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As was announced at the Dresden collaboration meeting, we are organizing
a two-day workshop on trigger and online computing issues, to be held at
Caltech on the Thursday and Friday before the December collaboration
meeting.
There are two major goals and some very interesting topics to cover:
o Prepare for the medium-to-long term (Run 6 and beyond)
future of BaBar, through to the 2-3*10^34 era
- Focusing on triggering (L1&L3) and the DAQ-related parts of the
online
- Evaluation of luminosities, data volumes, event rates, and
background severity and their consequences
- Will these require more than just maintenance tweaks to the
existing trigger, DAQ, and event filtering system? (Quite
likely...)
- How can we best use the new DCZ triggering capabilities at
Level 1?
- Do we need new ideas in Level 3?
- Beyond the DCH "decimation" and front-end-FEX developments,
what additional interventions may be needed in DataFlow?
- The whole triggering and filtering strategy will be on the table,
as the luminosity and background increases foreseen will put real
stresses on the overall system
[There will be an additional online workshop early in 2005 that
will cover issues outside the event data acquisition chain: Run
Control, Detector Control, databases, etc.]
o Start thinking about these issues in the context of a possible
Super-B-factory detector
- The aim is to identify the key challenges in triggering and all
parts of DAQ and online computing, and enumerate possible
technologies for investigation
- Changes expected in detectors (esp. tracking!) require new
trigger hardware and algorithms
- Building a fast Level 1 tracking trigger for an all-silicon
tracker is not a "solved problem" and may be challenging;
if it's not fast enough the front end pipelining may get very
expensive.
- Data acquisition and processing demands at 5-7*10^35 are very
stringent!
- Can an "open trigger" strategy really be made to work in this
environment?
- Conceptual design work needs to start soon to identify issues for
possible LOI work. Some of these issues (e.g., the overall choice
of trigger strategy, the possibility of L1 track triggering with
an all-silicon tracker, and the cost of very high rate and/or
heavily pipelined front end electronics) are potential design-
drivers for the detector and need to be understood early.
We expect to spend roughly a day on each of the two main goals. The
meeting is intended to be all-plenary, but with possibilities for
breakout sessions if they come to seem desirable.
We're inviting:
o The existing online, DAQ electronics, and trigger experts
o New people (groups?) interested in taking a major role in the trigger
o Anyone interested in the physics implications of trigger/filter design
... and we're inviting some interesting speakers from outside
BaBar; e.g., with expertise from FNAL in silicon tracking triggering.
One of the goals of the workshop is to make clear that there is a need
and a substantial opportunity for new contributions, in exploiting the
new DCZ capabilities and improving filtering at Level 3 and beyond!
We are therefore very interested in having more than just the "usual
suspects" come to this workshop.
Please contact Gregory Dubois-Felsmann if you have any questions or
would be interested in attending or giving a presentation.
This information is taken from the Caltech Admissions Office and is reasonably up to date.
The High Energy Physics group also has an "information for visitors" page, but it is quite out of date.