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Optimization of the Czochralski Growth Process for Calcium TungstateDetector Crystals

Published online by Cambridge University Press:  30 May 2009

E. Pécontal ,
T. Buchert ,
Ph. Di Stefano ,
Y. Copin ,
Ch. Ciemniak ,
C. Coppi ,
A. Erb ,
F. von Feilitzsch ,
A. Gütlein  and
Ch. Isaila
...Show all authors
Ch. Ciemniak
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
C. Coppi
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
A. Erb
Affiliation:
Walther-Meißner-Institut,Walther-Meißner-Straße 8, 85748 Garching, Germany
F. von Feilitzsch
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
A. Gütlein
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
Ch. Isaila
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
J.-C. Lanfranchi
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
S. Pfister
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
W. Potzel
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
S. Roth
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany
W. Westphal
Affiliation:
Technische Universität München, Physik-Department E15, James-Franck-Str., 85748 Garching, Germany Deceased
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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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 36: Dark Energy and Dark Matter: Observations, Experiments and Theories , 2009 , pp. 269 - 270
Copyright
© EAS, EDP Sciences, 2009

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References

Angloher, G., et al., 2005, Astropart. Phys., 23, 325 CrossRef
Angloher, G., et al., 2008 [arXiv:0809.1829v1] [astro-ph]
Kraus, H., et al., 2007, Nuclear Physics B, Proc. Suppl., 173, 168 CrossRef