Summary
This paper documents the design and performance of a novel pulsed proton NMR magnetometer system built at the University of Washington for the FNAL E989 muon g-2 experiment. The magnetometer comprises 378 petroleum jelly-based NMR probes integrated into vacuum chamber walls with custom modular RF electronics, achieving and sustaining the sub-70 ppb magnetic field measurement precision required for the experiment over an 8-year operational period. The work represents a significant instrumentation advance in fundamental physics measurement methodology.
UK applicability
This paper describes fundamental physics instrumentation developed for a United States-based experiment and has no direct applicability to UK agricultural, soil health, or food systems research or policy. It falls outside the scope of Vitagri's Pulse Brain catalogue.
Key measures
Magnetic field precision (ppb), single-shot resolution of NMR probe array (650 ppb median), temporal stability of 1.45 T field over 8 years
Outcomes reported
The study describes the design, construction, and performance of a pulsed proton NMR magnetometer array comprising 378 petroleum jelly-based probes embedded in muon storage ring vacuum chambers. After 8 years of operation, the magnetometer achieved a median single-shot resolution of 650 ppb, meeting the requirement to track temporal stability of the 1.45 T magnetic field to better than 70 ppb.
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