Design of an in-situ measurement system for ortho and para liquid hydrogen fractions at ESS
| Autor: | H Tatsumoto, D Lyngh, Y Lee, M Hartl, H Sina, P Arnold, Y Beßler, H Kobayashi, Y Sakamoto, T Hasegawa |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | IOP conference series / Materials science and engineering 1240(1), 012117-(2022). doi:10.1088/1757-899X/1240/1/012117 |
| ISSN: | 1757-899X 1757-8981 |
| DOI: | 10.1088/1757-899x/1240/1/012117 |
| Popis: | IOP conference series / Materials science and engineering 1240(1), 012117 - (2022). doi:10.1088/1757-899X/1240/1/012117 The Cryogenic Moderator System (CMS) is equipped with a catalyst to convert hydrogen from the ortho state to the para state, to keep desirably high parahydrogen fractions in the cold moderators, which is required to deliver a high brightness cold neutron beams to the scientific instruments using neutron scattering. An in-situ measurement system for the ortho and para fractions of liquid hydrogen (OPMS) where a Raman spectroscopy will be used is being developed. The required measurement precision is 0.1% to detect an undesirable shift towards a high orthohydrogen fraction caused by neutron scattering driven para-to-ortho back conversion. The dedicated OPMS sampling line has been designed and is placed in a bypass line from and to the CMS to minimize the hydrogen inventory and to make it physically isolated from the CMS if a sapphire window failure happens. Accident analysis for a hydrogen leak due to the sapphire window failure was carried out using an inhouse-developed simulation code, and the required safety relief size has been determined. Published by Institute of Physics, London [u.a.] |
| Databáze: | OpenAIRE |
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