Difference between revisions of "JLab discusion on tracking priorities, March 5, 2009"

Revision as of 17:48, 5 March 2009

General comment: We have three tracking efforts. How can we leverage the work to date? How do we move forward effectively?

1. Short summary of current effort (~5 slides each)
   • David
   • [1] Simon
   • Mark
2. Issues impacting design/construction
   • Charge division in CDC
     • What does it buy us in pattern recognition or resolving L/R ambiguities?
     • How do connected wires add to ghost tracks?
     • Where and how many measurements are they needed?
     • On what time scale is this decision required (Jan 2010)?
   • sensitivity to B-field
     • Timeline - summer/fall 2009
     • Need estimates of changes of the field given "reasonable" variations in (coil positions, magnetic properties of iron, fringe fields and iron cladding)
     • key discriminators: momentum resolution, extrapolation to tof
   • wire configuration for FDCs
   • assignment of HV groups to wires (i.e. failure modes)
   • Effective size of forward hole (nominally 1 deg)
   • finalizing CDC geometry
   • ...we need to complete this list
3. Achieving a robust tracking program for single tracks (multiple scattering, energy loss and position resolution only)
   • Not necessarily the "final" or best resolution
   • High efficiency over all angles (~1-140, define definite boundaries in angle and momentum)
   • Efficiency defined based on a reasonable cut on tracking Chi2.
   • Studies must include transition between CDC and FDC.
   • Goal: create efficiency and momentum resolution plots on log scales (p vs theta) for pions and protons.
4. Studies of multi-track events
   • Are there any developments here beyond improvements/refinement of 2.? as a function of events with multiple tracks?
   • constraining the vertex?
5. Refinements/optimizations of the tracking code
   • Kalman filters
   • reference trajectory methods
   • ... work on these to the extent that they impact studies 1-3.