Kavli Affiliate: T. Higuchi
| First 5 Authors: Jeffery W. Martin, B. Algohi, D. Anthony, L. Barrón-Palos, M. Bradley
| Summary:
The TUCAN (TRIUMF UltraCold Advanced Neutron) Collaboration is completing a
new ultracold neutron (UCN) source. The UCN source will deliver UCNs to a
neutron electric dipole moment (EDM) experiment. The EDM experiment is
projected to be capable of an uncertainty of $1times 10^{-27}~e$cm,
competitive with other planned projects, and a factor of ten more precise than
the present world’s best. The TUCAN source is based on a UCN production volume
of superfluid helium (He-II), held at 1~K, and coupled to a proton-driven
spallation target. The production rate in the source is expected to be in
excess of $10^7$~UCN/s; since UCN losses can be small in superfluid helium,
this should allow us to build up a large number of UCNs. The spallation-driven
superfluid helium technology is the principal aspect making the TUCAN project
unique. The superfluid production volume was recently cooled, for the first
time, and successfully filled with superfluid helium. The design principles of
the UCN source are described, along with some of the challenging cryogenic
milestones that were recently passed.
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