Instrumentation and Quench Protection for LARP ${\rm Nb}_{3}{\rm Sn}$ Magnets

Félice, H.; Ambrosio, G.; Chlachidze, G.; Ferracin, P.; Hafalia, R.; Hannaford, R.; Joseph, J.; Lietzke, A.F.; McInturff, A.D.; Muratore, J.; Prestemon, S.; Sabbi, G.; Schmalzle, J.; Wanderer, P.; Wang, X.R.

doi:10.1109/tasc.2009.2019062

Cited by 30 publications

(19 citation statements)

References 8 publications

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“…The value of the external resistor is 95 mΩ, set so that the voltage at the terminals of the magnet never exceeds 1 kV, ±500 V to ground by means of the grounding circuit. A 2D model implemented in CAST3M [13] has been used to determine the parameters of the quench protection system, under the assumption that quench heaters are placed on the outer surface of each layer, covering 50% of the total allowable surface and providing 50 W/cm² [14]. According to the computations, the detection time (from quench initiation to opening of the switch and activation of the heaters) must be lower than 40 (100) ms for a T max below 150 (200) K in the high field region.…”

Section: Quench Protection and Instrumentationmentioning

confidence: 99%

Development of the EuCARD $\hbox{Nb}_{3}\hbox{Sn}$ Dipole Magnet FRESCA2

Ferracin

Devaux

Durante

et al. 2013

IEEE Trans. Appl. Supercond.

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The key objective of the Superconducting High Field Magnet work package of the European Project EuCARD, and specifically of the High Field Model task, is to design and fabricate the Nb3Sn dipole magnet FRESCA2. With an aperture of 100 mm and a target bore field of 13 T, the magnet is aimed at upgrading the FRESCA cable test facility at CERN. The design features four 1.5 m long double-layer coils wound with a 21 mm wide cable. The windings are contained in a support structure based on a 65 mm thick aluminum shell pre-tensioned with bladders. In order to qualify the assembly and loading procedure and to validate the finite element stress computations, the structure will be assembled around aluminum blocks, which replace the superconducting coils, and instrumented with strain gauges. In this paper, we report on the status of the assembly and we update on the progress on design and fabrication of tooling and coils. With an aperture of 100 mm and a target bore field of 13 T, the magnet is aimed at upgrading the FRESCA cable test facility at CERN. The design features four 1.5 m long double-layer coils wound with a 21 mm wide cable. The windings are contained in a support structure based on a 65 mm thick aluminum shell pre-tensioned with bladders. In order to qualify the assembly and loading procedure and to validate the finite element stress computations, the structure will be assembled around aluminum blocks, which replace the superconducting coils, and instrumented with strain gauges. In this paper, we report on the status of the assembly and we update on the progress on design and fabrication of tooling and coils.

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Section: Quench Protection and Instrumentationmentioning

confidence: 99%

Development of the EuCARD $\hbox{Nb}_{3}\hbox{Sn}$ Dipole Magnet FRESCA2

Ferracin

Devaux

Durante

et al. 2013

IEEE Trans. Appl. Supercond.

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“…The LQ heaters provide 100 % coverage based on periodically spaced heating stations that cover a short length of strand about every 10 cm relying on quench propagation between the stations. The main protection parameters are reviewed in TABLE 1 and their design is described in detail in [8].…”

Section: State-of-the Art Nb 3 Sn Magnets and Their Protectionmentioning

confidence: 99%

Quench protection challenges in long nb3sn accelerator magnets

Salmi

Ambrosio²,

Caspi³

et al. 2012

AIP Conference Proceedings

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“…The LQ coil fabrication process (see FIGURE 6) follows the one applied to the TQ coils, with the following modifications: 1) in order to reduce asymmetries, coil are processed in single-cavity reaction and impregnation fixtures (the TQ fixture contained two coils); 2) gaps are reintroduced in the Ti alloy winding pole parts to minimize axial strain in the conductor resulting from winding and heat treatment; 3) a layer of mica is used to reduce friction between the coils and the reaction fixture. Coil instrumentation and protection heaters are provided by flexible circuits called traces, based on a kapton sheet and a 0.025 mm foil of stainless steel impregnated with the coils [37]. Strain gauges are mounted on the coil after impregnation.…”

Section: Long Quadrupole Magnet (Lq)mentioning

confidence: 99%

LARP Nb[sub 3]Sn QUADRUPOLE MAGNETS FOR THE LHC LUMINOSITY UPGRADE

Ferracin

Weisend²

2010

AIP Conference Proceedings

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The US LHC Accelerator Research Program (LARP) is a collaboration between four US laboratories (BNL, FNAL, LBNL, and SLAC) aimed at contributing to the commissioning and operation of the LHC and conducting R&D on its luminosity upgrade. Within LARP, the Magnet Program's main goal is to demonstrate that Nb 3 Sn superconducting magnets are a viable option for a future upgrade of the LHC Interaction Regions. Over the past four years, LARP has successfully fabricated and tested several R&D magnets: 1) the subscale quadrupole magnet SQ, to perform technology studies with 300 mm long racetrack coils, 2) the technology quadrupole TQ, to investigate support structure behavior with 1 m long cos2θ coils, and 3) the long racetrack magnet LR, to test 3.6 m long racetrack coils. The next milestone consists in the fabrication and test of the 3.7 m long quadrupole magnet LQ, with the goal of demonstrating that Nb 3 Sn technology is mature for use in high energy accelerators. After an overview of design features and test results of the LARP magnets fabricated so far, this paper focuses on the status of the fabrication of LQ: we describe the production of the 3.4 m long cos2θ coils, and the qualification of the support structure. Finally, the status of the development of the next 1 m long model HQ, conceived to explore stress and field limits of Nb 3 Sn superconducting magnets, is presented.

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Instrumentation and Quench Protection for LARP ${\rm Nb}_{3}{\rm Sn}$ Magnets

Cited by 30 publications

References 8 publications

Development of the EuCARD $\hbox{Nb}_{3}\hbox{Sn}$ Dipole Magnet FRESCA2

Development of the EuCARD $\hbox{Nb}_{3}\hbox{Sn}$ Dipole Magnet FRESCA2

Quench protection challenges in long nb3sn accelerator magnets

LARP Nb[sub 3]Sn QUADRUPOLE MAGNETS FOR THE LHC LUMINOSITY UPGRADE

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