production pmt testing and work on site with prototype tank university of california, los angles...
DESCRIPTION
Production PMT test system in push-button operation Detailed understanding of energy calibration of individual tanks in engineering array Using this to understand energy cal of showers Regular contributions to site In One Year…TRANSCRIPT
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Production PMT Testing and Work
on Site with Prototype Tank
University of California, Los AnglesDepartment of Physics and
Chris JillingsChris Jillings
November, 2000
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Production PMT testing1. Requirements2. Light source3. Electronics and DAQ
Prototype tank (Sept 2000) Low gain or high gain
Talk Outline
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Production PMT test system in push-button operation
Detailed understanding of energy calibration of individual tanks in engineering array
Using this to understand energy cal of showers
Regular contributions to site
In One Year…
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48 PMTs in one day Measure
1. Linearity2. Gain / Dark rate vs voltage3. Pulse shape4. Afterpulsing
Production PMT Testing
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The Lab in the STRB
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Schematic
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Overview
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Need 1% stability for linearity
Timing on 25 ns scale Wide range of brightness
Light Source
Blue LEDBlue LED
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TTL logic to control two LEDs in each source
Analog line to control brightness
Counter/timer to trigger source PCI 6025E from Nat. Inst. Small amount of custom TTL
circuitry
Light Source
Our current triggering circuit will work
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High Voltage Standard system (CAEN SY403) HV supply on the base
Needs 5V for powerAnalog level to control HV
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Disc. for noise rate Two ADC’s per PMT
1. Auger has 15 bits dynamic range
2. Commercial ADC has 10 to 12
Multiplexing for PMT signal digitization
CAMAC/NIM System
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Either1. Digital scope with GPIB2. PCI card with 100 MHz
digitizer Both require multiplexing
Pulse Shape
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Automated analysis1. Yes/no/maybe?2. Linearity curve3. Gain/Dark Rate vs HV4. Pulse shapes
Archive plots and complete data tables using HTML interface
Root macros to read data
Analysis and Archiving
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On-Site Work
Clear sky
High elevation
Plateau
Fluorescence detector
September 2000
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On-Site Progress
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On-Site Progress
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On-Site Goals
Test over-wintered tank Number of pe per muon
Learn electronics/DAQ Requirements for PMT
tests Contribute to site
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Prototype Tank
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Muons in Tank
PMT 1 PMT 2
PMT 3
10 mV per division
100 ns per division
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Muons in Tank
Gain = 106
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Average Muon Pulse
12 m atten length
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Low Gain (105)1. Amplify last dynode for
small signals2. Use anode for large
signals High Gain (106)
1. Anode for small signals2. Deep dynode for large
signals
Gain???
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Back at UCLA… Tap dynode 8 of 12 of ETL
PMT The signals look beautiful
Deep Dynode Tap
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Deep Dynode Tap
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Linearity Still Not There
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Run at about 2105 gain PMT test stand designed
PMT test stand to be built Contribution to site Energy calibration
Conclusions