Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 7: Poster I
A 7.7: Poster
Montag, 14. März 2011, 16:00–18:30, P1
Construction of a Compact 3He Polarizing Facility for Local Usage — •Christian Mrozik, Oliver Endner, Christopher Hauke, Werner Heil, Sergei Karpuk, Jan Klemmer, and Ernst Otten — Johannes Gutenberg-Universität Mainz
Since a decade hyperpolarized 3He, used in fundamental research as well as in medical imaging, 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. At these parameters the process requires the magnetic field to have 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. 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. Compared to the currently used facility, a neat linear motor replaces the cumbersome hydraulical drive of the piston, which compresses the gas without polarization-losses from 1 mbar up to 5 bar. The design of the compact apparatus aims to reach a flux of hyperpolarized 3He at P>65% of several standard liters per hour.