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HK: Hadronen und Kerne
HK 56: Postersitzung
HK 56.69: Poster
Mittwoch, 18. März 1998, 17:00–19:00, Foyer
A TDC ASIC for the HADES Drift chamber readout — •J. Wüstenfeld1, C. Garabatos1, W. Karig1, C. Müntz1, J. Stroth1, and P. Zumbruch2 — 1Institut für Kernphysik der J.-W.-Goethe Universität Frankfurt am Main — 2Technische Universität Darmstadt
To digitize the drift times of about 26.000 drift cells, an
application specific integrated circuit (ASIC) TDC was designed. It
has a high-speed read-out interface (10 Mwords/s) and uses the
same measurement unit as the TDC2001 and the HERA-B TDC. The advantages of this
ASIC are an on-chip zero suppresion, multi-hit capability and the absence of
any conversion time. The chips are mounted on dedicated motherboards
to perform the digitization of the drift times directly
at the detector. A drawback of this TDC concept is a significant dependence
of the measurement on both the temperature and the supply voltage.
We will present the temperature and supply voltage dependence of
the chip performance, measured in the laboratory with a prototype version of
the readout system and we will discuss possible calibration schemes.
In addition, first tests at a full sized prototype drift chamber have been
carried out and will be reported.