R&D of a MW-class solid-target for a spallation neutron source

Masayoshi Kawai, Michihiro Furusaka, Kenji Kikuchi, Hiroaki Kurishita, Ryuzo Watanabe, Jing Feng Li, Katsuhisa Sugimoto, Tsutomu Yamamura, Yutaka Hiraoka, Katsunori Abe, Akira Hasegawa, Masatoshi Yoshiie, Hiroyuki Takenaka, Katsuichiro Mishima, Yoshiaki Kiyanagi, Tetsuo Tanabe, Naoaki Yoshida, Tadashi Igarashi

Research output: Contribution to journalConference articlepeer-review

31 Citations (Scopus)


R&D for a MW-class solid target composed of tungsten was undertaken to produce a pulsed intense neutron source for a future neutron scattering-facility. In order to solve the corrosion of tungsten, tungsten target blocks were clad with tantalum by means of HIP'ing, brazing and electrolytic coating in a molten salt bath. The applicability of the HIP'ing method was tested through fabricating target blocks for KENS (spallation neutron source at KEK). A further investigation to certify the optimum HIP conditions was made with the small punch test method. The results showed that the optimum temperature was 1500 °C at which the W/Ta interface gave the strongest fracture strength. In the case of the block with a hole for thermocouple, it was found that the fabrication preciseness of a straight hole and a tantalum sheath influenced the results. The development of a tungsten stainless-steel alloy was tried to produce a bare tungsten target, using techniques in powder metallurgy. Corrosion tests for various tungsten alloys were made while varying the water temperature and velocity. The mass loss of tungsten in very slow water at 180 °C was as low as 0.022 mg/y, but increased remarkably with water velocity. Simulation experiments for radiation damage to supplement the STIP-III experiments were made to investigate material hardening by hydrogen and helium, and microstructures irradiated by electrons. Both experiments showed consistent results on the order of the dislocation numbers and irradiation hardness among the different tungsten materials. Thermal-hydraulic designs were made for two types of solid target system of tungsten: slab and rod geometry as a function of the proton beam power. The neutronic performance of a solid target system was compared with that of mercury target based on Monte Carlo calculations by using the MCNP code.

Original languageEnglish
Pages (from-to)38-55
Number of pages18
JournalJournal of Nuclear Materials
Issue numberSUPPL
Publication statusPublished - 2003 May 15
Externally publishedYes
EventFifth international workshop on spallation materials technology - Charleston, United States
Duration: 2002 May 192002 May 24

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering


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