1. Forward TOF
Anton A. Izotov, PNPI

2. Wall and Side

3. Forward Wall Height: 140 cm Width : 46x10 cm, 20x5 cm
Thickness: 1.5 cm ?
Plastic: BC408
PMT : Hamamatsu 4998, 2083
Resolution: psec
Rate per bar:

4. Done and to do Desktop tests: since 2008
Beam tests: 2009 Apr 5-6 and more
First PANDA money: 2009 April
Future beam tests: 2009 December

5. Desktop tests Sr source (max 2 MeV electrons) 2x2x2 plastic
Face-to-face PMT 4998
Constant fraction and/or
Offline correction
70 ps for difference or 35 ps for half sum
140x5x1.5 plastic 300 ps for difference
Bad collimation?

6. Beam tests

7. How it looked like

8. Results σ=90 ps σ=190 ps Resolution 50-100 ps is possible
We see this resolution
“Characteristics of the TOF counters for GlueX experiment” Denisov et.al, NIM A494(2002)
But we need plastic >2.5 cm

9. In December Thicker plastic (3 cm).
More than one bar to reproduce results.
Constant fraction.
Energy dependence.
Coordinate dependence.
SiPM’s.

10. Answers Signal amplitude, expected noise: ≥ 1V, low noise.
Time resolution: psec.
Hit rate/channel, distribution over detector: Max 106 per bar.
FE chip: TDC: CERN/ECP-MIC HPTDC.
FEE location: as close as possible.
Data buffering inside TDC/ADC? Yes.
Latency: ?
Time ordering: yes.
Cannels >130 + side walls (PMT or SiPM)
Data rate: 107x2x(ADC+TDC) + side walls
Calibration: TDC&CDC time drifts. Else to be discussed.
TOF TDC-CDC and TDC-CALO correlation, probably track projection from straw tracker and trajectory length.