Kavli Affiliate: T. Higuchi
| First 5 Authors: T. Hepworth, T. Hepworth, , ,
| Summary:
We report the construction and commissioning of a new ultracold neutron (UCN)
guide-coating facility at the University of Winnipeg. The facility employs
pulsed laser deposition (PLD) to produce diamond-like carbon (DLC) coatings on
cylindrical UCN guides up to 1 m in length with a 200 mm outer diameter. DLC is
a promising material for UCN transport and storage due to its high Fermi
potential, low neutron absorption, and low depolarization probabilities. First
coating attempts on a full length aluminum UCN guide were successfully coated
with densities of 2.2-2.3 g/cm$^3$, corresponding to Fermi potentials of
198-207 neV as measured by X-ray reflectometry (XRR). Coating thicknesses were
measured to be 90-180 nm with no evidence of delamination. These results
establish the coating facility. Ongoing and future work focuses on improving
the diamond content of films through plasma plume collimation, substrate
biasing, and pre/post treatment methods with the goal of providing high quality
DLC UCN guides for the TUCAN experiment at TRIUMF.
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