Cryogenic magnetic coil and superconducting magnetic shield for neutron electric dipole moment searches

A magnetic coil operated at cryogenic temperatures is used to produce spatial, relative field gradients below 6ppm/cm, stable for several hours. The apparatus is a prototype of the magnetic components for a neutron electric dipole moment (nEDM) search, which will take place at the Spallation Neutron...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2017-08, Vol.862, p.36-48
Main Authors: Slutsky, S., Swank, C.M., Biswas, A., Carr, R., Escribano, J., Filippone, B.W., Griffith, W.C., Mendenhall, M., Nouri, N., Osthelder, C., Pérez Galván, A., Picker, R., Plaster, B.
Format: Article
Language:English
Subjects:
Cryogenic
Electric dipole moment
Geometric phase
Magnetic fields
Magnetic gradients
Superconducting
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Summary:A magnetic coil operated at cryogenic temperatures is used to produce spatial, relative field gradients below 6ppm/cm, stable for several hours. The apparatus is a prototype of the magnetic components for a neutron electric dipole moment (nEDM) search, which will take place at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory using ultra-cold neutrons (UCN). That search requires a uniform magnetic field to mitigate systematic effects and obtain long polarization lifetimes for neutron spin precession measurements. This paper details upgrades to a previously described apparatus [1], particularly the introduction of super-conducting magnetic shielding and the associated cryogenic apparatus. The magnetic gradients observed are sufficiently low for the nEDM search at SNS.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2017.05.005