Pre-shipping PMT screening at Chiba

Chiba UniversityShigeru Yoshida for

Kazuhiro “Jee” Fujimoto

FreezerProduced by Nihon Freezer

Temp –32degree

PMT Setting into Freezer

Base circuitBase circuit Diffuser attached to UV LED

50nsec

CAMACCAMACCrate

Controller

CrateController

ADCADC

GP-IBGP-IBFunctionGenerator

FunctionGenerator

NIMNIM

Amp (*10)Amp (*10)

DiscriminatorDiscriminator

Gate GeneratorGate Generator

ScalerScaler

PCI CardPCI CardCAMACInterface

CAMACInterface

GP-IBInterface

GP-IBInterface

Gate GeneratorGate Generator

LinuxPC

TTL-NIM Converter

TTL-NIM Converter

Sync.Sync.

UV LED

PMTPMT

Freezer(-32 )℃

Gate

Signal

Setup

ADC Spectrum（ Low Gain)

Without Amp With Amp

ADC Spectrum(High Gain)Without Amp With Amp

ADC Spectrum(Log Scale)Without Amp With Amp

HV 2000V

Gain vs HVW/o Amp w/ Amp

Gain with Amplification calibrated

CrosscheckWithout Amp With Amp

Comparison

Light w/o amp

Dark w/ amp

Gain Summary

Gain at 2000V

Our Criteria is 5×10+7 with 2000 V.

11 out of 14 PMTs satisfied it.

SF0001 SF0004 SF0010 SF0016 SF0023 SF0030 SF00374.05E+07 5.05E+07 1.21E+08 1.24E+08 3.83E+07 4.58E+07 7.56E+07

SF0043 SF0050 SF0056 SF0067 SF0070 SF0080 SF00861.11E+08 3.79E+08 1.91E+08 2.63E+08 2.14E+08 1.58E+08 2.91E+08

8μsec

CAMACCAMACCrate

Controller

CrateController

ADCADC

GP-IBGP-IBFunctionGenerator

FunctionGenerator

NIMNIM

Amp (*10)Amp (*10)

DiscriminatorDiscriminator

Gate GeneratorGate Generator

ScalerScaler

PCI CardPCI CardCAMACInterface

CAMACInterface

GP-IBInterface

GP-IBInterface

Gate GeneratorGate Generator

TTL-NIM Converter

TTL-NIM Converter

Sync.Sync.

UV LED

PMTPMT

Freezer(-32 )℃

Setup for the noise measurement

Gain vs Noise Rate

0

200

400

600

800

1000

1200

0.00E+00 5.00E+07 1.00E+08 1.50E+08 2.00E+08 2.50E+08 3.00E+08 3.50E+08 4.00E+08

NoiseRate[Hz]

Gain

PMT # SF0050

Gain vs Noise Rate

0

100

200

300

400

500

600

700

800

900

1000

0.00E+00 5.00E+07 1.00E+08 1.50E+08 2.00E+08 2.50E+08 3.00E+08 3.50E+08 4.00E+08

NoiseRate[Hz]

Gain

HV　 is 2000V

Summary

Gain, P/V and noise has been measured for the 14 tubes before shipping to UW/DESY/StockholmNo problems on noise and P/V has foundSome low gain tunes needs amplification for single p.e. measurement with HV < 1700 V3 tubes out of 14 has might-be-too-low gain of ~4x107 with 2000 VThe excel table and ADC spectrum data can be downloaded from our website.

Error

Model turn SF0030 SF0037 SF0067FittingError 2.35E+05 2.87E+05 7.39E+05AmpError 6.49E+05 1.33E+06 3.12E+06DividerError 2.89E+06 5.94E+06 1.39E+07Total 2.97E+06 6.09E+06 1.43E+07Gain 3.96E+07 8.14E+07 1.90E+08