A Correlation Study Between Geometry of Collared Coils and Normal Quadrupole Multipole in the Main LHC Dipoles
The quality control implemented at all LHC dipole assemblers includes precise mechanical measurements of the geometry of collared coils. A cross-analysis performed between mechanical and magnetic measurements data shows a correlation between collared coils outer dimensions and the normal quadrupole...
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| Veröffentlicht in: | IEEE transactions on applied superconductivity 2006-06, Vol.16 (2), p.192-195 |
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| container_title | IEEE transactions on applied superconductivity |
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| creator | Bertinelli, F. Boter-Rebollo, E. Berthollon-Vitte, S. Glaude, D. Vanenkov, I. |
| description | The quality control implemented at all LHC dipole assemblers includes precise mechanical measurements of the geometry of collared coils. A cross-analysis performed between mechanical and magnetic measurements data shows a correlation between collared coils outer dimensions and the normal quadrupole multipole (b 2 ) for one dipole assembler. The profile geometry of the single collars-as determined from 3D measurements at the collar suppliers and CERN-could not account alone for the significant left-right aperture asymmetry observed. This triggered a deeper investigation on different elements of the geometry of single collars. The results of this work show that the relative positioning of the collaring holes, allowing a small bending deformation of collars under the effect of coil pre-stress, is an important effect that generates a b 2 multipole at the limit of specification. The study has deepened the understanding of the factors affecting collared coil geometry and field quality. The precision of 3D measurements at the collar suppliers and at CERN has been improved, and a tighter quality control has been introduced at the collar suppliers |
| doi_str_mv | 10.1109/TASC.2006.870498 |
| format | Article |
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A cross-analysis performed between mechanical and magnetic measurements data shows a correlation between collared coils outer dimensions and the normal quadrupole multipole (b 2 ) for one dipole assembler. The profile geometry of the single collars-as determined from 3D measurements at the collar suppliers and CERN-could not account alone for the significant left-right aperture asymmetry observed. This triggered a deeper investigation on different elements of the geometry of single collars. The results of this work show that the relative positioning of the collaring holes, allowing a small bending deformation of collars under the effect of coil pre-stress, is an important effect that generates a b 2 multipole at the limit of specification. The study has deepened the understanding of the factors affecting collared coil geometry and field quality. 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Electrical power engineering ; Electromagnets ; Exact sciences and technology ; Experimental methods and instrumentation for elementary-particle and nuclear physics ; Geometry ; Large Hadron Collider ; Magnetic field measurement ; magnetic field quality ; Magnetic variables measurement ; Mechanical variables measurement ; Multipoles ; Nuclear physics ; Performance evaluation ; Physics ; Quality control ; Studies ; superconducting magnets ; Suppliers ; Three dimensional ; Various equipment and components ; warm magnetic measurements</subject><ispartof>IEEE transactions on applied superconductivity, 2006-06, Vol.16 (2), p.192-195</ispartof><rights>2006 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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A cross-analysis performed between mechanical and magnetic measurements data shows a correlation between collared coils outer dimensions and the normal quadrupole multipole (b 2 ) for one dipole assembler. The profile geometry of the single collars-as determined from 3D measurements at the collar suppliers and CERN-could not account alone for the significant left-right aperture asymmetry observed. This triggered a deeper investigation on different elements of the geometry of single collars. The results of this work show that the relative positioning of the collaring holes, allowing a small bending deformation of collars under the effect of coil pre-stress, is an important effect that generates a b 2 multipole at the limit of specification. The study has deepened the understanding of the factors affecting collared coil geometry and field quality. 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Electrical power engineering</subject><subject>Electromagnets</subject><subject>Exact sciences and technology</subject><subject>Experimental methods and instrumentation for elementary-particle and nuclear physics</subject><subject>Geometry</subject><subject>Large Hadron Collider</subject><subject>Magnetic field measurement</subject><subject>magnetic field quality</subject><subject>Magnetic variables measurement</subject><subject>Mechanical variables measurement</subject><subject>Multipoles</subject><subject>Nuclear physics</subject><subject>Performance evaluation</subject><subject>Physics</subject><subject>Quality control</subject><subject>Studies</subject><subject>superconducting magnets</subject><subject>Suppliers</subject><subject>Three dimensional</subject><subject>Various equipment and components</subject><subject>warm magnetic measurements</subject><issn>1051-8223</issn><issn>1558-2515</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNpdkN9LwzAQx4soOKfvgi9BEJ86kzRpk8dZf0yYimw-lzS5YiVrZtIi--_NNkGQe7gvd5877r5Jck7whBAsb5bTRTmhGOcTUWAmxUEyIpyLlHLCD6PGnKSC0uw4OQnhE2PCBOOjpJui0nkPVvWt69CiH8wG3UL_DdChR3Ar6P0GuSZS1ioPJorWBqQ6g16cXymL3gZl_LB2FtDzYPt2p9oO9R-xoKKYz0p0tyuH0-SoUTbA2W8eJ-8P98tyls5fH5_K6TzVjMo-NaxWwtSU0zqDHEihjMl0Q_JGcg7xlbphpta4NpAJxhpCocay0FoSnmtZZOPker937d3XAKGvVm3QEF_owA2hkoTljGEpInn5j_x0g-_icRGiFOcZySOE95D2LgQPTbX27Ur5TUVwtbW_2tpfbe2v9vbHkavfvSpoZRuvOt2Gv7lCshg4chd7rgWAv3bOqKBZ9gOF1o3i</recordid><startdate>20060601</startdate><enddate>20060601</enddate><creator>Bertinelli, F.</creator><creator>Boter-Rebollo, E.</creator><creator>Berthollon-Vitte, S.</creator><creator>Glaude, D.</creator><creator>Vanenkov, I.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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A cross-analysis performed between mechanical and magnetic measurements data shows a correlation between collared coils outer dimensions and the normal quadrupole multipole (b 2 ) for one dipole assembler. The profile geometry of the single collars-as determined from 3D measurements at the collar suppliers and CERN-could not account alone for the significant left-right aperture asymmetry observed. This triggered a deeper investigation on different elements of the geometry of single collars. The results of this work show that the relative positioning of the collaring holes, allowing a small bending deformation of collars under the effect of coil pre-stress, is an important effect that generates a b 2 multipole at the limit of specification. The study has deepened the understanding of the factors affecting collared coil geometry and field quality. 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| subjects | Apertures Applied sciences Assembly Austenitic-steel collars Coils Collars Correlation analysis Cyclic accelerators and storage rings Dipoles Electrical engineering. Electrical power engineering Electromagnets Exact sciences and technology Experimental methods and instrumentation for elementary-particle and nuclear physics Geometry Large Hadron Collider Magnetic field measurement magnetic field quality Magnetic variables measurement Mechanical variables measurement Multipoles Nuclear physics Performance evaluation Physics Quality control Studies superconducting magnets Suppliers Three dimensional Various equipment and components warm magnetic measurements |
| title | A Correlation Study Between Geometry of Collared Coils and Normal Quadrupole Multipole in the Main LHC Dipoles |
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