1. LSO: Energy resolution
Integrated charge
Assume gain = 10^6
Sum of 4 layers.
E resol.
= 17.3% in FWHM.
~60% efficiency
( E > 400keV) pC

2. LSO:Coincidence Timing resolution
Select events around peak.
( E > 400keV)
~36% of efficiency.
(0.6x0.6)
Timing resolution
= ~1.7 ns ns

3. Position Measurement by Timing Difference(LaBr3)
Trans. Line X A B X T1 T2
Recon. X = (T1-T2)*1mm/10ps/2
T1, T2 : leading edge timing
5mV threshold.
Beam entering position
A( 0mm, 0)
B( 22mm, 0)

4. Position measurements: Energy weight vs Time difference
Beam Position B:( X =22mm)
Beam Position : A( X = 0mm) mm mm

5. Summary and Plans 4 layers of 10mm thick continuous LSO
E resol = ~17%(FWHM)
T resol = ~1.7ns(FWHM)
Effi( E>400keV) = ~36%
Position measured by timing difference
is worse than energy weighted method.
Performance near edge.
Try Pixelated X-tal+MCP.
5. Validation, real tests.