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MSC Seminars
Designing quench protection for high-field Nb3Sn accelerator magnets
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Europe/Zurich
30/7-010 (CERN)
Description
Abstract:
Quench protection is one of the several challenges in developing high-field Nb3Sn accelerator magnets for applications such as the interaction region magnets for LHC luminosity upgrade. In particular, safe dissipation of the large stored energy in the windings after a quench necessitates efficient protection heaters to spread the normal zone across the windings. At the same time, technical implementation of such heaters in several meter long magnets requires significant optimizations of the present state-of-the-art protection technology.
In this seminar, we identify the new protection challenges arising from the technology jump from LHC NbTi to Nb3Sn magnets. We describe the quench protection of the LARP (LHC Accelerator Research Program) R&D Nb3Sn quadrupoles LQ and HQ (respective magnet lengths and stored energies: 3.6 m with about 0.5 MJ/m and 0.9 m with about 1 MJ/m), and discuss the suitability of the same protection technology in longer accelerator magnets. Subsequently we present a new numerical quench protection design tool, Qcode, which is being developed at LBNL as part of the integrated modeling approach. Its goal is to analyze the temperature and voltage evolution in the coil during a quench with a specified protection scheme, and ultimately to optimize and define the performance limits of the present strip heater technology. Finally, we give an overview of the protection experiments performed on LQ and HQ aiming at characterizing the protection performance and at supporting the Qcode development.
Quench protection is one of the several challenges in developing high-field Nb3Sn accelerator magnets for applications such as the interaction region magnets for LHC luminosity upgrade. In particular, safe dissipation of the large stored energy in the windings after a quench necessitates efficient protection heaters to spread the normal zone across the windings. At the same time, technical implementation of such heaters in several meter long magnets requires significant optimizations of the present state-of-the-art protection technology.
In this seminar, we identify the new protection challenges arising from the technology jump from LHC NbTi to Nb3Sn magnets. We describe the quench protection of the LARP (LHC Accelerator Research Program) R&D Nb3Sn quadrupoles LQ and HQ (respective magnet lengths and stored energies: 3.6 m with about 0.5 MJ/m and 0.9 m with about 1 MJ/m), and discuss the suitability of the same protection technology in longer accelerator magnets. Subsequently we present a new numerical quench protection design tool, Qcode, which is being developed at LBNL as part of the integrated modeling approach. Its goal is to analyze the temperature and voltage evolution in the coil during a quench with a specified protection scheme, and ultimately to optimize and define the performance limits of the present strip heater technology. Finally, we give an overview of the protection experiments performed on LQ and HQ aiming at characterizing the protection performance and at supporting the Qcode development.
Organised by
Ezio Todesco
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