radii scan of the lens

pi/K likelihood separation as a function of the lens parameters for different polar angles of the charged particles.

  • PandaRoot simulations without field
  • configuration with narrow bars, 3 layer spherical lens, and 8 MCPs layout with ~17 mm gap
  • lenses with minimal thikness of each layer of 1.5, 2 (default) and 3 mm (corresponding thickness of whole lens are 13.36, 14.86, and 17.86 mm)
  • PbF2, default radii = [95,50]; radii of the ordered lens prototype = [94.5,47.3]( see comparision)
  • pions and kaons @ p = 3.5 GeV/c @ phi = 10.825 deg
  • geometrical and time-imaging reconstruction with full-simulated pdfs
  • 10M samples are used for the LUT generations
  • 30k tracks for pdf generation (per each particle species); 5k for determining separation
  • ~2 mrad tracking resolution
  • realistic time precision
  • QE=18(24)% ( black curve). CE=95%
  • spatial QE = 1

Profiles of the lenses with minimal thickness of each layer of 2 and 3 mm:

Performance:

1.5 mm 2.0 mm 3.0 mm