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Fusion Engineering and Design 18 (1991) 397-405 397 North-Holland

Summary: Fusion Engineering and Design 18 (1991) 397-405 397
Direct nuclear heating measurements in fusion neutron
environment and analysis
A. Kumar, M.Z. Youssef, M.A. Abdou
School of Engineering and Applied Science, Uniuersityof California at Los Angeles (UCLA), Los Angeles, CA 90024, USA
Y. Ikeda, C. Konno, K. Kosako, Y. Oyama, T. Nakamura
Department of Reactor Engineering, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11, Japan
Experimental measurement of nuclear heating rates has been carried out in a simulated D-T fusion neutron environment
from 1989 through 1990 under the USDOE/JAERI collaborative program at the Fusion Neutronics Source Facility. The
microcalorimetric technique has been employed for online measurements. Small probes of materials have been irradiated in
close vicinity of a rotating target. A typical probe contains a core measuring 2 cm in diameter by 2 cm in length. Probes of
leading candidates, for different applications, have been investigated: molybdenum, tungsten, titanium, graphite (plasma
facing components), copper (magnet coils), iron, stainless steel 304, nickel (structural material components) and aluminum.
The measured temperature-change rates range from 30 ixK/s (iron) to 330 ixK/s (graphite). The corresponding nuclear
heating rates range from ~ 35 ixW/g (tungsten) to ~ 225 IxW/g (graphite). These measurements have been analyzed using
three dimensional Monte Carlo code MCNP and various heating number/kerma factor libraries. The ratio of computed to
measured heating rates shows large deviation from 1 for all the materials. In addition, there is a large spread for different
libraries; for example, this ratio varies from 1.03 to 1.81 for aluminum. Also, there have been three experiments with each
having a host medium of iron, graphite or copper, that measures 85 mm in diameter by 100 mm in length. Small single


Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles


Collections: Plasma Physics and Fusion