Effect of the bar box window between radiator bars and lenses on performance.
- DIRC@EIC, ePIC, standalone simulation
- 3-layer spherical lens with sapphire, r=[62,36]
- 3 mm pixels HIQ400, CE=95%
- pi/K @ 6 GeV/c
- 0.5 mrad track smearing at tracking layer
- phi = 0 (no field); vertex y-shifted by 0.5*barwidth (to hit middle of the bar)
- 0.1 ns time precision
- transport efficiency fitted to BaBar data
- geometrical reconstruction with averaged LUT from 15M photons
- GR with per-PMT and chromatic corrections
- 20k tracks for pdf generation (per each particle species) (generated with 0.5 mrad track resolution); 5k for determining separation
Comparison for a window with 25 mm height, 350 mm width and different thickness (1,2,4 mm). Event display for 2 mm thick window (30 deg polar angle), side view:
![](/~rdzhigad/data/eic/barbox_window/barbox_window_2mm.png)
Top view (shows photons leaking through sides):
![](/~rdzhigad/data/eic/barbox_window/barbox_window_2mm_top.png)
4 mm thick window. Side view:
![](/~rdzhigad/data/eic/barbox_window/barbox_window_4mm.png)
Top view:
![](/~rdzhigad/data/eic/barbox_window/barbox_window_4mm_top.png)
Performance plots. Photon yield after GR:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window/nph_gr_pik_window.png)
Photon yield after TI:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window/nph_ti_pik_window.png)
SPR:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window/spr_pik_window.png)
GR:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window/sep_gr_pik_window.png)
TI:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window/sep_ti_pik_window.png)
8 mm thick window with black sides. Side view:
![](/~rdzhigad/data/eic/barbox_window/barbox_window_bs_8mm.png)
Performance plots for window with back sides. Photon yield after GR:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window_bs/nph_gr_pik.png)
Photon yield after TI:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window_bs/nph_ti_pik.png)
SPR:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window_bs/spr_pik.png)
GR:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window_bs/sep_gr_pik.png)
TI:
![](/~rdzhigad/data/eic/barbox_window/join_scan_window_bs/sep_ti_pik.png)