Heidelberg 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
SYDM: Symposium Dipole Moments - A Tool to Search for New Physics
SYDM 3: Session 3
SYDM 3.1: Vortrag
Dienstag, 24. März 2015, 17:00–17:15, P/H1
A precision measurement of the proton g-factor — Georg Ludwig Schneider1 and •Nathan Leefer2 for the BASE collaboration — 1Johannes Gutenberg-Universität Mainz, Mainz, Germany — 2Helmholtz Institut-Mainz, Mainz, Germany
The proton g-factor experiment at Mainz recently used a double Penning-trap apparatus to measure the proton g-factor with a fractional accuracy of 3.3×10−9, improving on the previous direct measurement in a trap by nearly three orders of magnitude. We now aim to increase this accuracy further with a number of upgrades to the trap and detection systems. These upgrades include: a better compensated precision trap; a reduction of the residual quadratic magnetic-field inhomogeneity in the precision trap region; the installation of a superconducting, self-shielding coil for improved magnetic field stability; new low-noise amplifiers for particle detection; and a superconducting cyclotron resonator for more efficient resistive cooling of the proton. We have also implemented phase-sensitive detection techniques for faster determination of both the proton spin-state and cyclotron frequency. This talk will briefly review the previous result and discuss the current status of these upgrades.
Ultimately, a measurement with a measurement precision better than 10−10 is feasible, and the same advances developed at our experiment can be used at the companion antiproton BASE experiment currently being operated at CERN. The eventual comparison of proton and anti-proton g-factors will be one of the most stringent direct tests of CPT symmetry for baryons.