FTBF has two TOF systems available to users, upon request, but it takes a bit of time to set up, so one week’s notice is appreciated.
- TOF1 is based on Cherenkov light in PMT windows
- Up to 10 ps time resolution
- Typically 7-8 meters distance between “start” and “stop” counters. Time difference of particles with different mass is a linear function of the distance, the longer distance the bigger time difference.
- Counters cover beam transverse size up to 40 mm
- Momentum threshold (n=1.5). P/c: 0.2 GeV/c – muons, 0.8 GeV/c – kaons, 1.5 GeV/c – protons
- TOF 2 is based on scintillator counters
- Each scintillator is of octagon shape, 10 cm edge to edge, thickness could be 0.5 cm for “start” counter and 1.9 cm for the “stop” one
- 100-200 ps time resolution, depending on scintillator thickness
- Typically 30 meters base (B) distance between “start” and “stop” counters
- 10cm2 aperature
- Can Identify protons below 7 GeV/c and separate kaons from pions below 3 GeV/c