Optimization of the Czochralski Growth Process for Calcium Tungstate Detector Crystals

Issue		EAS Publications Series Volume 36, 2009 Dark Energy and Dark Matter: Observations, Experiments and Theories


Page(s)		269 - 270
DOI		10.1051/eas/0936038
Published online		30 May 2009

Dark Energy and Dark Matter: Observations, Experiments and Theories
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 269-270
DOI: 10.1051/eas/0936038

Optimization of the Czochralski Growth Process for Calcium Tungstate Detector Crystals

Ch. Ciemniak¹, C. Coppi¹, A. Erb², F. von Feilitzsch¹, A. Gütlein¹, Ch. Isaila¹, J.-C. Lanfranchi¹, S. Pfister¹, W. Potzel¹, S. Roth¹ and W. Westphal^{1, 3}

¹ Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
² Walther-Meißner-Institut,Walther-Meißner-Straße 8, 85748 Garching, Germany
³ Deceased

Published online: 30 May 2009

Abstract
CRESST is an experiment for the direct detection of dark matter (WIMPs) via nuclear recoil measurement. The expected very low event rates and the low energy transfer in the keV range demand low background rates and extremely sensitive detectors. Thus the need for detector crystals with good optical and phonon properties combined with high radioactive purity arises. To achieve these goals, the control over the raw materials and their processing, in particular the crystal growth, is important. A new Czochralski furnace has been installed at the crystal laboratory of the Physik-Department in Garching to meet the delicate conditions required to grow CaWO₄ crystals of sufficient size.

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