A gas analyzer system has been developed to analyze Hydrogen-Deuteride (HD) gas for producing frozen-spin polarized HD targets, which are used for hadron photoproduction experiments at SPring-8. Small amounts of ortho-H2 and para-D2 gas mixtures (∼0.01%) in the purified HD gas are a key to realize a frozen-spin polarized target. In order to obtain reliable concentrations of these gas mixtures in the HD gas, we produced a new gas analyzer system combining two independent measurements with the gas chromatography and the QMS. The para-H2, ortho-H2, HD, and D2 are separated using the retention time of the gas chromatography and the mass/charge. It is found that the new gas analyzer system can measure small concentrations of ∼0.01% for the otho-H2 and D2 with good S/N ratios.
@article{arxiv.1101.5562,
title = {HD gas analysis with Gas Chromatography and Quadrupole Mass Spectrometer},
author = {T. Ohta and S. Bouchigny and J. -P. Didelez and M. Fujiwara and K. Fukuda and H. Kohri and T. Kunimatsu and C. Morisaki and S. Ono and G. Rouille and M. Tanaka and K. Ueda and M. Uraki and M. Utsuro and S. Y. Wang and M. Yosoi},
journal= {arXiv preprint arXiv:1101.5562},
year = {2015}
}