RD-2011-04-18

From Electron Ion Collider
Jump to: navigation, search

This meeting will have one talk left over from 4-11 (Nilanga) and focus the rest of the agenda on simulations.

Presentation by Nilanga Liyanage can be found here pdf



MINUTES:

Hi all

We once again ran well beyond our alotted time in the discussion, but that as not all bad news since we have a lot to discuss.


SLIDES:

Nilanga presented slides on the ongoing work at UVa:

  • GEM Tracking being implemented in Super Big Bite and SoLID.
  • SBB based upon 40/50 cm^2 GEMs w/ APV25 readout.
  • Readouts via Flexible circuits to maximize live area.
  • 4m x 4m clean room...2nd coming soon.
  • Demonstrated 70 micron resolution.

Discussion included the following questions:

  • Position resolution vs angle.
    • Resolution will deteriorate to few hundred microns at ~30-35 degrees.
    • Degradation only along tilt direction (OK for endcaps, possible trouble for barrel).
    • Spherical GEMs exist (likely not useful for us)
  • Current GEM Production Limits
    • Limited by width of kapton roll
    • Length not limited by this.
    • Marcus & co working on large trapezoids (from last week).


SIMULATION ISSUES:

There was an open discussion on how to proceed with simulation issues. The general strategy was to identify a so-called Golden Channel measurement that drives the detector performance.

  • Existing studies show that Zeus resolution (0.85% + 0.25% * p) is only marginal!
  • Tracking's GOLDEN CHANNEL is F_L
    • Simulate a detector with seven tracking layers.
    • With perfect position measurement let X_0 vary as:
      • 0.1%, 0.2%, ... 1% per layer
    • Let position resolution (sigma) vary up to 200 microns.
    • Combined results sets the stage for detector parameters.
  • PID's GOLDEN CHANNEL is Delta-s (drives Kaon ID).
    • After much discussion, the decision is to wat for a more specific RICH design to simulate.
    • Klaus will present some thoughts at next week's meeting.


OTHER BUSINESS:

  • Next week we will hear from Klaus on RICH thoughts.
  • Next week we'll hear from Craig & Achim on the RD51 collaboration meeting highlights.

See you next Monday when we'll have a more open discussion about formulating a timeline for our work.

Thanks! Tom