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A next-generation inverse-geometry spallation-driven ultracold neutron source | | K.K.H. Leung
; G. Muhrer
; T. Hügle
; T.M. Ito
; E.M. Lutz
; M. Makela
; C.L. Morris
; R.W. Pattie, Jr.
; A. Saunders
; A.R. Young
; | | Date: |
23 May 2019 | | Abstract: | The concept of a next-generation spallation-driven ultracold neutron (UCN)
source capable of delivering an integrated flux of $sim 10^{9},{
m
UCN,s^{-1}}$ is presented. A novel "inverse geometry" design is used with 40
liters of superfluid $^4$He (He-II) as converter cooled with state-of-the-art
sub-cooled cryogenic technology to $sim$1.6 K. Our design is optimized for a
100 W maximum thermal heat load constraint on the He-II and its vessel. We use
a modified Lujan-Center Mark-3 target for UCN production as a benchmark, then
present our baseline inverse geometry source design that gives a total UCN
production rate of $P_{
m UCN} = 2.4 imes 10^{8},{
m s^{-1}}$. In our
geometry, the spallation target is wrapped symmetrically around the He-II
volume and moderators to permit raster scanning the proton beam over a
relatively large volume of tungsten spallation target to reduce the demand on
the cooling requirements, which makes it reasonable to assume water
edge-cooling is sufficient. Our design is refined in several steps to reach
$P_{
m UCN} = 2.1 imes 10^{9},{
m s^{-1}}$ under our other restriction of 1
MW maximum proton beam power. We also study effects of the He-II scattering
kernel used and reductions in $P_{
m UCN}$ due to pressurization to reach
$P_{
m UCN} = 1.8 imes 10^{9},{
m s^{-1}}$. Finally, we estimate the UCN
transport efficiency to show that the total extracted rate out of the source
can be $R_{
m ex} approx 6 imes 10^{8},{
m s^{-1}}$ from a 18 cm diameter
guide. These extracted rates are around an order of magnitude higher than the
strongest proposed sources so far, and is around three orders of magnitude
higher than existing sources. | | Source: | arXiv, 1905.9459 | | Services: | Forum | Review | PDF | Favorites | |
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