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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Struktur und Dynamik von Kernen - Poster

HK 33.7: Poster

Mittwoch, 23. März 2011, 14:00–16:00, Foyer Chemie

Development of a latch-up protection system for the Micro Vertex Detector of CBM — •Michal Koziel¹, Norbert Bialas¹, Christoph Schrader¹, Selim Seddiki², Michael Deveaux¹, Joachim Stroth¹, and Christian Müntz¹ — ¹Institut für Kernphysik, Goethe- Universität, Frankfurt am Main, Germany. — ²Institut Pluridisciplinaire Hubert Curien (IPHC), Strasbourg, France.

The Micro Vertex Detector (MVD) of the CBM experiment will be exposed to a high flux of various charge particles, among them nuclear fragments. The Linear Energy Transfer (LET) of such particles in the CMOS-sensors of the MVD is sufficient to generate latch-up and the latter was indeed seen in a beam tests carried out by the STAR HFT collaboration. This local short circuit is initiated when high, radiation induced charge carrier densities switch parasitic thyristors to the conductive state. The thyristor remains conductive until the power of the IC is cut and hence may cause permanent thermal damage in the device if not handled appropriately in short time.

To protect the sensors of the MVD against such damage, we are developing a system, which detects the over-currents caused by the latch-up and protects affected sensors by means of a fast and controlled power cycle. The concept and implementation of this latch-up protection system will be discussed.

"This work was supported by HIC for FAIR, EU (FP7-WP26), BMBF (06FY9099I) and GSI."