MuSEUM experiment is in progress at J-PARC to measure the muonium hyperfine structure with a sensitivity as low as a few ppb. Muon g-2/EDM experiment is also planned in J-PARC to measure muon’s anomalous magnetic moment and electric dipole moment with an accuracy below 0.1 ppm. Both experiments require high homogeneous magnetic field below 0.2 ppm pp(peak-to-peak). Commercial MRI magnets...
Experiments of g-2/EDM precise measurements are under preparation in J-PARC and they use a high field (3.0 T) muon beam storage magnet (MBSM) with a cylindrical fiducial volume with 3cm-radial width, 10cm-vertical (axial) height and 66.6 cm diameter with less than 0.2 ppm peak-to-peak magnetic field homogeneity. Muons will be injected through the spiral injection from the magnet top through...
MuSEUM experiment to measure the muonium hyperfine structure at 1.7 T, is planned at J-PARC. The objective is to measure hyperfine transitions in the ground state hyperfine structure interval of Muonium precisely. The essential parameter is the magnetic field homogeneity, which is required to be less than 0.2 ppm pp(peak-to-peak) within a spheroid region with an equational radius of 100 mm and...
In MuSEUM experiment at J-PARC, we are working on precise measurements of the muon hyperfine structure in the ground state. We are currently developing a device for experiments in a high magnetic field (1.7 T) in order to achieve higher precision than the previous experiments. For high-precision measurement of muon hyperfine structure, it is essential to improve the magnetic field accuracy in...
The ITER outer vessel steady-state magnetic field sensors (OVSS) have been calibrated at Argonne National Laboratory’s 4 Tesla Magnet Facility, using a fixture and process developed by Fermilab. The OVSS consists of two bismuth Hall probe sensing layers and onboard thermocouple, designed to operate with a measurement error of 4 mT for the magnetic field up to 2.5 T at the OVSS location. To...
