TDIS Bi-monthly meeting, 2017 November 14

From Hall A Wiki
Jump to: navigation, search

Back to Tagged DIS run group >> Bi-monthly TDIS meetings

previous meeting << >> following meeting

Organizational details

11:00 AM, JLab meeting room: CC A110

To join the Meeting:
To join via Room System:
Video Conferencing System: -or-
Meeting ID : 550335940
To join via phone :
  1. Dial:
    +1.408.740.7256 (United States)
    +1.888.240.2560 (US Toll Free)
    +1.408.317.9253 (Alternate number)
    (see all numbers -
  2. Enter Conference ID : 550335940



Notes from Thia (also available as PDF)

  • Nilanga update
    • getting ready for proposal
    • Eric Christy to join TPC and MRI efforts
    • Working on draft proposal
  • Ed update
    • Pursuing front end cards and (tested!) readout unit used in ALICE
    • SAMPA chip run January/February
    • Need to map connector on front end card into our GEMs – only thing we would have to develop
    • PCI express platform (only needs high end PC, no crate)
    • ALICE and LHCb will both use this (unique FPGAs, interface in ToolKit)
    • SAMPA chip is preamp, on front end card
    • All is also rad hardened (readout must be in non-radiation area)
  • Thia
    • Rolf requesting streaming DAQ budget
    • Next meeting’s talk – Ed to present draft budget!
  • Simulation
    • Marco working on rates from other particles, also considering readout planes and other materials
    • Also looking at occupancies at different radii to help with pad size determination
    • Rachel working on Garfied for mTPC design, hasn’t moved further on resolution for kaon-TDIS
  • See Paul's talk! Some discussion during…
    • Assumes mTPC
    • Useful range for particles is 90 +/- 70 degrees (too much energy loss in target beyond that)
    • Nilanga comment… to go down to 200 ns need to have some pattern-recognition programming? Then, do we really need to keep reading for 1 microsecond? Paul just trying to get some idea of pulses likely to overlap on same pad – how much effort do we need to do to disentangle multiple pulses?
    • Thia comment that highest rate has strong (~90 degree) angular dependence, likelihood that two tracks come at same angle small
    • Total occupancy is more like ~65%
    • Bogdan comment that we could look at single hits first, then use multiple hit pads for additional analysis to improve resolution (maybe only 3 pads in a track of 20 would be difficult to distinguish)
    • Comparing to ALICE… they have a 4 layer GEM, we would have 3 (or maybe 2 per Nilanga)
    • Ed: SAMPA has a 20MHz option – could have 50 ns sampling (but lowest shaping time is still 160 ns) – higher sampling rate could help us distinguish 2 pulses
    • Need to add time stamp to data rate calculations
    • 4 GB/s, reduced by level 2 (for instance using only 3 TPC sub-chambers) to get lower rate going to disk
    • Nilanga noted that ALICE has recognition software, and reduce their rate on the board to 1GB/s
    • Also use zero suppression, pulse characterization,…
    • 4 GB/s is worst case (doesn’t take occupancy into account, etc.) – doable!
    • NIlanga question… can we operate as 10 independent chambers? Yes… stamp to correlate back together.
  • Bogdan announced mid-February SBS collaboration meeting – should have a TDIS talk
  • Also – please volunteer for our invited talk at Chile workshop!
  • Streaming DAQ workshop at MIT end of January, Graham planning to attend