PMT ScreeningPreshipping calibration - PowerPoint PPT Presentation
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Title:
PMT ScreeningPreshipping calibration
Description:
PMT Setting in the Freezer. Base circuit. Diffuser attached to UV LED. 50nsec. Setup. CAMAC ... Freezer(-32?) Gate. Signal. Charge Response. Charge Resolution ... – PowerPoint PPT presentation
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Title: PMT ScreeningPreshipping calibration
1
PMT Screening/Pre-shipping calibration
- July-August batch summary
- Shigeru Yoshida (Chiba)
IceCube Collab. meeting 2004
2
12 tubes monthly from Hamamatsu
- Fundamental measurements
- -- Charge Resolution
- -- P/V
- -- Gain HV scan
- -- Dark count
- CE mapping
- Gain mapping
3
PMT Setting in the Freezer
Base circuit
Diffuser attached to UV LED
4
Setup
LinuxPC
CAMAC
GP-IB
PCI Card
Crate Controller
Function Generator
CAMAC Interface
ADC
GP-IB Interface
Sync.
Signal
NIM
50nsec
Gate
Amp (10)
Freezer(-32?)
Discriminator
Gate Generator
UV LED
PMT
Scaler
Gate Generator
TTL-NIM Converter
5
Charge Response
6
Charge Resolution
7
P/V
2.7
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Gain HV scanJuly 2004
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Gain HV scanAugust 2004
Next Month Get rid of 50 W - the bare PMT gain
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Dark Count (0.3 pe threshold)
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Dark Count (Contd)
- Our measurements _at_ gain 5x107
- Operation Gain 1x107
- Measurements by GPIB-based digital scope
- rate _at_ 1x107 0.8 x rate _at_ 5x107
- Still a way above 500Hz.
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Position dependence of gain
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Position dependence of gain (Contd)
Taken into account by the Detector MC (ROMEO)
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Position dependence of CE
A representative Response has been implemented In
the detector MC
15
Setup
ATTENUATOR
Pressure meter
Temp monitor
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Absolute calibration of PMT efficiency
SF0077, SF0050, SF0061
Hirokos talk at the instrumentation WG
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Conclusion
- Gain, P/V, charge resolution in good shape
- 2 dimensional gain and CE map taken for the
detector MC - Absolute QE-CE calibration works fine
- Dark count higher than 500 Hz
Future outlook
- HV _at_ gain 107 is determined carefully
- DOM angular response
- DOM absolute calibration
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