Long Term Rod Testing in US

1
Long Term Rod Testing in US

• Patrick Gartung
• University of California, Riverside

2
Rod Acceptance Testing

• No electrical test done yet
• To readout frames you need to attach/detach
  hybrid
• Following example of TEC
• Rod is powered and connected to FEC
• I2C commands sent to optohybird to vary gain and
  bias
• Laser output is checked on oscilloscope

• Rod is unpacked and visually inspected for damage
  then placed in the assembly fixture

3
Module installation testing

• Rod is powered and connected to DAQ
• The rod is biased and noise and calibration
  measurements are made to determine if any bonds
  were broken (as indicated by low noise and
  calibration response).
• Modules with broken bonds are replaced and the
  rod is retested.
• For double sided rods test after inner 6 modules
  are installed then install outer 6

• Modules are installed in the rod

4
Long Term Testing

• Rods are placed in test box, connected to the
  chiller, powered and connected to DAQ
• Rods are biased and thermal cycled for several
  days
• Periodic measurements are made with test software
  to determine any failures
• Chiller is controlled by independent interlock
  system which can communicate with test software
  on DAQ system.

5
Single Rod Test Stand
OEC (12 channels)
DAQ PC with 2 FED
CTRL adapter and cables
Cold box with dry air
chiller
High voltage (36 channels)
Low voltage

• Work done by Jim Lamb (UCSB student)
• Readout 1 SS or DS rod
• Prototype set up at UCSB
• Currently using XROD to take pedestals
• Will thermal cycle rod with chiller control

6
Multi-rod test stand status

• Prototype freezer moved from Rochester to
  Fermilab October 11.
• Second freezer will be shipped to UCSB early
  December.
• Designed and built an electronic circuit to
  command the coolant, vacuum and compressed air
  valves
• Allows a low current signal to completely control
  flow of coolant and the application of compressed
  air and vacuum
• Completed the automation of the procedure for
  loading and unloading of rods
• Work done by Ricardo Eusebi (Rochester student)
• Labview VI running on interlock PC will guide
  user
• User selects install rods and PC sets freezer
  in proper condition
• PC closes coolant valves and drains pipes
• User is prompted to install rods and click
  continue
• PC opens coolant valves and fills pipes
• After long term test user will select remove
  rods and the reverse procedure will be followed.
  

7
Assembly diagnostic software

• Currently using XROD
• Quickly determine optohybrid gain and bias
  settings, FED timing and PLL timing
• Perform quick noise measurements to check for
  opens

8
Long term test software

• Lt is being extended to test modules on
  substructures
• Working with Wim Beamont to define settings for
  rods
• Will beta test on rod in the next few weeks
• Chiller control system listens on TCP port for
  set temperature commands from Lt
• Ability to read and record temperatures and
  currents for free
• Scripting of temperature change, voltage change
  and various tests for free

9
Equipment needs

• To complete two single rod test stands
• Need 1 TSC, 2 OEC (2nd OEC on motherboard)
• 2 OMUX crates with 4 mux cards each
• (Optional) 4 electrometers
• Short term for multi-rod test stands
• 2 TSC, 2 FED, 2 FEC
• 2 OMUX crates with 4 mux cards each
• 4 OEC on 2 motherboards
• 2 CERN low voltage power supplies