Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session D14: Mini-Symposium:The Neutron Lifetime Anomaly - future directions
3:30 PM–5:06 PM,
Saturday, April 13, 2019
Sheraton
Room: Plaza Court 3
Sponsoring
Unit:
DNP
Chair: Geoff Greene, University of Tennessee
Abstract: D14.00004 : Ideas for a Superconducting Second-Generation Magneto-Gravitational Trap for Measurement of the Neutron Lifetime
4:30 PM–4:42 PM
Presenter:
Peter Lowell Walstrom
(Los Alamos National Laboratory)
Author:
Peter Lowell Walstrom
(Los Alamos National Laboratory)
Ideas are presented for a second-generation UCN trap (UCNtau2) with the same basic geometry as the existing UCNtau trap at LANL, but with a trapping field produced by an array of side-by-side superconducting "banana" coils in place of the permanent magnets of UCNtau. The coils employ NbTi/Cu superconducting cables and operate at a current that is less than 50% of the critical current at the peak field in the windings. The effective trapping field of UCNtau is ~0.8 T and the trap depth approximately 0.47 m. If the trapping field were to be increased, for example, to 2 T, the trap depth could be increased to 1.2 m and simple scaling of the present trap geometry would give a trap volume of 15 times the present volume, or about 6.3 m3. The simplest filling scheme is to fill the trap with the trapping field off, containing the neutrons with a material liner, and then to ramp the current to the design value, after which the UCNs are contained by the trapping field. Alternative filling schemes that do not require coil ramping are also under consideration and will be described in other talks.
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