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FNAL Hybrid Thermal Test StatusFNAL Hybrid Thermal Test Status

Hybrid Thermal Test Procedure

Test Results

Eva MedelEva MedelFNAL CMS Group

June 22, 2004June 22, 2004

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Hybrid Thermal TestHybrid Thermal Test

Test ProcedureTest ProcedureWe follow exactly the 4 Hybrid Thermal Test Procedure;basically:

I. Pre-LoadingTurn the chiller on,activate ACDC, NIM crate and peltier power supply power on.

II. LoadingLoad 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, orFive or more noisy or open channels.

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Hybrid Thermal TestHybrid Thermal Test

Test ProcedureTest 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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ResultsResults

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 TestHybrid Thermal Test

ResultsResults

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 TestHybrid 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 TestHybrid 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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TEC HYBRIDSExample of short and noisy channels

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TEC HYBRIDS

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TEC HYBRIDSResults

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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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 TestHybrid 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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TOB HYBRIDSA hybrid without problems (peddecon_file 1)

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TOB HYBRIDSA hybrid without problems (peddecon_file 2)

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TOB HYBRIDSA hybrid without problems (peddecon_file 3)

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TOB HYBRIDS