Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2003-07-09
Nucl.Instrum.Meth.A508:257-267,2003
Physics
Nuclear Physics
Nuclear Experiment
accepted for publication in NIMA
Scientific paper
10.1016/S0168-9002(03)01666-8
Controlling and measuring the concentration of para-D2 is an essential step toward realizing solid deuterium as an intense ultra-cold neutron (UCN) source. To this end, we implemented an experimental technique to convert para- to ortho-deuterium molecules by flowing D2 gas through a cryogenic cell filled with paramagnetic hydrous ferric oxide granules. This process efficiently reduced the para-D2 concentration from 33.3% to 1.5%. Rotational Raman spectroscopy was applied to measure the residual para-D2 contamination to better than 2 parts in 10^3, and the hydrogen contamination to 1 part in 10^3. We also contrast our optical technique to conventional thermal conductivity measurements of the para-D2 concentration, reporting some of the relevant strengths and weaknesses of our implementation of each technique.
Lamoreaux Steve K.
Liu Chen-Yu
Saunders Arrun
Smith Douglas
Young Albert Raymond
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