TY - JOUR
T1 - Ultracold neutron storage in a bottle coated with the fluoropolymer CYTOP
AU - Neulinger, Thomas
AU - Beck, Douglas
AU - Connolly, Euan
AU - Degenkolb, Skyler
AU - Fierlinger, Peter
AU - Filter, Hanno
AU - Hingerl, Jürgen
AU - Nordin, Pontus
AU - Saerbeck, Thomas
AU - Zimmer, Oliver
N1 - Publisher Copyright:
© 2022, The Author(s).
PY - 2022/7
Y1 - 2022/7
N2 - The fluoropolymer CYTOP was investigated in order to evaluate its suitability as a coating material for ultracold neutron (UCN) storage vessels. Using neutron reflectometry on CYTOP-coated silicon wafers, its neutron optical potential was measured to be 115.2(2) neV. UCN storage measurements were carried out in a 3.8 l CYTOP-coated aluminum bottle, in which the storage time constant was found to increase from 311(9) s at room temperature to 564(7) s slightly above 10 K. By combining experimental storage data with simulations of the UCN source, the neutron loss factor of CYTOP is estimated to decrease from 1.1(1)× 10 - 4 to 2.7(2)× 10 - 5 at these temperatures, respectively. These results are of particular importance to the next-generation superthermal UCN source SuperSUN, currently under construction at the Institut Laue-Langevin, for which CYTOP is a possible top-surface coating in the UCN production volume.
AB - The fluoropolymer CYTOP was investigated in order to evaluate its suitability as a coating material for ultracold neutron (UCN) storage vessels. Using neutron reflectometry on CYTOP-coated silicon wafers, its neutron optical potential was measured to be 115.2(2) neV. UCN storage measurements were carried out in a 3.8 l CYTOP-coated aluminum bottle, in which the storage time constant was found to increase from 311(9) s at room temperature to 564(7) s slightly above 10 K. By combining experimental storage data with simulations of the UCN source, the neutron loss factor of CYTOP is estimated to decrease from 1.1(1)× 10 - 4 to 2.7(2)× 10 - 5 at these temperatures, respectively. These results are of particular importance to the next-generation superthermal UCN source SuperSUN, currently under construction at the Institut Laue-Langevin, for which CYTOP is a possible top-surface coating in the UCN production volume.
UR - http://www.scopus.com/inward/record.url?scp=85135156661&partnerID=8YFLogxK
U2 - 10.1140/epja/s10050-022-00791-x
DO - 10.1140/epja/s10050-022-00791-x
M3 - Article
AN - SCOPUS:85135156661
SN - 1434-6001
VL - 58
JO - European Physical Journal A
JF - European Physical Journal A
IS - 7
M1 - 141
ER -