comparison of 3 types of scintillator strips and 2 types of reflector films miho nishiyama shinshu-u...
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Comparison of 3 types of scintillator strips
and 2 types of reflector films
Miho NISHIYAMAShinshu-U
Light yield of 3 scintillator strips have been measured using -ray source.1. fiber read out strip + radiant mirror film2. direct read out strip + radiant mirror film3. Extruded strip (KNU) + TiO2 paint
Light yield of direct read out strip with 2 types of reflector films have been measured using -ray source.1.direct read out strip + radiant mirror film2.direct read out strip + reflector film (manufactured by Kimoto Co. Ltd)
Size is 1 x 4.5 x 0.3 cm for all types of scintillator strips.
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• Light yield of the scintillator strip is determined as:
Np.e = Mean ADC counts for -ray / d d = Signal corresponds to 1 photoelectron (ADC counts)• The parameter “d” is necessary to determine Np.e.• It has been measured with dark noise events.
Determination of the MPPC gainusing dark noise events
Clock Generator Gate Generator
AMP(x63)MPPC
ADC
Bias Voltage:78[V]
Thermostatic chamber (25 )℃
1 [kHz]
Setup
Signal input
Gateinput
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d
Bias Voltage : 78 [v]
Nu
mb
er
of E
ven
ts
MPPC signal (ADC counts)
Determination of the MPPC gainusing dark noise events
Log scale
d = 25.51±0.03 (ADC counts)Gain= (6.327±0.001)×105
d
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Measurement of light yieldof the scintillator strips
using -ray source
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PMT
Setup
Discriminator Gate Generator
90SrMPPC
ADC
(Vbias = 78 [ V])
Trigger scintillator
Thermostatic chamber (25 )℃
Strip scintillator
Collimator with2 mmhole
Position of-ray source ×
2.25 2.25 cm
Signal input
Gateinput
MPPC
AMP (x63)
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Light yield of 3 types of strip scintillatorsFiber read out Direct read out Korean extruded
fiber : Np.e = 25.0 [p.e]direct : Np.e = 18.7 [p.e]Extruded : Np.e = 12.7 [p.e]
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Light yield of direct readout scintillator with 2types of reflector films
3M Radiant mirror film
Kimoto Reflector film
3M :Np.e = 22.1[p.e]
Kimoto :Np.e = 18.3[p.e]
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Summary• Light yields of 3 different types of scintillator strips are : ・ Fiber read out : 25.0 photoelectrons ・ Direct read out : 18.7 photoelectrons ・ Extruded : 12.7 photoelectrons (There may be ~10% systematics from optical coupling issue)
• Extruded scintillator shows half light yield of the fiber read out strip. improvement is ongoing by KNU guys.
• Light yields of direct readout strip with 2 types of reflector films : ・ radiant mirror film : 22.1 photoelectrons ・ reflector film by Kimoto Co.Ltd : 18.3 photoelectrons
• Results with the Kimoto film shows 82.88% light yield of results with the 3M radiant mirror film.
We may replace the 3M film with Kimoto.
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Plans
• Measure light yield with position scanning
• Investigate effect of MPPC photon detection efficiency– Change bias voltage– Determine PDE from other studies
• Measure strip-by-strip variation of light yield
• Test 2 mm thick scintillator strips
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Backups
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Strip non-uniformity measured at DESY beam test
Kuraray strip with fiber Kuraray direct KNU strip with fiber
~75% ~66% ~48%
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再現性
MPPCの取り外しあり平均 : (2.49±0.01)×102