Speaker
Mr
Hans-Christian Koch
(University of Mainz / University of Fribourg)
Description
The experimental search for a neutron electric dipole moment
(nEDM) at PSI (Switzerland) calls for the precise measurement and control
of the applied magnetic field.
Here, we report on a combined 3He-Cs magnetometer for the absolute measurement of a uT magnetic field.
The measurement principle relies on detecting the free precession frequency of polarized 3He nuclei by a set of 8 optically pumped double-resonance M_x-cesium magnetometers.
A prototype has been built and its performance was investigated in the magnetically shielded BMSR2-room at PTB (Berlin).
We show that the combined magnetometer reaches a precision of better than 10E-7 in a 100s measurement time, its sensitivity for longer measurement periods being limited by the stability of the applied magnetic field.
Author
Mr
Hans-Christian Koch
(University of Mainz / University of Fribourg)
Co-authors
Mr
Allard Schnabel
(PTB, Berlin)
Prof.
Antoine Weis
(University of Fribourg)
Mr
Georg Bison
(PSI)
Mr
Jens Voigt
(PTB, Berlin)
Dr
Malgorzata Kasprzak
(University of Fribourg)
Prof.
Werner Heil
(Institute of Physics)
Dr
Zoran Grujić
(University of Fribourg, Department of Physics)
on behalf of the nEDM collaboration (PSI) -
