Authors
P K Ghoshal, B Eng, I Gildea, S Gopinath, M P Dion, B U Don, J Mammei, R Rajput-Ghoshal, K Paschke, F Burini
Published in
The Review of scientific instruments. Volume 97. Issue 11. Nov 01, 2026.
Abstract
The Thomas Jefferson National Accelerator Facility has developed a specialized spectrometer system for the MOLLER (Measurement Of a Lepton Lepton Electroweak Reaction) experiment, which is designed to probe weak interactions between electrons using 12 GeV electron LINAC. Scheduled to operate over a three-year period, the experiment relies on five water-cooled toroidal magnets-each with seven-fold symmetry and unique geometry-engineered to focus scattered particles. These magnets generate the magnetic field necessary to separate Moller-scattered electrons from elastically scattered protons within the liquid hydrogen target. To meet physics requirements for the experiment, the field in the bore of each magnet must be low enough to not interfere with the scattered protons and generate unwanted backgrounds downstream. This paper presents an engineering-focused evaluation of the magnetic field mapping process, comparing the measured fields with the design specifications and the simulated fields in the bore. The resulting field maps are intended for use in GEANT4 simulations, where precision is critical due to the challenges of low-field measurements. The field analysis will quantify the differences between the ideal and measured magnetic fields. The final field-mapping data will then be used to verify how well the original engineering assumptions performed in generating field inputs for "ee and ep" tracking simulations.
PMID:
43002106
Bibliographic data and abstract were imported from PubMed on 09 Nov 2026.
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