ADS
  • FFAG accelerator
  • KUCA
  • Neutron decay constant
  • Neutron guide
  • Optical fiber detector
  • Reaction rate
  • Static and kinetic experiments
  • Subcriticality

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


Dive into the research topics of 'Static and kinetic experiments on accelerator-driven system with 14MeV neutrons in Kyoto university critical assembly'. Together they form a unique fingerprint.

Cite this