Performance and calibration studies for runs with different azimuthal angle of the prototype.
- CERN 18
- bar with 3-layer spherical lens attached to the edge of the prism
- 2.5 (S409), 5 (S406), 10 (S407), 15 (408) degree azimuthal angle
- p/pi @ 7 GeV/c
- geometrical and TI reconstruction
- delta t selection with s = 0.5 ns
- with beam direction correction
- with per-PMT Cherenkov angle correction
Performance compared to phi = 0 (all beam data):
![](/~rdzhigad/data/prt/r408/join_scan_phi/nph_beam.png)
![](/~rdzhigad/data/prt/r408/join_scan_phi/spr_beam.png)
Geometrical reconstruction:
![](/~rdzhigad/data/prt/r408/join_scan_phi/sep_gr_beam.png)
Time imaging:
![](/~rdzhigad/data/prt/r408/join_scan_phi/sep_ti_beam.png)
Comparison to geant4 simulation:
![](/~rdzhigad/data/prt/r408/join_scan_phi/nph_2.5_5.png)
![](/~rdzhigad/data/prt/r408/join_scan_phi/nph_10_15.png)
Geometrical reconstruction:
![](/~rdzhigad/data/prt/r408/join_scan_phi/sep_gr_2.5_5.png)
![](/~rdzhigad/data/prt/r408/join_scan_phi/sep_gr_10_15.png)
Time imaging:
![](/~rdzhigad/data/prt/r408/join_scan_phi/sep_ti_2.5_5.png)
![](/~rdzhigad/data/prt/r408/join_scan_phi/sep_ti_10_15.png)
Per-angle plots:
Rotation scans for prototype at 15 deg azhimuthal angle. Separation power of the geometrical reconstruction as a function of the azhimuthal angle deviation from nominal value (after per-PMT Cherenkov angle correction):
Polar angle scan:
Example for 30 degree without per-PMT Cherenkov angle correction:
![](/~rdzhigad/data/prt/r408/408a/1/sep_gr_4_1_nc.png)