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Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets

One of the most stringent requirements during the energy ramp of the Large Hadron Collider (LHC) is to have a constant ratio between dipole-quadrupole and dipole-dipole field so as to control the variation of the betatron tune and of the beam orbit throughout the acceleration phase, hence avoiding p...

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Autores principales: Xydi, P, Sammut, N, Alemany-Fernandez, R, Bottura, L, Deferne, G, Lamont, M, Miles, J, Mompo, R, Strzelczyk, M, Venturini-Delsolaro, W
Lenguaje:eng
Publicado: 2008
Materias:
Acceso en línea:http://cds.cern.ch/record/1124068
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author Xydi, P
Sammut, N
Alemany-Fernandez, R
Bottura, L
Deferne, G
Lamont, M
Miles, J
Mompo, R
Strzelczyk, M
Venturini-Delsolaro, W
author_facet Xydi, P
Sammut, N
Alemany-Fernandez, R
Bottura, L
Deferne, G
Lamont, M
Miles, J
Mompo, R
Strzelczyk, M
Venturini-Delsolaro, W
author_sort Xydi, P
collection CERN
description One of the most stringent requirements during the energy ramp of the Large Hadron Collider (LHC) is to have a constant ratio between dipole-quadrupole and dipole-dipole field so as to control the variation of the betatron tune and of the beam orbit throughout the acceleration phase, hence avoiding particle loss. To achieve the nominal performance of the LHC, a maximum variation of ±0.003 tune units can be tolerated. For the commissioning with low intensity beams, acceptable bounds are up to 30 times higher. For the quadrupole-dipole integrated field ratio, the above requirements translate in the tight windows of 6 ppm and 180 ppm, while for dipole differences between sectors the acceptable error is of the order of 10^-4. Measurement and control at this level are challenging. For this reason we have launched a dedicated measurement R&D to demonstrate that these ratios can be measured and controlled within the limits for machine operation. In this paper we present the techniques developed to power the magnets during the current ramps, the instrumentation and data acquisition setup used to perform the tracking experiments, the calibration procedure and the data reduction employed.
id cern-1124068
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2008
record_format invenio
spelling cern-11240682023-05-31T13:24:11Zhttp://cds.cern.ch/record/1124068engXydi, PSammut, NAlemany-Fernandez, RBottura, LDeferne, GLamont, MMiles, JMompo, RStrzelczyk, MVenturini-Delsolaro, WMain Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole MagnetsAccelerators and Storage RingsOne of the most stringent requirements during the energy ramp of the Large Hadron Collider (LHC) is to have a constant ratio between dipole-quadrupole and dipole-dipole field so as to control the variation of the betatron tune and of the beam orbit throughout the acceleration phase, hence avoiding particle loss. To achieve the nominal performance of the LHC, a maximum variation of ±0.003 tune units can be tolerated. For the commissioning with low intensity beams, acceptable bounds are up to 30 times higher. For the quadrupole-dipole integrated field ratio, the above requirements translate in the tight windows of 6 ppm and 180 ppm, while for dipole differences between sectors the acceptable error is of the order of 10^-4. Measurement and control at this level are challenging. For this reason we have launched a dedicated measurement R&D to demonstrate that these ratios can be measured and controlled within the limits for machine operation. In this paper we present the techniques developed to power the magnets during the current ramps, the instrumentation and data acquisition setup used to perform the tracking experiments, the calibration procedure and the data reduction employed.LHC-PROJECT-Report-1139CERN-LHC-PROJECT-Report-1139oai:cds.cern.ch:11240682008-08-20
spellingShingle Accelerators and Storage Rings
Xydi, P
Sammut, N
Alemany-Fernandez, R
Bottura, L
Deferne, G
Lamont, M
Miles, J
Mompo, R
Strzelczyk, M
Venturini-Delsolaro, W
Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets
title Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets
title_full Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets
title_fullStr Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets
title_full_unstemmed Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets
title_short Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets
title_sort main field tracking measurement in the lhc superconducting dipole and quadrupole magnets
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1124068
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