MDT Readout Overview
The ATLAS MDT Chambers are read out using a heirarchy of custom electronics.
Here is where you can find information on each portion of the readout system.
Updated 21 December 2000 firstname.lastname@example.org
Overview of readout [GIF][PS]
The MDT chambers have electronics connected at both ends.
High Voltage is distributed at one end, while the signal readout occurs
at the other end. Each chamber has an associated "Chamber Service Module"
which provides the interface between the chamber and the ATLAS DAQ system.
HV Hedgehog Board (A. Lanza
at INFN Pavia)
HV Patch Panel
(also by A.Lanza)
Each end of the chamber is completely enclosed
by an aluminum shield. Inside the "Faraday Cage" formed by this shield
are the front-end readout boards.
Board Stack Drawings
Barrel Chamber Board Stack [GIF]
Signal Hedgehog Board
HERE for 3-layer version. (see E.Spiriti for 4-layer version)
Octal Amp, Shaper, Discriminator developed by Harvard, Boston U
See Development Info
is a joint development of CERN and KEK
see specification in papers
provides JTAG control of ASD and TDC parameters
Signal Patch Panel
Service Module (CSM)
TTC Receiver and Clock Distribution
JTAG Control Interface
Data is transmitted over ~100m optical fibers to the USA-15 underground
area. There it is received by ROD (ReadOut Driver) modules, which
transmit the data over ROL (ReadOut Link) optical fibers to the counting
house on the surface.
is the proposed ROD for the MDT system.
page or the NIMROD specification in our papers
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