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ATLAS SCT Endcap Module Production
The challenges for the tracking detector systems at the LHC are unprecedented in terms of the number of channels, the required read-out speed and the expected radiation levels. The ATLAS Semiconductor Tracker (SCT) end-caps have a total of about 3 million electronics channels each reading out every...
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Lenguaje: | eng |
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2006
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Acceso en línea: | http://cds.cern.ch/record/973395 |
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author | Abdesselam, A |
author_facet | Abdesselam, A |
author_sort | Abdesselam, A |
collection | CERN |
description | The challenges for the tracking detector systems at the LHC are unprecedented in terms of the number of channels, the required read-out speed and the expected radiation levels. The ATLAS Semiconductor Tracker (SCT) end-caps have a total of about 3 million electronics channels each reading out every 25 ns into its own on-chip 3.3 ?s buffer. The highest anticipated dose after 10 years operation is 1.4×1014 cm-2 in units of 1 MeV neutron equivalent (assuming the damage factors scale with the non-ionising energy loss). The forward tracker has 1976 double-sided modules, mostly of area ? 70 cm2, each having 2×768 strips read out by 6 ASICs per side. The requirement to achieve an average perpendicular radiation length of 1.5% X0, while coping with up to 7 W dissipation per module (after irradiation), leads to stringent constraints on the thermal design. The additional requirement of 1500 e- equivalent noise charge (ENC) rising to only 1800 e-ENC after irradiation, provides stringent design constraints on both high-density Cu/Polyimide flex read-out circuit and the ABCD3TA read-out ASICs. Finally, the accuracy of module assembly must not compromise the 16 ?m (r-?) resolution perpendicular to the strip directions or 580 ?m radial resolution coming from the 40 mrad front-back stereo angle. 2196 modules were built to the tight tolerances and specifications required for the SCT. This was 220 more than the 1976 required and represents a yield of 93%. The component flow was at times tight, but the module production rate of 40 to 50 per week was maintained despite this. The distributed production was not found to be a major logistical problem and it allowed additional flexibility to take advantage of where the effort was available, including any spare capacity, for building the end-cap modules. The collaboration that produced the ATLAS SCT end-cap modules kept in close contact at all times so that the effects of shortages or stoppages at different sites could be rapidly resolved. |
id | cern-973395 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2006 |
record_format | invenio |
spelling | cern-9733952019-09-30T06:29:59Zhttp://cds.cern.ch/record/973395engAbdesselam, AATLAS SCT Endcap Module ProductionDetectors and Experimental TechniquesThe challenges for the tracking detector systems at the LHC are unprecedented in terms of the number of channels, the required read-out speed and the expected radiation levels. The ATLAS Semiconductor Tracker (SCT) end-caps have a total of about 3 million electronics channels each reading out every 25 ns into its own on-chip 3.3 ?s buffer. The highest anticipated dose after 10 years operation is 1.4×1014 cm-2 in units of 1 MeV neutron equivalent (assuming the damage factors scale with the non-ionising energy loss). The forward tracker has 1976 double-sided modules, mostly of area ? 70 cm2, each having 2×768 strips read out by 6 ASICs per side. The requirement to achieve an average perpendicular radiation length of 1.5% X0, while coping with up to 7 W dissipation per module (after irradiation), leads to stringent constraints on the thermal design. The additional requirement of 1500 e- equivalent noise charge (ENC) rising to only 1800 e-ENC after irradiation, provides stringent design constraints on both high-density Cu/Polyimide flex read-out circuit and the ABCD3TA read-out ASICs. Finally, the accuracy of module assembly must not compromise the 16 ?m (r-?) resolution perpendicular to the strip directions or 580 ?m radial resolution coming from the 40 mrad front-back stereo angle. 2196 modules were built to the tight tolerances and specifications required for the SCT. This was 220 more than the 1976 required and represents a yield of 93%. The component flow was at times tight, but the module production rate of 40 to 50 per week was maintained despite this. The distributed production was not found to be a major logistical problem and it allowed additional flexibility to take advantage of where the effort was available, including any spare capacity, for building the end-cap modules. The collaboration that produced the ATLAS SCT end-cap modules kept in close contact at all times so that the effects of shortages or stoppages at different sites could be rapidly resolved.ATL-INDET-PUB-2006-007ATL-COM-INDET-2006-008oai:cds.cern.ch:9733952006-07-20 |
spellingShingle | Detectors and Experimental Techniques Abdesselam, A ATLAS SCT Endcap Module Production |
title | ATLAS SCT Endcap Module Production |
title_full | ATLAS SCT Endcap Module Production |
title_fullStr | ATLAS SCT Endcap Module Production |
title_full_unstemmed | ATLAS SCT Endcap Module Production |
title_short | ATLAS SCT Endcap Module Production |
title_sort | atlas sct endcap module production |
topic | Detectors and Experimental Techniques |
url | http://cds.cern.ch/record/973395 |
work_keys_str_mv | AT abdesselama atlassctendcapmoduleproduction |