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Thermal analysis, design, and testing of a rotating beam target for a compact D-D fast neutron generator

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Kromer Heiko, Adams Robert, Soubelet Benoit, Zboray Robert, Prasser Horst-Michael,
Project Optimization of a compact fast-neutron generator for imaging purposes
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Original article (peer-reviewed)

Journal Applied Radiation and Isotopes
Volume (Issue) 145
Page(s) 47 - 54
Title of proceedings Applied Radiation and Isotopes
DOI 10.1016/j.apradiso.2018.12.009

Abstract

Compact Deuterium-Deuterium fast neutron generators are generally limited to a low neutron yield due to outgassing of implanted deuterium in case of ion beam target overheating. This is even more pronounced for a generator with a small emitting spot tailored to transmission-based imaging applications, resulting in long exposure times. In this work a novel water-cooled rotating copper target rod with a 5 μm thin titanium coating as a deuteron beam target was developed. Using extensive computational fluid dynamics and heat transfer analysis, an optimized target configuration was chosen. The details of the target rod design, construction and loading with deuterium are outlined. The first results after loading showed a peak total neutron output of 4.8×107 n/s for −107 kV target high voltage and 0.9 mA average target current at 220 rpm target rotational velocity. The comparison between actual and theoretical ideal neutron yield suggested that no loss of deuterium density in the target due to outgassing occurred.
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