UK ATLAS SCT Module Quality Assurance

Joe Foster, Manchester University

04 Jan 2005All results compiled in time for Christmas…

Last year I …

• Was responsible for quality assurance on all UK SCT endcap modules.

• Helped refine module acceptance criteria.• Ran web pages of current UK module statistics.• Examined and evaluated detailed test histories of 364

modules. • Chased missing test result, hidden problems,

database funnies, unexplained failures, etc.• Was an officially sanctioned grumpy old man.

Next Year I’ll…

• Carry on with UK endcap module QA.• Examine another 250 or so module test histories in

detail.• Further refine acceptance criteria to ensure we have

enough modules of the right sort.• Maybe move to integration of SCT in ATLAS.• Do some e-Science.• Increase my rating to ‘grouch’?

Aims of Module QA

• Monitor each step of module production.• Continuous health check on each module.• Monitor overall production rates, yields, etc.• Provide complete history of each module.• Select the best modules for assembly in SCT.• Pass module parameters on to reconstruction and

simulation.

Module QA Tools

• Production Database:– Current location and status of every SCT component.– Complete test history of of each component.– Shipping history of each component.– Complete assembly ‘family tree’.– Accessible world wide.

• Module ‘traveler’ and visual inspection sheets.• Locally archived test results.• Scanned images of assembled modules.• Personal notes from meetings, emails, etc.

UK Module Production Rates

UK Modules Started

Yield of Good + Pass UK Modules

Leakage Current, All UK Modules

RC Defects, All UK Modules

Noise Occupancy, All UK Modules

Midyf, All UK Modules

Midyf vs Midxf, All UK Modules

Msy vs. Mhy

Zmax, Zmin Front, All UK Modules

Zmax, Zmin Back, All UK Modules

Zminf vs. Zminb, All UK Modules

Time to Complete UK Module Testing

Failure ModesFailure Mode Outers Middles Inners

Broken bits 7 2 0

IV 5 1 0

No HV bias 1 1 0

RC defects 7 0 1

Noise Occupancy

2 1 0

Trim (1) 0 0

XY survey 4 1 5

Z survey 2 0 0

Misc. 1 0 0

UK XY/Z Survey Parameters out of Spec.

Parameter Pass Outside Pass

Mhy 4 1

Msx 0 1

Msy 3 0

Midyf 8 4

Sepf 0 1

Sepb 0 3

Zminf 9 0

Zminb 3 0

Zmaxf 1 0

Recoverable Modules

Rework Modules

Redefine ‘Pass’ 20220240100158, 208, 211, 365, 407(?)

Repair Bonds 20220240100043, 144, 381(?), 392(?)

Replace Chip 20220240100082, 083, 095, 195, 210, 237, 402

Others 20220240100119, 320(?)

Could recover ~5 modules by extending Pass spec.Up to 7 could be recovered by chip replacement.

Module Summary

Type StartsUnder

Test, OKEval

Good + Pass

Yield

Outer 250 16 231 204 0.88

Long

Middle123 1 122 116 0.95

Inner 79 61 10 8 0.80

Four inners fail ‘pass’ cuts due to jig teething problems.

Conclusions

• Good module QA information.• Good QA information on production processes.• UK should meet commitments on number and quality

of modules.