| Paper |
Title |
Page |
| WEPCH048 |
Measurement and Modeling of Magnetic Hysteresis in the LHC Superconducting Correctors
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2026 |
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- W. Venturini Delsolaro, L. Bottura, Y. C. Chaudhari, M. Karppinen
CERN, Geneva
- N.J. Sammut
University of Malta, Faculty of Engineering, Msida
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The Large Hadron Collider, now under construction at CERN, relies heavily on superconducting magnets for its optics layout: besides the main magnets, almost all the correcting magnets are superconducting. Along with clear advantages, this brings about complications due to the effects of persistent currents in the superconducting filaments. Correcting magnets that trim key beam parameters or compensate field errors of the main magnets (among others those due to hysteresis), are in their turn hysteretic. The measured magnetic hysteresis and its possible influence on accelerator operation will be presented, in particular the real-time compensation of decay and snapback in the main magnets, and the reproducibility between runs. A detailed characterization of minor hysteresis loops is given, as well as degaussing cycles and modeling work.
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| WEPLS102 |
The Construction of the Superconducting Matching Quadrupoles for the LHC Insertions
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2616 |
| |
- R. Ostojic, P. Canard, N. Catalan-Lasheras, G. Kirby, J.C. Perez, H. Prin, W. Venturini Delsolaro
CERN, Geneva
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After several years of intensive effort, the construction of the superconducting matching quadrupoles for the LHC insertions is nearing completion. We retrace the main events of the project from the initial development of quadrupole magnets of several types to the series production of over 100 complex cryo-magnets, and report on the techniques developed for steering of the production. The main performance parameters for the full series, such as quench training, field quality and magnet geometry are presented. The experience gained in the production of these special superconducting magnets is of considerable value for further development of the LHC insertions.
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| WEPLS106 |
Design, Performance and Series Production of Superconducting Trim Quadrupoles for the Large Hadron Collider
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2628 |
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- M. Karppinen, C. Boyer, J.-M. Castro, H.A. Garcia de Sousa Lopes, C. Giloux, J. Mazet, G. Mugnai, V. Remondino, D. Rodrigues, W. Venturini Delsolaro, R. Wolf
CERN, Geneva
- G. Gaggero, L. Loche, M. Tassisto
ANSALDO Energia, Magnet & Special Product Division, Genova
- P. Khare, A. Puntambekar
RRCAT, Indore (M.P.)
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The Large Hadron Collider (LHC) will be equipped with several thousands of superconducting corrector magnets. Among the largest ones are the superconducting trim quadrupoles (MQTL). These twin-aperture magnets with a total mass of up to 1700 kg have a nominal gradient of 129 T/m at 1.9 K and a magnetic length of 1.3 m. Sixty MQTL are required for the LHC, 36 operating at 1.9 K in and 24 operating at 4.5 K. The paper describes the design features, and reports the measured quench performance and magnetic field quality of the production magnets. The MQTL magnet production is shared between CERN and industry. This sharing is simplified due to the modular construction, common to all twin-aperture correctors.
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