UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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K5 Module Performance at Liverpool

K5-300 Middle Module was evaluated at Liverpool, Dec 2001- Jan 2002

2 test configurations (within a Faraday cage):

Module mounted on a ‘Vertical Cooling Frame’ Module mounted within a ‘Valencia Cooling Box’

For both configurations the Module was evaluated with the Shunt Shield implemented at the cooling block (default) and then with this Shunt Shield ‘partially’ bypassed (see later).

There is no Shunt Shield on the TPG Spine(?)

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Tests and Results

For both set-ups:

Cooling block Shunt shield is implemented by adding a 0.12mm Thermal Pad between the module and cooling block.

‘By-passing’ of this Shunt Shield is achieved by mounting the module directly onto the cooling block without the Thermal Pad. One Caveat is that the ‘low impedance’ connection necessary between the cooling block and the hybrid AGND is via a Cu trace on the hybrid to the power connector…..this may compromise module performance.

Detector Bias = 100V, Coolant temperature ~ 12°C/13°C

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Module Mounted on Vertical Cooling Frame

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Vertical Cooling Frame Module Response

Cooling Block Shunt Shield in. Module trimmed at 1fC, Trim range 0

Link 0

Gain = 50.7mV/fCInput Noise = 1507e

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Vertical Cooling Frame Module Response

Cooling Block Shunt Shield in. Module trimmed at 1fC, Trim range 0

Link 1

Gain = 52.6mV/fCInput Noise = 1436e

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Vertical Cooling Frame Module Response

Cooling Block Shunt Shield bypassed. Module trimmed at 1fC, Trim range 0

Link 0

Gain = 51.02mV/fCInput Noise = 1486e

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Vertical Cooling Frame Module Response

Cooling Block Shunt Shield bypassed. Module trimmed at 1fC, Trim range 0

Link 1

Gain = 54.8mV/fCInput Noise = 1415e

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Vertical Cooling Frame Module Noise Occupancy

• Noise Occupancy with Shunt Shield • Noise Occupancy without Shunt Shield

• The 0fC and 1fC thresholds are 55mV and 101mV respectively.

• In both cases some chips show instability at ~ 50mV threshold. Instability is most evident on those chips adjacent to the Support Card!

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Vertical Cooling Frame Module Noise Occupancy

• Typical Noise Occupancy Scurves (without the Shunt Shield) showing instability.

• Scurves have similar structure with/without the Shunt Shield.

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Module Noise Occupancy Results from CERN

• Noise Occupancy without Shunt Shield • Associated Scurves

• Similar results obtained with the Shunt Shield.

• Scurves show no instability! Why?

• Main(?) difference could be that the module is mounted in a hermetically sealed box!

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Vertical Cooling Frame Summary

Module Input Noise < 1500e with Gain >50mV/fC

>10 channels untrimmable at 1fC, trim range 0

Module Temperature 39°C (35°C)1 for coolant temperature ~ 13°C

BUT Noise Occupancy in both cases is not good. Module exhibits instability at ~0fC threshold…….maybe to be expected?

Module could be sensitive to the environment……so change test set-up to be similar to that at CERN.

1. Temperature in brackets is that for the module mounted directly onto the cooling block.

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Module Mounted in Valencia Cooling Box

Use Valencia Cooling Box (hermetically sealed) and also screen the Support Card with Al foil.

Module trimmed at 1fC but Trim range 1…..to maximise the number of trimmed channels.

Impatient……so do Noise Occupancy first to check module stability!

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Module Mounted in Valencia Cooling Box

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Valencia Cooling Box Module Noise Occupancy

• Noise Occupancy with Shunt Shield • Noise Occupancy without Shunt Shield

• The 0fC and 1fC thresholds are 81mV and 127mV respectively.

• No obvious instability!!!

• Noise Occupancy <1x10-4 for both cases, Shunt Shield has lower occupancy BUT shows a slight deviation at 0.4fC. Chips adjacent to the Support Card appear to be the problem.

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Valencia Cooling Box Module Noise Occupancy

• Typical Noise Occupancy Scurves (without the Shunt Shield).

• Scurves have similar structure with/without the Shunt Shield.

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Valencia Cooling Box Module Response

• Module Response with Shunt Shield • Module Response without Shunt Shield

• Module Response for both cases is very similar, as the plots show above for the Gain and Input Noise etc. for Link 0.

UK-V Cluster Meeting @ RAL 30/01/02 (K5 Module Performance)

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Valencia Cooling Box Summary

Module Input Noise < 1500e with Gain >50mV/fC

All but 2 channels trimmable at 1fC, trim range 1

Module is stable with Noise Occupancy <1x10-4 ,compare with 1x10-5 for the CERN measurements……but maybe ok

But module still appears sensitive to external pickup e.g. Shunt Shield Noise Occupancy showing deviation at 0.4fC.

Module Temperature 38°C for coolant temperature ~ 12°C

Working module.…maybe? Evaluate at system-test.