production pmt testing and work on site with prototype tank university of california, los angles...

26
Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy [email protected] Chris Jillings Chris Jillings November, 2000

Upload: jennifer-dorsey

Post on 06-Jan-2018

213 views

Category:

Documents


0 download

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

Page 1: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Production PMT Testing and Work

on Site with Prototype Tank

University of California, Los AnglesDepartment of Physics and

[email protected]

Chris JillingsChris Jillings

November, 2000

Page 2: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Production PMT testing1. Requirements2. Light source3. Electronics and DAQ

Prototype tank (Sept 2000) Low gain or high gain

Talk Outline

Page 3: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

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…

Page 4: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

48 PMTs in one day Measure

1. Linearity2. Gain / Dark rate vs voltage3. Pulse shape4. Afterpulsing

Production PMT Testing

Page 5: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

The Lab in the STRB

Page 6: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Schematic

Page 7: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Overview

Page 8: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Need 1% stability for linearity

Timing on 25 ns scale Wide range of brightness

Light Source

Blue LEDBlue LED

Page 9: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

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

Page 10: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

High Voltage Standard system (CAEN SY403) HV supply on the base

Needs 5V for powerAnalog level to control HV

Page 11: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

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

Page 12: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Either1. Digital scope with GPIB2. PCI card with 100 MHz

digitizer Both require multiplexing

Pulse Shape

Page 13: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

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

Page 14: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

On-Site Work

Clear sky

High elevation

Plateau

Fluorescence detector

September 2000

Page 15: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

On-Site Progress

Page 16: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

On-Site Progress

Page 17: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

On-Site Goals

Test over-wintered tank Number of pe per muon

Learn electronics/DAQ Requirements for PMT

tests Contribute to site

Page 18: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Prototype Tank

Page 19: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Muons in Tank

PMT 1 PMT 2

PMT 3

10 mV per division

100 ns per division

Page 20: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Muons in Tank

Gain = 106

Page 21: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Average Muon Pulse

12 m atten length

Page 22: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

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???

Page 23: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Back at UCLA… Tap dynode 8 of 12 of ETL

PMT The signals look beautiful

Deep Dynode Tap

Page 24: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Deep Dynode Tap

Page 25: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Linearity Still Not There

Page 26: Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy

Run at about 2105 gain PMT test stand designed

PMT test stand to be built Contribution to site Energy calibration

Conclusions