Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Instrumentation und Anwendungen

HK 44.4: Vortrag

Donnerstag, 15. März 2007, 12:00–12:15, E

The Polarized Internal gas Target at ANKE: a first double polarized experiment — •Kirill Grigoryev for the ANKE collaboration — Petersburg Nuclear Physic Institute, Gatchina, Russia — Institut für Kernphysik, Forschungszentrum Jülich, Germany

A Polarized Internal gas Target (PIT) is currently being developed for the ANKE spectrometer at COSY. After first installation in summer 2005, commissioning studies were carried out.

In March 2006, first single polarization measurements with a polarized Hydrogen beam from an Atomic Beam Source (ABS) were performed. The beam was injected into a storage cell made from pure aluminum foil. Further analysis shows that the events from the extended gas target can be clearly identified in the ANKE forward detector system. Using unpolarized Nitrogen, the background from the cell walls could be determined as well. The measured storage cell target thickness with Hydrogen atoms in hyperfine state 1 was 2·10¹³ atoms/cm². The ABS jet target thickness was (1.5±0.1)·10¹¹ atoms/cm².

In November 2006, the commissioning of a Silicon Tracking Telescope (STT) was successfully finished. For a coming beamtime in January 2007, a new storage cell from an aluminum foil coated with a Teflon will be produced and installed together with the STT into the target chamber. A Lamb-shift Polarimeter (LSP) will be mounted below the target chamber to allow online tuning of the transition units and the ABS beam polarization monitoring. A first double polarized experiment will take place and its results will be presented.