Reconstruction performance of the beam data with calibration laser.
- CERN 18
- bar with 3-layer spherical lens attached to the edge of the prism
- p/pi @ 7 GeV/c; 25 degree polar angle
- geometrical and TI reconstruction
- delta t selection with s = 0.5 ns
- with beam direction correction
- with per-PMT Cherenkov angle correction
Hit patter and propagation time for configuration with (top) and without (bottom) calibration laser:
![](/~rdzhigad/data/prt/beam_laser/hp_withlaser.png)
![](/~rdzhigad/data/prt/beam_laser/hp.png)
Hit multiplicity for beam + 1MHz laser in [-600,600] ns time window:
![](/~rdzhigad/data/prt/beam_laser/draw_mult_laser/mult.png)
![](/~rdzhigad/data/prt/beam_laser/draw_mult_laser/mult_logy.png)
Hit multiplicity for [0,100] ns time cut:
![](/~rdzhigad/data/prt/beam_laser/draw_mult_laser/mult_cut.png)
Blue and red lines show propagation time without and with calibration laser, respectively.
![](/~rdzhigad/data/prt/beam_laser/wn.png)
Beam data with calibration laser in comparison to simulation as the function of laser intensity. X axis shows laser intensity in 100 ns window.
![](/~rdzhigad/data/prt/beam_laser/join_scan_noise/nph.png)
![](/~rdzhigad/data/prt/beam_laser/join_scan_noise/spr.png)
Geometrical reconstruction:
![](/~rdzhigad/data/prt/beam_laser/join_scan_noise/sep_gr.png)
Time imaging:
![](/~rdzhigad/data/prt/beam_laser/join_scan_noise/sep_ti.png)
Trigger rates (GPIO 1 trigger 1 = ch 512; GPIO 2 trigger 2 = ch 513; GPIO6 Trigger box (LEVCON, NIM out) TRG cable from Trg1 (can be changed) or Laser cable (since 1.8.2018) = 517; GPIO 9 Trigger box (LEVCON, LVDS out) TRG cable from Trg1 (can be changed)) = ch 520. PiLas intensity 15.0% :
![](/~rdzhigad/data/prt/beam_laser/pilas_15.png)
PiLas intensity 13.2% :
![](/~rdzhigad/data/prt/beam_laser/pilas_13.2.png)
Update 20.06.24. Selecting hits in [-50,50] time window. Multiplicity of detected photons vs event number:
![](/~rdzhigad/data/prt/beam_laser/mult_vs_event.png)
Accumulated multiplicity of all data in [-50,50] time window:
![](/~rdzhigad/data/prt/beam_laser/draw_mult/mult.png)
![](/~rdzhigad/data/prt/beam_laser/draw_mult/mult_log.png)
Reconstruction done using [-50,+50] slices in multiplicity after [-50,+50] time selection. "laser photons" shows the contribution of laser photons on top of Cherenkov photons from the event (50 photons @ 25 degree). Geometrical reconstruction:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t/sep_gr_laserscan.png)
Time imaging. PDFs obtained using all data:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t/sep_ti_laserscan.png)
Comparison to the simulations. Changes to previous analysis: [-25,+25] slices in multiplicity after [-50,+50] time selection; per-pmt correction done per data slice; 17 hodo fibers selection (for more stat); laser photons in the simulation is now distributed in [-50,50] window. Geometrical reconstruction:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/nph_laserscan.png)
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_gr_laserscan.png)
Time imaging. PDFs obtained using all data:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_ti_laserscan.png)
Homogeneous laser vs 1 ns pulse (for simulated data). GR:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/nph_laserscan_pulse.png)
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_gr_laserscan_pulse.png)
Time imaging:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_ti_laserscan_pulse.png)
Comparison of photon yield distributions in case of no dead time for homogeneous (top) and 1 ns pulse (bottom) lasers (250 laser photons):
![](/~rdzhigad/data/prt/beam_laser/nph_0ns_250_homog.png)
![](/~rdzhigad/data/prt/beam_laser/nph_0ns_250_pulse.png)
Simulation with 40 ns dead time, 1 ns pulse and 250 laser photons:
![](/~rdzhigad/data/prt/beam_laser/nph_40ns_250_pulse.png)
Beam data with [200,300] laser photons slice:
![](/~rdzhigad/data/prt/beam_laser/nph_data_250.png)
=> the time window for simulation was [-50,50] and for the data selection [-100,100], simulation with [-100,100] time window:
![](/~rdzhigad/data/prt/beam_laser/nph_40ns_250_pulse_100.png)
Selection for final plots:
- [-50,50] ns time window for data and sim
- [-75,75] slices for beam data; this also used in simulation
- 40 ns dead time
- 1 ns spread of laser pulses
- 17 hodo fibers (vs. 8 used for run 403 ("golden"))
- same tof selection as for run 403
- 65 was used as a raw number of detected photons without laser pulses (to account for Cherenkov photons)
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/nph_laserscan_f2.png)
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_gr_laserscan_f2.png)
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_gr_laserscan_f2e.png)
TI:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_ti_laserscan_f2.png)
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_ti_laserscan_f2e.png)
Compare different sampling range for the beam data. GR:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/nph_laserscan_f3.png)
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_gr_laserscan_f3.png)
TI:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_ti_laserscan_f3.png)
GR for [-25,25]:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_gr_laserscan_f4.png)
TI for [-25,25]:
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_ti_laserscan_f4.png)
![](/~rdzhigad/data/prt/beam_laser/join_scan_t_ws/sep_ti_laserscan_f4d.png)