October 05, 2005 D. Ferrère, RD05 Florence 1 From the ATLAS SCT endcap module production to the commisionning D. Ferrère, University of Geneva in behalf of the ATLAS SCT collaboration Overview: Overview: Introduction of SCT Introduction of SCT The endcap modules and the The endcap modules and the specifications specifications The module production and logistics The module production and logistics Production results: yield and Production results: yield and statistics statistics The endcap macro-assembly: status and The endcap macro-assembly: status and results results The integration and commissioning The integration and commissioning
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October 05, 2005D. Ferrère, RD05 Florence1 From the ATLAS SCT endcap module production to the commisionning D. Ferrère, University of Geneva in behalf.
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October 05, 2005 D. Ferrère, RD05 Florence 1
From the ATLAS SCT endcap module production to the
commisionningD. Ferrère, University of Geneva
in behalf of the ATLAS SCT collaboration
Overview:Overview: Introduction of SCT Introduction of SCT The endcap modules and the specificationsThe endcap modules and the specifications The module production and logisticsThe module production and logistics Production results: yield and statisticsProduction results: yield and statistics The endcap macro-assembly: status and resultsThe endcap macro-assembly: status and results The integration and commissioning The integration and commissioning
A module consists of 768 readout strips on each side with a constant angular pitch pointing towards the center of the wheel. Pitch between 70 to 90 m.
Middle short Middle short
October 05, 2005 D. Ferrère, RD05 Florence 5
Expanded view of an outer moduleExpanded view of an outer module
2 detectors strip-chained and readout at one end by 6 binary chips (ABCD3T) on each side 768 readout strips per side.
Clock, control and signal are transmitted optically.Detectors are mounted back to back with a 20 mrad stereo angle.
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Module requirementsModule requirementsElectrical specifications:(Based on a full set of digital/analog chip characterization + bias tests)
• Noise occupancy at 1 fC less than 5x10-4 also related to the input noise• Less than 1 % dead channels ( 15/1536 ) – From the response curve test• Detector current less than 20 A at 350V per detector.• Long Term Test (LTT) operation for 18-24 hours cold:
> thermistor on hottest part of hybrid at ~10 ºC > Chip and detector biases and currents should remain stable
top side
bottom side
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Module requirementsModule requirementsMechanical specifications:• XY alignment - 13 parameters defined but critical are
– Front-to-back detector alignment: midYF within ± 5 m– Individual detector angles: a1 to a4 within ± 130 mrad– Mounting hole and slot alignment: mhx, mhy and msy within ± 20 m
• Z detector profile – 50 points are focused on the Si-detectors and per module side. None of them should exceed ± 115 m envelope.
• Chip and fanins must be assembled within a defined envelope to avoid clashes with neighbor modules
• The alignment and the profile must survive 10 thermal cycles between +35 ºC down to –30 ºC
• Ceramic mounting surface should be clear of cracks (very fragile part)
13 XY alignment parameters 50 Z focus points for the module profile
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Module production and endcap flow diagram Module production and endcap flow diagram
Module Productionand QA Cluster
Com
plete
Fanin production(CNM Barcelona)
Spine Production(Protvino)
Hybrids(Cicorel + Freiburg)
Others: Washers, glue
EndCap C macro-assembly Liverpool (UK)
EndCap A macro-assembly
Nikhef (NL)
In progress ...
Hybrid QA Site
Spine QA & rework(CERN)
ID InstallationCERN ATLAS pit
May/June 2006
ID IntegrationTests and cosmic run
CERN SR1
January 2006 March 2006
Si-Detectors(Hamamatsu & CiS)
• Cracow INP• Freiburg Univ.• CLRC, RAL
• Freiburg Univ.• Geneva Univ. CERN• Manchester Univ. Liverpool,
Module assembly resourcesModule assembly resources- 7 assembly sites in total involving 12 institutes or Universities - Up to 6 technicians/site (~3 FTE) for the module assembly - Up to ~8 physicists and PhD per site (~2 FTE) for the module QA
- Component selection and reception tests ~2h- Alignment and assembly of detectors ~2h + 24h glue curing- Detector current check and visual inspection ~40min- Assembly with hybrids and fanins ~1h30 + 24h glue curing- Wire bonding ~3h- Detector current check and visual inspection ~15min- Metrology survey ~30min- Thermal cycling ~18h- Metrology survey ~30min- Electrical characterization ~2h30- Long Term Test electrical characterization ~24h- Inspection and packing for storage ~20min
From start to the end a module fabrication takes ~9 working days/module!
In practice a module is issued after 3 to 4 weeks!
