The possibility to overcome the SiPM noise in scintillation

detectors

V.Borejko, V.Grebenyuk, A.Kalinin, A.Timoshenko, L.Tkachev

It is array of about thousand of more smaller avalanche silicon photodiodes on the common substrate. and working on the common load.

They have many attractive characteristics: high gain, compactnes, low voltage and many others. But especially ineteresting property of SiPM - high one-photoelectron resolution. It is very valuable property allows to measure of amplification and to control the temperature dependence.

0 500 1000 1500 2000-200

0

200

400

600

800

1000

1200

1400

1600

1800

2000

D19600

Channels

NN

E= 60V

430nmS= 6,6V

Spectrum of Light Diod

SiPM S60

Nac=2*Nnoise*Nuse*Tr.t

Nac/Nuse=2*Nnoise*Tr.t.=2*10^6*100ns=0.2

0 50 100 150 200 250 300 350 400

0

2000

4000

6000

8000

10000

12000Y

Axi

s T

itle

X Axis Title

B C

0 50 100 150 200

0

10000

20000

30000

40000

50000

B C

Y A

xis

Title

X Axis Title

At the same time, this module may be considered as instrument without the inherent noise and together with one additional such module at a certain distance from the first they will be small size muon spectrometert may to imagine the row of moduls on upper surface of any arrangement and another row on the lower one. All outputs of all modules go to electronic center. Any modules can take part in m any coincidences (not only with one partner). Modern electronics can understand in this multyformity. There are same problem with contact between the fiber and SiPM, when the connection is made through the long fiber. The SiPM is necessary to introduce directly inside of strip(together with microchipe of amplifier. It is possible to day.

CONCLUSION1. SiPM—The well devices, but it has many dark noise2. The noise is decreasing by coincidences, that proportional to noise*Tresolving.3. 3We propose to use the coincidence of signals of two fibers, where fibers are

nearly each other and T may be less 10ns, although usually T about 100ns.4. Besides, the signals from fiber always slowly then noise pulses and it may be used

for selection.5. The suggestion may be realized in form separate module, disposed up and down

of main system and may used as multitelescope.6. The problems with contact between SiPM and fibers may be resolved by

introduce of SiPM and amplifiers microchips inside of strip.

Nac=2*Nnoise*Nuse*Tr.t

Nac/Nuse=2*Nnoise*Tr.t.=2*10^6*100ns=0.2

CONCLUSION

1.SiPM—The well devices, but has many dark noise2.The noise is decreasing by coincidences, that proportial to Nnoise*Tresolving,3.We propose to use the coincidence of signals of two fibers, where fibers are nearly each other and T may be less 10ns, although usually T about 100ns.4.Besides, the signals from fiber always slowly then noise pulses and it may be used for selection.5.The suggestion may be realized in form separate dtector module, disposed up and down of main system and may used as multi-telescope. 6.The problems with contact between SiPM and fibers may be resolved by introduced of SiPM and amplifiers microchips inside of strip.