Gilles De Lentdecker(IIHE-ULB, Brussels), Ulf Mjornmark(University of Lund)
Description
TPC DAQ meeting in preparation for ILD meeting
From Vincent Boudry:
* Charge of the meeting
o Preparation of ILD DBD ? Plans until 2012
o What is missing in the ILD LOI ?
o What is needed for TB (stand alone & combined)
(could also be seen for ILD as a " small scale repetition")
* Needed developments for each sub-system (VTX, TPC, SIT, FCALs,
CALO, Muons)
o Expected data rates
+ Any change wrt to LOI ?
# Example: is Noise included
# Improved estimations ? Needed ?
* Are we SURE the ASICs memory is sufficient
near the beam pipe ?
o Technological choices & constraints
+ Time precision needed (clock distribution)
+ Data Concentration topology & technology
# redundancy of data/config paths ?
# Ethernet / fibre / custom ?
+ Power distribution & local power storage
# Power pulsing constraints in a 4T Field
# Specifications for cables & power route on PCBs
+ Grounding & EMC (ILD & TB)
+ External trigger distribution & handling
+ Fault tolerance
# use of FPGA or ASICs in DIF ?
# Local storage of HW configurations ? PROM ?
# Checking of loaded config ?
+ Busy handling (e.g. memory full)
o Data format
+ Fully specified ?
+ Common BX identification ? (ILD, TB)
+ Slow Control Data
o Price of equipment
o Constraints on the mechanics (vibrations, Power pulsing @
5Hz, push-pull)
* Cooperation & mutualisation of sub-system equipments philosophy
o What should be common ?
+ BX ID
+ Data Readout network & protocols ?
+ Stored Data formats ? (e.g. LCIO)
o What are the minimum criteria ?
* Central DAQ
o Reconstruction etc: not yet critical but not to be forgotten
o Price of Farm & storage
o Load balance: Switches ? UDP as a data packet format ?
o Mapping : Geometry mapping vs. HW configuration Database(s)
o RAW data format storage :
+ per event / per bunch train ?
# TPC integration time / recalibration
# Possibility of analysis for long living particle
decay
+ per sub detector ?
