Abstract
In a new experimental search for an electric dipole moment (EDM) of the neutron, polarized 3 He will occupy the same volume as the neutrons under study to serve as a co-magnetometer, enabling precise corrections for ambient magnetic field drifts that would otherwise severely limit the reach of the experiment. One of the two methods that will be built into the apparatus is to directly detect the 3 He magnetization signal using superconducting quantum interference device (SQUID)-based gradiometers. In a previous work in this Transactions, we proposed a candidate design for a SQUID system consistent with experimental requirements and the planned neutron EDM apparatus. Because the 3 He precession signal is at approximately 100 Hz, signal contamination from low-frequency magnetic noise could adversely affect the co-magnetometer readout precision; the addition of reference magnetometer channels to the SQUID system could mitigate this risk. In this paper, we present noise studies of the candidate SQUID system in a test apparatus and demonstrate effective ambient magnetic field noise cancelation with the implementation of reference channels. In addition, we report a demonstration of low-noise SQUID operation while a nearby photomultiplier tube and its high-voltage power supply are operating.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.