PSAS 2012
International Conference on Precision Physics
of Simple Atomic Systems 2012
Eltville, Germany -
Information

Title:	Dr.
Family Name:	Nikiel
First Name:	Anna
Gender:	female
E-Mail:	nikielauni-mainz.de
Affiliation for Badge:	Uni Mainz
Institute:	Institut fur Physik
Address (Street):	Stautingerweg 7
Postal Code, City:	55-122 Mainz
Country:	Germany
Phone:	+49 061313923318
Fax:
Arrival Date:	June 10
Departure Date:	June 15
Excursion with Conference Dinner:	Selected
Payment:	Cash at the conference site
Title:	3He magnetometers for extreme precision measurements of high magnetic field
Abstract:	Ultra-sensitive measurements of high magnetic fields are of great interest for fundamental physics, e.g., measurement of the magnetic moment of the muon, and applied research. Extreme accuracy of measuring and monitoring magnetic fields (up to deltaB/B 10−12) is also needed in Penning trap high resolution mass spectrometry. Our new approach is based on the measurement spin-precession of gaseous, hyperpolarized 3He atoms in an external magnetic field. The Larmor frequency of the sample magnetization is directly proportional to the magnetic flux density B. This frequency can be measured by standard NMR methods, i.e., recording the signal amplitude of the free induction decay (FID) of the precessing spins after a resonant radio-frequency (RF) pulse excitation (Pi/2-spinflip). For the required accuracy ( 10^−12) very long transverse relaxation times (T2*) are needed, which can be achieved in gaseous 3He samples (T2*~ 70s). High SNR (signal to noise ratio) is also necessary for NMR detection therefore the requires high spin polarization of the 3He gas. This is achieved in-situ, directly in the strong magnetic field, using a new, non-standard variant of the Metastability Exchange Optical Pumping (MEOP). Current status and first results of the experiment will be presented.

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