Performance and calibration studies for run 420.
- CERN 18
- S420, bar with 3-layer spherical lens
- protons @ 7 GeV/c
- geometrical reconstruction
- delta t selection with s = 0.5 ns
Geant visualization of two extreme positions. z=250 mm:
z=850 mm:
Position calibration for the lens by scanning x-step (steps definitions) Show/Hide
For y-step:
=>lens's steps: [65,18.5] mm
Azhimuthal scan for z = 650 mm Show/Hide
Time difference cut scan (for bugged version) Show/Hide
Chromatic correction Show/Hide
before correction (beam data z = 850 mm):
after correction:
performance conparision:
Performance plots after all corrections (0.5 ns time constant cut) Show/Hide
Simulation with Ideal path in EV Show/Hide
all pathes:
Direct vs. reflected photon yield Show/Hide
0.5 ns time constant cut:
1.5 ns time constant cut:
comparision with simulation without transport efficiency (1.5 ns):
