A New Cryogenic Apparatus to Search for the Neutron Electric Dipole Moment

Abstract

A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with a major improvement in sensitivity compared to the existing limit in the search for a neutron Electric Dipole Moment (EDM). It uses superfluid ${}^4$He to produce a high density of Ultra-Cold Neutrons (UCN) which are contained in a suitably coated pair of measurement cells. The experiment, to be operated at the Spallation Neutron Source at Oak Ridge National Laboratory, uses polarized ${}^3$He from an Atomic Beam Source injected into the superfluid ${}^4$He and transported to the measurement cells as a co-magnetometer. The superfluid ${}^4$He is also used as an insulating medium allowing significantly higher electric fields, compared to previous experiments, to be maintained across the measurement cells. These features provide an ultimate statistical uncertainty for the EDM of $2-3\times 10^{-28}$ e-cm, with anticipated systematic uncertainties below this level.

References in corpus (27)

• A Revised Experimental Upper Limit on the Electric Dipole Moment of the Neutron
• Electric Dipole Moments of the Atoms, Molecules, Nuclei and Particles
• Reduced Limit on the Permanent Electric Dipole Moment of ${}^{199}$Hg
• Characterization of Three High Efficiency and Blue Sensitive Silicon Photomultipliers
• A magnetically shielded room with ultra low residual field and gradient
• A large-scale magnetic shield with 10^6 damping at mHz frequencies
• Performance of the upgraded ultracold neutron source at Los Alamos National Laboratory and its implication for a possible neutron electric dipole moment experiment
• Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute
• Detailed Discussion of a linear electric field frequency shift induced in confined gases by a magnetic field gradient: Implications for neutron electric dipole moment experiments
• Apparatus for Measurement of the Electric Dipole Moment of the Neutron using a Cohabiting Atomic-Mercury Magnetometer
• Fundamental Neutron Physics Beamline at the Spallation Neutron Source at ORNL
• Magnetic trapping of ultracold neutrons
• Magnetic field uniformity in neutron electric dipole moment experiments
• Effect of an electric field on superfluid helium scintillation produced by alpha-particle sources
• Measurement of the 3He mass diffusion coefficient in superfluid 4He over the 0.45-0.95 K temperature range
• Atomic electric dipole moments of He and Yb induced by nuclear Schiff moments
• Frequency shifts and relaxation rates for spin 1/2 particles moving in electromagnetic fields
• Scintillation of Liquid Helium for Low-Energy Nuclear Recoils
• Dipole-Field Contributions to Geometric-Phase-Induced False Electric-Dipole Moment Signals for Particles in Traps
• Large Plastic Scintillator Panels with WLS Fiber Readout; Optimization of Components
• Random walks with thermalizing collisions in bounded regions; physical applications valid from the ballistic to diffusive regimes
• Cryogenic magnetic coil and superconducting magnetic shield for neutron electric dipole moment searches
• Spin Dressed Relaxation and Frequency Shifts from Field Imperfections
• Development of a SQUID-based 3He Co-magnetometer Readout for a Neutron Electric Dipole Moment Experiment
• A prototype vector magnetic field monitoring system for a neutron electric dipole moment experiment
• Transport in ultradilute solutions of ${}^3$He in superfluid ${}^4$He
• Transport in very dilute solutions of ${}^3$He in superfluid ${}^4$He

Cited by in corpus (24)

• The design of the n2EDM experiment
• Particle Physics at the European Spallation Source
• Two-Higgs-Doublet Model with Soft CP-violation Confronting Electric Dipole Moments and Colliders
• High Quality QCD Axion at Gravitational Wave Observatories
• Cornering Spontaneous CP Violation with Charged-Higgs Searches
• Scintillation yield from electronic and nuclear recoils in superfluid ${}^4$He
• Ultracold neutron storage and transport at the PSI UCN source
• Effect of an electric field on liquid helium scintillation produced by fast electrons
• A study of DC electrical breakdown in liquid helium through analysis of the empirical breakdown field distributions
• One-loop matching of the $CP$-odd three-gluon operator to the gradient flow
• The HIBEAM Instrument at the European Spallation Source
• The physical meaning of the magnetic scalar potential, and how to use it to design an electromagnet
• A search for neutron to mirror neutron oscillation using neutron electric dipole moment measurements
• Imperfect Axion Precludes the Domain Wall Problem
• Is the $\bar{\theta }$ parameter of QCD constant?
• ALP contribution to the Strong CP problem
• Electric Dipole Moments as Probes of $B$ Anomaly
• A practical approach to calculating magnetic Johnson noise for precision measurements
• Multiplexable frequency retuning of MKID arrays using their non-linear kinetic inductance
• On the Quantum Uncertainty of the Neutron Electric Dipole Moment
• Simulations of the nEDM@SNS light collection system efficiency
• Quantum Control of Two Critically Dressed Spin 1/2 Species in Magnetic Fluctuations
• A Novel Silicon Photomultiplier Readout Architecture for Low-light Applications
• Optimizing Spin Dressing Sensitivity for the nEDMSF Experiment