Superconducting UCN Polarizer for a New EDM Spectrometer
A test experiment has shown that the number of ultracold neutrons (UCN) of one polarization state, transmitted through a 100 μm Al foil when placed in a 5 T magnetic field, is greater by 3.8 times. The increased transmission is due to the higher velocity of the UCN passing through the foil.
A compact, large-diameter adiabatic spinflipper for ultracold neutrons
Abstract We report the design and test of a compact, large-diameter spinflipper for ultracold neutrons based on the principle of adiabatic spinflip. A solenoid rf coil with a high diameter-to-length ratio (d/l~1.7) is surrounded by up to three short magnet coils (d/l~0.4…1.7) to provide the static gradient field. The device is optimized for low power consumption and operation in high vacuum. The magnetic field conditions necessary for full spinflipper efficiency over the full diameter were evaluated with ultracold neutrons. The measured spinflipper efficiency vs. adiabaticity correlation is in good agreement with a calculation based on an ideally linear gradient.
Production of ultracold neutrons by the method of rotating flat neutron mirrors
Abstract A mechanical generator has been built for ultracold neutron production by the method of multiple reflections from rotating flat neutron mirrors. Relations were derived which describe the slowing down of neutrons by the proposed system. Using the equations obtained computer calculations were performed in order to choose the parameters and modes of operation. Preliminary experimental results are presented.