Speaker
G. unel
(UNIVERSITY OF CALIFORNIA AT IRVINE AND CERN)
Description
The 40 MHz collision rate at the LHC produces ~25 interactions per bunch crossing
within the ATLAS detector, resulting in terabytes of data per second to be handled
by the detector electronics and the trigger and DAQ system. A Level 1 trigger system
based on custom designed and built electronics will reduce the event rate to 100 kHz.
The DAQ system is responsible for the readout of the detector specific electronics
via 1600 point to point links hosted by Readout Subsystems, the collection and
provision of ''Region of Interest data'' to the Level 2 trigger, the building of
events accepted by the Level 2 trigger and their subsequent input to the Event Filter
system where they are subject to further selection criteria. Also the DAQ provides
the functionality for the configuration, control, information exchange and monitoring
of the whole ATLAS detector.
The baseline ATLAS DAQ architecture and its implementation will be introduced. In
this implementation, the configuration, control, information exchange and monitoring
functionalities are provided with CORBA; the
control aspects are handled by an expert system based on CLIPS and the data
connection between 150 Readout Subsystems, up to 500 Level 2 Processing Units and to
80 Event building nodes is done Gigabit Ethernet network technology.
The experience from using the DAQ system in a combined test beam environment where
all ATLAS subdetectors are participating will be presented. The current performances
of some DAQ components as measured in the laboratory environment will be summarized.
Some results from the large scale functionality tests, on a system of a 300 nodes,
aimed at understanding the scalability of the current implementation will also be shown.
Primary authors
G. unel
(UNIVERSITY OF CALIFORNIA AT IRVINE AND CERN)
TDAQ ATLAS
(ATLAS)
