FNAL Hybrid Thermal Test Status

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FNAL Hybrid Thermal Test Status

• Hybrid Thermal Test Procedure
• Test Results
• Eva Medel
• FNAL CMS Group
• June 22, 2004

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Hybrid Thermal Test

• Test Procedure
• We follow exactly the 4 Hybrid Thermal Test
  Procedurebasically
• I. Pre-Loading
• Turn the chiller on,activate ACDC, NIM crate and
  peltier power supply power on.
• II. Loading
• Load the hybrids onto the peltier plate. Hybrid
  registration. Turn on ARC Board power supplies.
  Initialization in testation_start.vi.
• III. Testing (failures)
• One or more shorted channels, or
• Five or more noisy or open channels.

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Hybrid Thermal Test

• Test Procedure
• After the test, an automatic report is generated
  for each hybrid in
• teststation_final_report.vi
• xml files generated and saved in the same
  directories, ( e.g. C\TrakerDB\results).
• Uploading of the xml files into the data base
  when the program arcs_auto.xml.exe is run.

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Hybrid Thermal Test

• Results
• 430 TEC hybrids have been tested
• 69 TEC hybrids failed the thermal test ( 16 ) 
• 361 passed the test ( 84 )
• Hybrids that failed
•  44 showed at 20 PLL failure.
• 25 for other reasons

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Hybrid Thermal Test

• Results
• 210 TOB hybrids have been tested
• 29 TOB hybrids failed the thermal test ( 14 ) 
• 181 passed the test ( 86 )
• Hybrids that failed
•  24 showed at 20 PLL failure.
• 5 for other reasons

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Hybrid Thermal Test

• TEC HYBRIDS
• Failure at 200C.
• 22 do not present any apparent damage. The
  rest show certain damage mainly done during the
  wire-bonding like
• OUTER BONDS REPAIRS
• NEW WIRE, NEW TOOL, PROGRAM MODE-SOFTWARE
  UPGRADES
• IRREGULAR LOOP HEIGHTS
• Or problems due to PA dirty, scratched or bad
  chips.
•  

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Hybrid Thermal Test

• TEC HYBRIDS
• For failed hybrids ( except 20 PLL failure)
  we used Lance s Labview program to know how
  noisy is an APV, ploting the noise and pedestal
  vs channel.
• This tool allow us to determine short channels.
  The cut applied on the calibration signal height
  was 1.7 ADC counts. Short channels due to the
  wire bonding.
• To determine open channels we analyze the
  pedestal distribution expecting a smooth
  spectrum. Open channels are attributed to open
  bonds and PA damages.
• A visual inspection, clean some hybrids and
  retest were done.

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Hybrid Thermal Test

• TEC HYBRIDS
• Example of short and noisy channels

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Hybrid Thermal Test

• TEC HYBRIDS

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Hybrid Thermal Test

• TEC HYBRIDS
• Results
• Using Lance s program we found less short
  channels than reported.
• Noisy channels are consistent with the reported
  ones.
• Visual inspection was done and then some hybrids
  were retested. The majority failed for the same
  reason than the first time, ( no visible
  problem).
• 83 of the failed are 6 chip hybrids. The number
  of short channels should not be the same for 4
  and 6 chip hybrids.

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Hybrid Thermal Test

• TOB HYBRIDS
• 29 TOB hybrids that failed the thermal test
•  
• 25 showed at 20 PLL failure
• For the rest of the TOB hybrids (4) an analysis
  using Lance s program was done, and visual
  inspection trying to fix something.  

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Hybrid Thermal Test

• TOB HYBRIDS
• Failure at 200C.
• 10 do not present any apparent damage. The
  rest show certain damage on the pitch adapter
  mainly
• SCRATCHES ON PA
• BAD SURFACE (bond pads,1)

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Hybrid Thermal Test

• TOB HYBRIDS
• A hybrid without problems (peddecon_file 1)

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Hybrid Thermal Test

• TOB HYBRIDS
• A hybrid without problems (peddecon_file 2)

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Hybrid Thermal Test

• TOB HYBRIDS
• A hybrid without problems (peddecon_file 3)

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Hybrid Thermal Test

• TOB HYBRIDS