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Author(s)
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Toral, F (Madrid, CIEMAT) ; Alcázar, C (Madrid, CIEMAT) ; Domínguez, M (Madrid, CIEMAT) ; Durán, O (Madrid, CIEMAT) ; Fernández, A (Madrid, CIEMAT) ; García-Matos, J A (Madrid, CIEMAT ; CERN) ; García-Tabarés, L (Madrid, CIEMAT) ; González, L A (Madrid, CIEMAT) ; Gómez, P (Madrid, CIEMAT) ; Jiménez, J (Madrid, CIEMAT) ; Martínez, T (Madrid, CIEMAT) ; Jardim, C Martins (Madrid, CIEMAT) ; Pardo, J A (Madrid, CIEMAT) ; Pérez, J M (Madrid, CIEMAT) ; Sobrino, P (Madrid, CIEMAT) ; Ferradas, S (CERN) ; Bermúdez, S Izquierdo (CERN) ; Perez, J C (CERN) ; Todesco, E (CERN) ; Willering, G (CERN) |
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Abstract
| Nested combined orbit correctors are needed for the upgrade of LHC. They are developed at CIEMAT, in collaboration with CERN in the framework of HL-LHC project. There are two types of magnets, so-called MCBXFA and MCBXFB, with different lengths (2.5 and 1.5 m, respectively), but sharing the same cross section. The coils of both magnets are wound with the same Rutherford-type NbTi cable, composed of 18 strands of 0.48 mm diameter, insulated with a braided glass fiber sleeve. Various magnet protection schemes were considered for MCBXF magnets. In this work, self-protection, energy extraction resistor and quench heaters are discussed emphasizing advantages and disadvantages of each strategy. This analysis is supported by quench calculations performed with Squid (CIEMAT in-house developed code) and Roxie. Selected quench simulation results are presented and compared with measurements done on magnet prototypes. Based on the presented study, a protection scheme with energy extraction resistor was selected for the series magnets. The value of the resistor was optimized and related quench calculations are also included. |