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Title: Main field tracking measurement in the LHC superconducting dipole and quadrupole magnets
Authors: Xydi, Panagiota
Sammut, Nicholas
Alemany Fernandez, Reyes
Bottura, Luca
Deferne, Guy
Lamont, Mike
Miles, J.
Mompo, R.
Strzelczyk, Marek
Venturini Delsolaro, Walter
Keywords: Large Hadron Collider (France and Switzerland)
Magnetic fields
Issue Date: 2008
Publisher: INSPIRE
Citation: Xydi, P., Sammut, N., Alemany Fernandez, R., Bottura, L., Deferne, G., Lamont, M.,… Venturini Delsolaro, W. (2008). Main field tracking measurement in the LHC superconducting dipole and quadrupole magnets. 11th European Particle Accelerator Conference, Genoa.
Abstract: 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.
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