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Production and Quality Assurance of Main Busbar Interconnection Splices during the LHC 2008-2009 Shutdown.

The main busbar interconnection splices of the Large Hadron Collider are assembled by inductive soldering of the Rutherford type cables and the copper profiles of the stabilizer. Following the September 2008 incident, the assembly process and the quality assurance have been improved, with new measur...

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Autores principales: Bertinelli, F, Bottura, L, Dalin, J-M, Fessia, P, Flora, R H, Heck, S, Pfeffer, H, Prin, H, Scheuerlein, C, Thonet, P, Tock, J-P, Williams, L
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:https://dx.doi.org/10.1109/TASC.2010.2085072
http://cds.cern.ch/record/1379836
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author Bertinelli, F
Bottura, L
Dalin, J-M
Fessia, P
Flora, R H
Heck, S
Pfeffer, H
Prin, H
Scheuerlein, C
Thonet, P
Tock, J-P
Williams, L
author_facet Bertinelli, F
Bottura, L
Dalin, J-M
Fessia, P
Flora, R H
Heck, S
Pfeffer, H
Prin, H
Scheuerlein, C
Thonet, P
Tock, J-P
Williams, L
author_sort Bertinelli, F
collection CERN
description The main busbar interconnection splices of the Large Hadron Collider are assembled by inductive soldering of the Rutherford type cables and the copper profiles of the stabilizer. Following the September 2008 incident, the assembly process and the quality assurance have been improved, with new measurement and diagnostics methods introduced. In the 2008-2009 shutdown the resistance both in the superconducting and in the normal conducting states have been the focus for improvements. The introduction of gamma radiography has allowed the visualization of voids between cable and stabilizer. It is now known that during the standard soldering heating cycle solder is lost from the busbar extremities adjacent to the splice profiles, leaving parts of the cable in poor contact with the stabilizer. A room temperature resistance measurement has been introduced as a simple, non-destructive test to measure the electrical continuity of the splice in its normal conducting state. An ultrasonic test has been performed systematically in order to verify if the vertical gaps between the splice profiles are filled with Sn96Ag4 solder. Visual inspections of the different splice components before and after interconnection have been reinforced. The additional information gained has allowed targeted improvements in the splice production process. Ad-hoc machining of splice components avoids macroscopic gaps, additional soldering foil and copper shims are used in critical areas in order to improve the cable to stabilizer contact.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2011
record_format invenio
spelling cern-13798362019-09-30T06:29:59Zdoi:10.1109/TASC.2010.2085072http://cds.cern.ch/record/1379836engBertinelli, FBottura, LDalin, J-MFessia, PFlora, R HHeck, SPfeffer, HPrin, HScheuerlein, CThonet, PTock, J-PWilliams, LProduction and Quality Assurance of Main Busbar Interconnection Splices during the LHC 2008-2009 Shutdown.Accelerators and Storage RingsThe main busbar interconnection splices of the Large Hadron Collider are assembled by inductive soldering of the Rutherford type cables and the copper profiles of the stabilizer. Following the September 2008 incident, the assembly process and the quality assurance have been improved, with new measurement and diagnostics methods introduced. In the 2008-2009 shutdown the resistance both in the superconducting and in the normal conducting states have been the focus for improvements. The introduction of gamma radiography has allowed the visualization of voids between cable and stabilizer. It is now known that during the standard soldering heating cycle solder is lost from the busbar extremities adjacent to the splice profiles, leaving parts of the cable in poor contact with the stabilizer. A room temperature resistance measurement has been introduced as a simple, non-destructive test to measure the electrical continuity of the splice in its normal conducting state. An ultrasonic test has been performed systematically in order to verify if the vertical gaps between the splice profiles are filled with Sn96Ag4 solder. Visual inspections of the different splice components before and after interconnection have been reinforced. The additional information gained has allowed targeted improvements in the splice production process. Ad-hoc machining of splice components avoids macroscopic gaps, additional soldering foil and copper shims are used in critical areas in order to improve the cable to stabilizer contact.CERN-ATS-2011-069oai:cds.cern.ch:13798362011-09-01
spellingShingle Accelerators and Storage Rings
Bertinelli, F
Bottura, L
Dalin, J-M
Fessia, P
Flora, R H
Heck, S
Pfeffer, H
Prin, H
Scheuerlein, C
Thonet, P
Tock, J-P
Williams, L
Production and Quality Assurance of Main Busbar Interconnection Splices during the LHC 2008-2009 Shutdown.
title Production and Quality Assurance of Main Busbar Interconnection Splices during the LHC 2008-2009 Shutdown.
title_full Production and Quality Assurance of Main Busbar Interconnection Splices during the LHC 2008-2009 Shutdown.
title_fullStr Production and Quality Assurance of Main Busbar Interconnection Splices during the LHC 2008-2009 Shutdown.
title_full_unstemmed Production and Quality Assurance of Main Busbar Interconnection Splices during the LHC 2008-2009 Shutdown.
title_short Production and Quality Assurance of Main Busbar Interconnection Splices during the LHC 2008-2009 Shutdown.
title_sort production and quality assurance of main busbar interconnection splices during the lhc 2008-2009 shutdown.
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1109/TASC.2010.2085072
http://cds.cern.ch/record/1379836
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