CERN AXION SOLAR TELESCOPE Statusreport to SPSC Representing the CAST collaboration: Dieter H.H. Hoffmann TU-Darmstadt & GSI- Darmstadt Geneve 06.07.2004.

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CERN AXION SOLAR TELESCOPE Statusreport to SPSC Representing the CAST collaboration: Dieter H.H. Hoffmann TU-Darmstadt & GSI- Darmstadt Geneve

(1) Croatia, Zagreb Ruder Boskovic Institute M. KRCMAR, A. LJUBICIC, B. LAKIC (2) France, Gif-Sur-Yvette Centre d'Etudes de Saclay (CEA-Saclay), DAPNIA S. ANDRIAMONJE, St. AUNE, A. DELBART, E. FERRER RIBAS, I. GIOMATARIS, I.G. IRASTORZA, (3) Germany, Darmstadt Technische Universitat Darmstadt, Institut für Kernphysik T. DAFNI, D. HOFFMANN, M. Kanapathipillai, M. MUTTERER, H. RIEGE, Y. SEMERTZIDIS (4) Germany, Frankfurt Applied Physics V. ARSOV, J. JACOBY (5) Germany, Freiburg Albert-Ludwigs-Universität Freiburg H. FISCHER, J. FRANZ, F.-H. HEINSIUS, D. KANG, K. KÖNIGSMANN (6) Germany, Garching Max-Planck-Gesellschaft (MPG), Max-Planck-Institut für Extraterrestrische Physik H. BRÄUNINGER, J. ENGLHAUSER, P. Friedrich, R. Hartmann, M. Kuster (7) Germany, Muenchen Max-Planck-Institut für Physik, Werner-Heisenberg- Institut R. KOTTHAUS, G. LUTZ, G. RAFFELT (8) Greece, Athens National Center for Scientific Research "Demokritos" (NRCPS) G. FANOURAKIS, Th. GERALIS, K. Kousouris, K. ZACHARIADOU (9) Geece, Thessaloniki Aristotle University of Thessaloníki Ch. ELEFTHERIADIS, A. LIOLIOS, A. NIKOLAIDIS, I. SAVVIDIS, K. ZIOUTAS (10) Italy, Pisa Scuola Normale Superiore (SNS) L. DiLella (11) Russia, Moskva Russian Academy of Sciences, Institute for Nuclear Research (INR) S. GNINENKO, N. GOLOUBEV (12) Spain, Zaragoza Universidad de Zaragoza, Facultad de Ciencias, Instituto de Física Nuclear y Altas Energías B. BELTRAN, J. CARMONA, S. CEBRIAN, Gl. LUZON, A. MORALES, J. MORALES, A. ORTIZ DE SOLORZANO, J. Ruz, M. SARSA, J. VILLAR (13) Switzerland, Geneve European Organization for Nuclear Research (CERN) K. BARTH, M. DAVENPORT, R. DE OLIVEIRA, M. DIMARCO, F. FORMENTI, A. MCDONALD, Th. PAPAEVANGELOU, A. PLACCI, L. STEWART, B. VULLIERME, L. WALCKIERS (14) United States of America, Chicago, Il University of Chicago, Enrico Fermi Institute J. COLLAR, D. MILLER, J. VIEIRA (15) United States of America, Columbia, Sc University of South Carolina, Department of Physics and Astronomy F. AVIGNONE, R. CRESWICK, H. FARACH The CAST Collaboration

Outline -Solar Axions -CAST : - Status Magnet, sun tracking -Detectors: TPC Micromegas X-ray Telescope and CCD -Outlook

Axions α pseudoscalar neutral practically stable phenomenology driven by the breaking scale f a and the specific axion model Couples to photon L = g ( EB ) a Primakoff (1951) [ ] PRIMAKOFF EFFECT axion-like particles Any scalar or pseudoscalar particles:

Solar axions axions Transverse magnetic field (B) X ray detector AXION PHOTON CONVERSION L COHERENCE 1 Principle of detection

α Stellar interior the Sun!!Solar Axions Flux at the Earth PRIMAKOFF EFFECT [K.van Bibber et al.,1989] Solar Axion Spectrum

Sunset Photon detectors Sunrise Photon detectors Sunset axions Sunrise axions Decomissioned LHC test magnet Rotating platform 3 X-ray detectors X-ray Focusing Device Decomissioned LHC test magnet Rotating platform 3 X-ray detectors X-ray Focusing Device Cern Axion Solar Telescope

L= 10 m, B=9 T 100 times better than previous exp. CAST : Magnet

Grid measurements after magnet loading

Angular encoders

Tracking System : Calibrated and correlated with celestial coordinates Tracking System : Calibrated and correlated with celestial coordinates Twice a year (September&March) we can film the Sun through the window Looking at sunrise Magnet, sun tracking