Endcap C (Liverpool):• Module to disc completed and tested• Discs 9 to 5 in cylinder• FSI to mount on discs 1 to 4• Service to cylinder started: cooling, LMT, fibers, DCS
Delivery to CERN in January 06
Endcap A (Nikhef):• Module to disc completed from 9 to 5• Disks 9 to 7 in cylinder• Disk 5 under test• Modules to be mounted on disc 4 • Services to discs on disc 1 & 3 to do• Services to cylinder started: cooling, LMT, fibers, DCS
Delivery to CERN in March 06
EC-C cylinder with discs 6 to 9 at LiverpoolEC-C cylinder with discs 6 to 9 at Liverpool
EC-A Disk 8A inserted into cylinder at NikhefEC-A Disk 8A inserted into cylinder at Nikhef
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Integration and commissioning at CERN SR1Integration and commissioning at CERN SR1
1. The 2 ECs will arrive at CERN in January 06 and March 062. Reception tests: visual inspection, leak test and electrical
tests3. Final SCT assembly4. Integration with TRT5. Combined tests SCT/TRT - 9 SCT discs will be tested together
on 1 sector 6. Installation into the pit foreseen in May and June 06
Cantilever stand with 1 endcapCantilever stand with 1 endcap TRT trolley in aligned positionTRT trolley in aligned positionfor the integrationfor the integration
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ConclusionsConclusions
• SCT is one of the largest Si-Tracker (~61 m2).•A lot of expertise is essential from physicists, engineers and technicians in various fields such as: physics, mechanics, electronics, computing, thermodynamics,...• Even with the strict requirements, a module yield as high as 93.1% was achieved . 2377 modules have been built and 1976 will be used in SCT.• The EC module production was a great success and experience in all the assembly sites: 7 sites involving 12 universities and institutes.• Modules are completely mounted on discs for EC-C and half for EC-A and module performances are as expected!• The macro-assembly, service assembly, integration and commissioning are on the way or about to start at Liverpool, Nikhef and at CERN.• The installation into the pit is close: May 06 and June06.
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Extra slides
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23 overlapping interactions every bunch crossing (at the full Luminosity)
A bunch-bunch crossing every 25ns (40MHz)
Maximum equivalent 1 MeV neutron fluence after 10 years is ~ 2.1014 n/cm2
Operating temperature on silicon detectors is -7oC to contain the reverse annealing and the leakage current
BUT the maintenance will likely require yearly warm-up of 2 days at 20oC and 2 weeks at 17oC
Operation in a 2 Tesla solenoid field
Material < 0.4 X0 at the outer SCT envelope
SCT coverage up to =2.5
More than 99% hit efficiency is required
Running conditions and featuresRunning conditions and features
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Module componentsModule componentsHybrid: - 6 copper-kapton layers laminated onto a carbon-carbon substrate- Equipped with 12 ABCT3T readout chips and opto-chips for clock/control and readout
Detectors:- 5 detector types made in 4 inch wafers by 2 manufacturer (Hamamatsu and CiS)- 770 strips (1st and last not readout) of 20 micron width with an average pitch of ~80 m
Fanins:- Aluminum strips on glass used for electrical connection and thermal isolation
between hybrid and detectors. Different sets for the 3 module types.- 4 items per module: 2 left and 2 rightsSpine:- Made of TPG (Thermal Pyrolytic Graphite) for the excellent thermal conductivity
and AlN ceramic pieces for the mechanical stiffness. All in one single item during the module assembly.
Location pads:- very precise hole and slot made on an Aluminium washer and glue onto FR4
piece. The slot washer is glued on the spine and the hole is overlapping the hybrid and the spine.
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SCT production Database Oracle DB (kernel 9i)
Why?• Traceability of the items, shipped items, assemblies and tests that had been made• Most of the relevant test data and parameters were stored in structured way otherwise stored in raw data• Useful GUI has been made either for upload or report thanks to:
– Java applications for massive data upload– Web interfaces (SQL form) for individual data access or report– Java or other applications coupled with root display for statistics and reports
• Encourages auto-discipline. Data transparent to all the collaboration and DB entries were one of the requirements to be qualified for the module production.
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0.00001
0.0001
0.001
0.01
0.1
1
10
100
1000
10000
0 2 4 6 8 10 12 14 16 18 20Time (h)
Mo
nit
ore
d v
alu
esTemp (degC)
Icc (mA)
Idd (mA)
Idet (microA)
Noise Occupancy
Electrical QA results Electrical QA results
Long Term Test (LTT)After some stats decreased from 24h to 18h duration
Very rare problems found with the modules (0.05%)!In principles problems are detected earlier during hybrid LTT.