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Title: Practical in-situ determination of ortho-para hydrogen ratios via fiber-optic based Raman spectroscopy

An experiment was designed and developed to prototype a fiber-optic-based laser system, which measures the ratio of ortho-hydrogen to para-hydrogen in an operating neutron moderator system at the Los Alamos Neutron Science Center (LANSCE) spallation neutron source. Preliminary measurements resulted in an ortho to para ratio of 3.06:1, which is within acceptable agreement with the previously published ratio. As a result, the successful demonstration of Raman Spectroscopy for this measurement is expected to lead to a practical method that can be applied for similar in-situ measurements at operating neutron spallation sources.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-15-25422
Journal ID: ISSN 0168-9002; PII: S016890021501579X
Grant/Contract Number:
AC52-06NA253996
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 810; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ortho-para hydrogen; Raman spectroscopy; fiber-optic; accelerator target; neutron spallation source
OSTI Identifier:
1234428
Alternate Identifier(s):
OSTI ID: 1397581

Sutherland, Liese -Marie, Knudson, James N., Mocko, Michal, and Renneke, Richard M.. Practical in-situ determination of ortho-para hydrogen ratios via fiber-optic based Raman spectroscopy. United States: N. p., Web. doi:10.1016/j.nima.2015.12.009.
Sutherland, Liese -Marie, Knudson, James N., Mocko, Michal, & Renneke, Richard M.. Practical in-situ determination of ortho-para hydrogen ratios via fiber-optic based Raman spectroscopy. United States. doi:10.1016/j.nima.2015.12.009.
Sutherland, Liese -Marie, Knudson, James N., Mocko, Michal, and Renneke, Richard M.. 2015. "Practical in-situ determination of ortho-para hydrogen ratios via fiber-optic based Raman spectroscopy". United States. doi:10.1016/j.nima.2015.12.009. https://www.osti.gov/servlets/purl/1234428.
@article{osti_1234428,
title = {Practical in-situ determination of ortho-para hydrogen ratios via fiber-optic based Raman spectroscopy},
author = {Sutherland, Liese -Marie and Knudson, James N. and Mocko, Michal and Renneke, Richard M.},
abstractNote = {An experiment was designed and developed to prototype a fiber-optic-based laser system, which measures the ratio of ortho-hydrogen to para-hydrogen in an operating neutron moderator system at the Los Alamos Neutron Science Center (LANSCE) spallation neutron source. Preliminary measurements resulted in an ortho to para ratio of 3.06:1, which is within acceptable agreement with the previously published ratio. As a result, the successful demonstration of Raman Spectroscopy for this measurement is expected to lead to a practical method that can be applied for similar in-situ measurements at operating neutron spallation sources.},
doi = {10.1016/j.nima.2015.12.009},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 810,
place = {United States},
year = {2015},
month = {12}
}