Performance of the Barrel DIRC for bars with rounded sides.
- PandaRoot simulations without field
- configuration with narrow bars, 3 layer spherical lens, and 8 MCPs layout with ~17 mm gap
- default radii of the lenses ([95,50])
- pions and kaons @ p = 3.5 GeV/c @ theta = 22 deg @ phi = 10.825 deg
- time-imaging reconstruction with full-simulated pdfs
- 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
Bar with rounded sides:
![](/~rdzhigad/data/barrel/bar_sagitta/sagitta.png)
Geant4 (pandaroot) simulation with 1000 mkm sagitta:
![](/~rdzhigad/data/barrel/bar_sagitta/bar_sagitta.png)
Geometrical reconstruction (without per-pmt Cherenkov angle correction):
![](/~rdzhigad/data/barrel/bar_sagitta/spr.png)
Difference between 10 mkm (red) and 100 mkm (blue):
![](/~rdzhigad/data/barrel/bar_sagitta/spr_10_100.png)
![](/~rdzhigad/data/barrel/bar_sagitta/sep.png)
Different shapes of the edges:
![](/~rdzhigad/data/barrel/bar_sagitta/sagitta_shapes.png)
Geometrical reconstruction (with per-pmt Cherenkov angle correction):
![](/~rdzhigad/data/barrel/bar_sagitta/nph_sagitta.png)
![](/~rdzhigad/data/barrel/bar_sagitta/spr_sagitta.png)
![](/~rdzhigad/data/barrel/bar_sagitta/sep_gr_sagitta_ideal.png)
Time imaging with PDFs from imperfect bar (with corresponding shape):
![](/~rdzhigad/data/barrel/bar_sagitta/sep_ti_sagitta.png)
Time imaging with PDFs from ideal bar:
![](/~rdzhigad/data/barrel/bar_sagitta/sep_ti_sagitta_ideal.png)
Deviation of the photon direction relative to the initial vector as the function of number of reflections (10 mkm). Example for 3 photons using "shape d":
![](/~rdzhigad/data/barrel/bar_sagitta/div_10.png)
Accumulation for ~2k photons:
![](/~rdzhigad/data/barrel/bar_sagitta/dir_10.png)
100 mkm:
![](/~rdzhigad/data/barrel/bar_sagitta/div_100.png)
![](/~rdzhigad/data/barrel/bar_sagitta/dir_100.png)
Shape f with 100 mkm:
![](/~rdzhigad/data/barrel/bar_sagitta/div_100_f.png)
![](/~rdzhigad/data/barrel/bar_sagitta/dir_100_f.png)
Cancellation in shape f:
![](/~rdzhigad/data/barrel/bar_sagitta/refl_all.png)
![](/~rdzhigad/data/barrel/bar_sagitta/refl_zoom.png)