LC TPC DAQ

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LC TPC DAQ

• Ron Settles Desy/MPI-Munich
• (see also foils by Guenter Eckerlin, and with the
  help of Nabil Ghodbane, Stefan Roth, Paul Colas
  and many others of the LC TPC group)
• Contents
• the LC TPC
• some of the technical issues
• some of the daq issues
• a model for the LC TPCdata rates

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LC Note update to LC-DET-2002-008 being written
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some foils courtesy Stefan Roth
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(some foil courtesy Nabil Ghodbane)
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Model for LC TPC DAQ studies

• data rate determined by backgrounds
• 1.3 ? 106 pads X 1000 t.b. 1.3 ? 10? voxels
  ( 1
  voxel 1 word )
• 0.3 background occupancy (TDR value) in one TPC
  picture (one picture
  50µsec drift time)
• ? 0.39?107 words in 50µsec, i.e., 150 BX (Tesla)
  or 192 BX (NLC)
• For words/sec, multiply by 100 (20 pict./train X
  5 train/s) for Tesla or 120 (train/s) for NLC
• ? 0.39?10? words/sec for Tesla and NLC,
• i.e., 80Mwords/train for Tesla or 3Mwords/train
  for NLC
• ? 4 Gbit/sec for Tesla and NLC with a 10-bit
  digitizer
• CMS designing for 50-500Gbit/sec, so that DAQ SF
  (safety factor) 10-100, i.e. that much more
  background tolerable in TPC from DAQ point of
  view