Berlin 2005 – scientific programme

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T: Teilchenphysik

T 701: Kosmische Strahlung XI

T 701.6: Talk

Wednesday, March 9, 2005, 15:20–15:35, TU H105

Search for axions with the CCD-detector at CAST(CERN AXION SOLAR TELESCOPE) — •Donghwa Kang, H. Fischer, J. Franz, F.H. Heinsius, and K. Königsmann — Physikalisches Institut, Universität Freiburg

The CAST experiment at CERN searches for solar axions with energies in the keV range. The axions can be converted to photons in the 9 Tesla LHC prototype superconducting magnet. At the end of a 10 m long dipole magnet, three detectors of different kind were installed, which are sensitive in the energy range up to 10 keV. The magnet is moving ± 8 ^∘ vertically and ± 40 ^∘ horizontally to follow the sun. The data presented here were taken with a Charge-Coupled-Device system located in the focus of an X-ray mirror telescope. The CCD detector is operated at low temperature and has a good quantum efficiency. In this talk the first results from the analysis of the 2003 data will be presented, reducing the upper limit of the axion-photon coupling constant by a factor 5 compared to previous axion search experiments. The project is supported by BMBF.