FDC geometry study

• The baseline geometry (GeomA) is Hall-D Geometry V4 but with CDC GeomC
  • Configuration of chambers: U (0 degrees), V (+60 degrees), W (-60 degrees)
  • No half-cell offset between neighboring wire planes.
• Alternate geometry GeomB
  • Configuration of chambers: UU' (0 degrees), VV'(-60 degrees), WW'(+60 degrees)
  • Half-cell offset between primed and unprimed chambers
• In both cases I studied 3 cm separation between wire planes (nominal geometry) and 2 cm separation.
• Single pion tracks (p=0.5,1.0,1.5,2.5 GeV/c) generated from the center of the target and analyzed with the standard reconstruction
  • The Lorentz effect was turned on, but no other smearing was applied
  • The Riemann Fit was used to fit segments and determine the sign for the correction for the Lorentz effect
  • Full track reconstruction with standard (ALT1) least squares fitter (time-based, but with uncorrected positions along the wires)
• Check for probability of correct LR assignment in segment fitting: require difference between reconstructed position along wire and true position

to be less than 80 microns.