Speaker
Mr
Belmiro Antonio Venda Pinto
(Faculdade de Ciencias - Universidade de Lisboa)
Description
The ATLAS experiment uses a complex trigger strategy to be able to achieve the
necessary Event Filter rate output, making possible to optimize the storage and
processing needs of these data. These needs are described in the ATLAS Computing
Model which embraces Grid concepts. The output coming from the Event Filter will
consist of four main streams: the physical stream, express stream, calibration
stream, and a diagnostic stream. The calibration stream will be transferred to the
Tier-0 facilities which will provide the prompt reconstruction of this stream with a
minimum latency of 8 hours, producing calibration constants of sufficient quality to
permit a first-pass processing. The
Inner Detector community is developing and testing an independent common calibration
stream selected at the Event Filter after track reconstruction. It is composed of raw
data, in byte-stream format, contained in ROB's with hit information of the selected
tracks, and it will be used to derive and update a set of calibration and alignment
constants after every fill. This option was selected because makes use of the Byte
Stream Converter infrastructure and possibly give us a better bandwidth usage and
storage capability's. Processing is done using specialized algorithms running in
Athena framework in dedicated Tier-0 resources, and the alignment constants will be
stored and distributed using the COOL conditions database infrastructure. The work is
addressing in particular the alignment requirements, the needs for track and hit
selection and the timing issues.
Primary authors
Dr
Antonio Amorim
(Faculdade de Ciencias - Universidade de Lisboa)
Mr
Belmiro Antonio Venda Pinto
(Faculdade de Ciencias - Universidade de Lisboa)
Dr
Jochen Schieck
(Max-Planck-Institut für Physik)
Dr
Markus Elsing
(CERN)
Mr
Paulo Pereira
(Faculdade de Ciencias - Universidade de Lisboa)
Dr
Richard Hawkings
(CERN)
Dr
Salvador Garcia
(Instituto de Física Corpuscular, València)
Co-authors
Dr
Andre Anjos
(University of Wisconsin)
Dr
Hong Ma
(Brookhaven National Laboratory (BNL))
Dr
John Baines
(Rutherford Appleton Laboratory)
Dr
R.D. Schaffer Schaffer
(LAL Orsay, France)
