Speaker
Description
SuperSUN is a high-density source of Ultra Cold Neutrons (UCN) that feeds the PanEDM experiment, aiming to measure the neutron's permanent Electric Dipole Moment (EDM). The source delivers an exceptionally low-energy UCN spectrum, which promises long observation times but also requires developing new UCN handling techniques.
SuperSUN is based on conversion of cold neutrons in superfluid 4He, at temperatures below 0.6 K where upscattering loss is strongly suppressed. We report on current performance of the Phase 1 source, where UCN are trapped by the material walls of the conversion volume. We further report on characterization of UCN spectra, extraction, and UCN optics. The upgrade path towards Phase 2 will be outlined, where the UCN trap lifetime and spectral coverage will be extended by introducing an octupole superconducting magnet within the source.
PanEDM is a compact neutron EDM experiment, designed with several particular features to profit from the specific energy spectrum and phase space of UCN from SuperSUN. These include a Magnetically Shielded Room with >10E6 shielding factor at mHz frequencies, a non-conductive vacuum chamber containing a double-cell UCN spectrometer, and ultralow-noise cesium magnetometers. UCN polarization in phase 1 will be generated and analyzed via warm-bore superconducting magnets, eliminating losses from transmissive foil polarizers. We report on design and commissioning of PanEDM phase 1, and briefly comment on the outlook towards phase 2.