Journal Article

IMPULSE-2019-00105

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A hydrogen leak-tight, transparent cryogenic sample container for ultracold-neutron transmission measurements

Döge, S. (Corresponding author)MLZ* ; Hingerl, J.

2018
American Institute of Physics [S.l.]

Please use a persistent id in citations: doi:10.1063/1.4996296

Abstract: The improvement of the number of extractable ultracold neutrons (UCNs) from converters based on solid deuterium (sD2) crystals requires a good understanding of the UCN transport and how the crystal’s morphology influences its transparency to the UCNs. Measurements of the UCN transmission through cryogenic liquids and solids of interest, such as hydrogen (H2) and deuterium (D2), require sample containers with thin, highly polished and optically transparent windows and a well defined sample thickness. One of the most difficult sealing problems is that of light gases like hydrogen and helium at low temperatures against high vacuum. Here we report on the design of a sample container with two 1 mm thin amorphous silica windows cold-welded to aluminum clamps using indium wire gaskets, in order to form a simple, reusable, and hydrogen-tight cryogenic seal. The container meets the above-mentioned requirements and withstands up to 2 bar hydrogen gas pressure against isolation vacuum in the range of 10−5 to 10−7 mbar at temperatures down to 4.5 K. Additionally, photographs of the crystallization process are shown and discussed.

Keyword(s): Nuclei and Particles (1st) ; Particle Physics (2nd)

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Contributing Institute(s):

1. UCN

Experiment(s):

1. UCN source (SR6)

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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