1. Prospect of SiPM application to TOF in PANDA
Top view of PANDA detector
TOF and PID in PANDA
Test bench for SiPM application
Preliminary results of time resolution
Conclusion
Things to do
Barrel DIRC
Barrel TOF
Endcap DIRC
Forward TOF
Forward RICH

2. Prospect of SiPM application to TOF in PANDA
PANDA detector
Acceptance
of Forward Spectrometer:
± vertical
± 100 horizontal
Barrel TOF
Side TOF walls
Front TOF wall
- Front wall
140x5x1.5 сm3, 20 tiles,
140x10x1.5 сm3, 46 tiles
- Side walls inside of dipole magnet
100x10x1.5 cm3, 14 tiles at each poles
made of plastic scintillator
BC408.
Time resolution  70 psec
Traditional approach:
PMT R4998 (for 5 cm tiles)
PMT R2083 (for 10 cm tiles)

3. Goal:
Identification of forward moving charged particles detected by FS with momenta below 4-5 GeV/c. TOF resolution ~70 ps
SiPM can provide necessary time resolution
Side walls of the TOF detector should operate
in magnetic field ~0.5T
SiPM insensitive to magnetic field
SiPM is a good solution for TOF located in magnet
 No light guides to bring light out of magnetic field
 No loss of light in fiber
 No bundle attachment to multichannel PMT and e.t.c.
Forward TOF Detector

4. Mass reconstruction with TOF
Effective separation of the pions and kaons up to 3 GeV/с ;
kaons and protons up to 4 GeV/c
G.Gavrilov

5. Front Wall count rate simulation at 15 GeV/c proton beam
Histogram bin is equal to width of central tiles (5 сm)

6. Electronics test station for TOF
TDC – time resolution ~ 25 ps per channel
• PMT - Hamamatsu R4998 (diam. 25 mm, rise time 0.7ns)
• FD - shaper discriminator
TOF
TOF*
Computer,
data analysis
ntuple
Dt, q1, q2
Scintillator NE110
10x12x12 mm3
PMT R4998
G.Gavrilov

7. Electronics test station for TOF
results
No Constant Fraction FD
 = 105 psec
 = 69 psec
T.Tanimori, M.Yoshioka et. al.
NIMA 216(1983)57-65
With offline
compensation
G.Gavrilov

8. Electronics test station for TOF
results
Constant Fraction Discriminator
 = 74 psec
Crystall + PMT + electronics = 64.5 ps
PMT + electronics = 62 ps
electronics = 20 ps
PMT(2)= 58 ps
PMT(1)= 40 ps
t1-t2
 = 64.5 psec
With offline
compensation
t1-t2 (corr)
G.Gavrilov
Yu Naryshkin, PNPI seminar, 21 October 2008

9. Test station for SiPM application to TOF
3 BC408 plates :
140*10*1.5 cm3
140* 5*1.5 cm3
100*10*1.5 cm3
6 PMT Hamamatsu:
4 - R4998
2 - R2083
The prototype with BC408 plastic
140*5*1.5 cm3 is ready for testing
SiPM
G.Gavrilov

10. Proton beam test station in PNPI
1 GeV proton beam
Proton beam test station in PNPI
Test conditions
Protons E= 500900 MeV with diam.10 mm
Tracking of the protons through the tile with   0.5 mm
Beam scan along the tile (70cm)
Counting rate 30 kHz …
Ageing study of SIPM is available at proton beam
Flux up to 108 109 cm-2
G.Gavrilov

11. Conclusion PNPI is interested in SiPM investigation for TOF in PANDA
Electronic test station for TOF timing studies is available and can be used for SiPM
Eventual beam test with ~1 GeV protons is possible
G.Gavrilov

12. Things to do Procurement of SiPM for TOF
TOF test station to be adopted for SiPM
SiPM test requires a high resolution TDC (CAEN TDC V1290N or CAEN TDC V775N)
Work out Cooling system for SiPM
MC optimization of light guides-SiPM
G.Gavrilov

13. Scintillator tile SiPM SiPM Summing amplifier G.Gavrilov
Peltier cooler
SiPM
Summing amplifier
CFD
G.Gavrilov

14. Electronics for TOF CFD module with DL for fast pulses
Time resolution ~40 psec
Dynamic range 1:50
Coincidence module
Time range 210 nsec
G.Gavrilov

15. Electronics for TOF CFD module with DL for fast pulses
100 psec
CFD module with DL for fast pulses
Time resolution ~40 psec
Dynamic range 1:50
G.Gavrilov

16. Electronics for TOF Charge sensitive amplifier – leading edge 3 nsec
Amplifier module:
amplification coefficient 18 db
noise coefficient 3.6 db, dynamic range 1GHz
G.Gavrilov