Experimental and theoretical study of cold neutron sources of liquid hydrogen and liquid deuterium

Using CFD as Preventative Maintenance Tool for the Cold Neutron Source Thermosiphon System

“…The purpose of these experiments was to determine the optimal CNS design that was to be installed in the FrenchGerman High Flux Reactor (HFR) at ILL at the time. Ageron et al [6] surmised this work in an English publication which concluded that the liquid deuterium source gave the best overall performance with the highest flux and gain factor at wavelengths greater than 8Å. This finding was repeated 2 Science and Technology of Nuclear Installations by Egelstaff [7] who examined many CNS benchmarking studies and concluded that deuterium, in a sufficiently large volume, was the best moderator for cold neutrons.…”

Experimental characterization of the Advanced Liquid Hydrogen Cold Neutron Source spectrum of the NBSR reactor at the NIST Center for Neutron Research

“…Capture gamma radiation from the cadmium was greatly reduced by pre-masking the Cd entrance slit with a greater-than-beam-sized, 2 mm thick sheet of lithiated polymer (PNPI Lithoflex with N( 6 Li)E3 Â 10 22 cm À 3 ) containing a slightly oversized slit in such a way that the majority of stray neutron beam is captured in 6 Li (see Fig. 3).…”

“…After Butterworth et al built the first cold neutron device in a nuclear reactor (BEPO at Harwell, UK) in 1957 [1,2] cold neutron sources were incorporated into the design of both nuclear reactor-based, steady-state neutron sources (including the use of liquid hydrogen isotopes) [3,4] and of pulsed neutron sources [5]. High brightness (neutron flux per unit solid angle) cold neutron sources using liquid deuterium were very successfully implemented at the Institut Laue-Langevin in the 1970s and 1980s [6,7], with similar concepts at the FRM-II, Technische Universität München, Garching, Germany [8] and the Opal Reactor in Australia [9]. More compact cold sources, using liquid hydrogen, have been successfully operated at the Orphée reactor, France, the HFIR reactor at Oak Ridge National Laboratory, USA, and here at the NIST Center for Neutron Research (NCNR).…”

How the Minuscule Can Contribute to the Big Picture: The Neutron Electric Dipole Moment Project at TRIUMF

“…Scheduled for 2019, the heavy water cryostat will be replaced by a liquid deuterium (LD2) volume that surrounds the UCN production volume and creates a large flux of cold neutrons. LD2 has been proven one of the best cold neutron moderators at various facilities [32,33,34,35,36]. In the TRIUMF geometry compared to the heavy water, the UCN yield in the superfluid helium is expected to be more than a factor of five higher using LD2.…”