Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Poster: Atomic systems in external fields
A 26.15: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.V
New Compact Magnetically Shielded 3He MEOP Polarizing Facility — •Christian Mrozik, Werner Heil, Sergei Karpuk, and Ernst Otten — Institut für Physik, Johannes Gutenberg-Universität Mainz
Applications of hyperpolarized 3He exist in fundamental research as well as in medical studies. Since a decade 3He is polarized in a central facility, located at the University of Mainz and shipped to the users. The gas is polarized via metastability exchange optical pumping (MEOP) at a pressure of approximately 1 mbar inside a magnetic field of 1 mT. The process requires a magnetic field with a relative gradient of Δ B/B<3.8·10−4 cm−1. To construct a compact facility for local gas-polarization it is imperative to create a sufficiently homogeneous magnetic field all over a solenoid’s volume in order to be able to use its complete volume for the MEOP assembly. Our concept of a spacious homogenization of a solenoid’s magnetic field consists of enclosing it into a shielding of soft magnetic material, providing a high magnetic permeability [1]. In addition to the homogenization of the magnetic field a new concept for the optics, used for the optical pumping has been developed, to fit into the new compact facility. The design of the compact apparatus aims to reach a flux of hyperpolarized 3He at P>65% of several standard liters per hour. First experimental results, gained from the new compact polarizing apparatus, will be presented.
[1] C. Mrozik et al. Journal of Physics: Conference Series 294 (2011)