Status and Plans for the Photodetector Test Facilities

1
Status and Plans for thePhotodetector Test
Facilities

• Aims and Strategy
• Test Program
• DAQ System
• Infrastructure / Photo Gallery
• Software / Screenshots
• Conclusions

Stephan Eisenhardt University of Edinburgh
HPD PRR meeting, CERN, 15.12.2004
2
Aims and Strategy

• verify specs of 550 HPD tubes and characterise
  them for selection over 1½ years (330 work days)
• delivery batches of 30 HPD per month
• 8 weeks from delivery to accept/reject tubes
• Photo Detector Test Facilities (PDTF)
• two sites Glasgow Edinburgh
• test one HPD / work day / site (i.e. 40 HPD/month
  possible)
• two test stations per site (i.e. 4 DAQ chains in
  total)
• one test station/site for mandatory tests to
  accept/reject tubes
• second test station/site for extra
  characterisation and redundancy
• automation mandatory

3
Test Program

• Mandatory tests (one test station / site)
• mechanics (sizes and tolerances)
• pixel chip register check DAC linearity scan
• threshold working point, scans, TP noise
  threshold maps
• DAQ timing
• LED test dead pixel map, sensor position,
  demagnification
• HV scan gain curve
• Bias V scan depletion IV-curve
• dark count rate ion feed back rate

4
2nd Test Station

• Extra characterisation (on subset of HPDs)
• Photoelectron efficiency test with backpulse
  measurement
• Quantum Efficiency test with Sr90 source
• electron optics distortion map
• Additional studies (on subset of HPDs)
• swap tubes between sites and re-test for
  cross-check
• re-measure for long-term stability
• Redundancy
• immediate spare if first test station fails
• parallel mandatory tests, if we have to catch up
  with schedule

5
DAQ System

• based on CERN HPD DAQ system
• same system as used for chip testing
• hardware status
• 4 full DAQ chains
• 2 spares for custom electronics
• only 4 FLIC cards (potential bottle neck)
• all tested OK
• missing HV divider/terminal HPD prototypes
• shipping1st week of Jan 05
• improved automation
• no more hand-steered/recorded parameters
• Silicon Bias Voltage steering
• Silicon Bias current read back
• LED delay setting wrt. DAQ clock
• Temperature monitors

6
Infrastructure

• 1st set of mech. setups finished
• arrangement fits on one laboratory table
  (excluding DAQ PC)
• usable for prototype and production HPDs
• 3 more sets in production
• available in Feb 05
• usable only for production HPDs
• electronics HPD training sessions at CERN
• attended by Edinburgh Glasgow physicists
• test programme will be shared between 3
  people/site
• physicists technicians
• HPD storage
• in DEP boxes plastic bags under N2 atmosphere
• shipment
• from DEP to Edinburgh, Glasgow CERN possible

7
Photo Gallery
LED trigger
bias pick-up
fibre
HV supply
LED pulse
HV divider
pA meter
I/O
bias supply
MB/FB supply
dark box
HPD
PP JTAG
flat pointing light source
to ZIF board
MB FB
PCI bus
8
Software

• DAQ PC setup complete (4PCs)
• Win XP, service applications, HW drivers,
  Labview installed and tested
• PDTF software package
• adoption of PTS software to our setup done
  (readout of chip on ZIF board)
• PTS software runs now also with parallel port
  JTAG interface done
• stand-alone steering of Matsusada HV supply,
  PT100 temperature sensors,
• LED delay done
• steering of bias supply, read-back of pA meter
  works stand-alone, VI in development
• integration under top level VI work in progress
• test programme separated into tasks
• automated logging of tasks, steering parameters
  results
• automated task flow with flexibility to divert
• self-restoring monitors (HV, Bias V, T)

9
Screen Shots
PDTF_control.vi
T_sensors.vi
LHCb_PTS.vi
DAQ software
top level task flow
permanent monitor
10
Conclusions

• setup of photodetector test facilities at
  Edinburgh and Glasgow is well underway
• 1 DAQ chain is operational
• (prototype HPD and HV divider missing)
• 4 working DAQ chains are expected by Feb/05
• data acquisition software (PTS) and stand-alone
  software is working
• further software integration for automated test
  programme underway, to be finished in Mar/05