A new support structure for high field magnets

Hafalia, R.; Bish, P.; Caspi, S.; Dietderich, D.R.; Gourlay, S.A.; Hannaford, R.; Lietzke, A.F.; Liggins, N.; McInturff, A.D.; Sabbi, G.; Scanlan, R.M.; O'Neill, J.; Swanson, J.

doi:10.1109/tasc.2002.1018349

Cited by 54 publications

(16 citation statements)

References 2 publications

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“…Figure 4a clearly shows the linear behavior of the azimuthal FBG response with the azimuthal strain during the assembly at room temperature, when, by using the bladders and keys technology [9] the shell is gradually set to different pre-stress values in order to deliver the designed pre compression to the coil pack. The strain sensitivity S ε is found to be 0.7 pm/με and 0.8 pm/με for the sensors in the azimuthal direction giving coherent strain values measured by the FBGs in respect to the values measured by the resistive strain gauges.…”

Section: Resultsmentioning

confidence: 99%

Fiber optic cryogenic sensors for superconducting magnets and superconducting power transmission lines at CERN

et al. 2014

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The design, fabrication and tests of a new generation of superconducting magnets for the upgrade of the LHC require the support of an adequate, robust and reliable sensing technology. The use of Fiber Optic Sensors is becoming particularly challenging for applications in extreme harsh environments such as ultra-low temperatures, high electromagnetic fields and strong mechanical stresses offering perspectives for the development of technological innovations in several applied disciplines.

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Section: Resultsmentioning

confidence: 99%

Fiber optic cryogenic sensors for superconducting magnets and superconducting power transmission lines at CERN

et al. 2014

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“…The first concept (Collarbased, "C" in the magnet acronyms) is derived from the structure of the MQXB NbTi quadrupoles built at Fermilab for the LHC Interaction Regions [4], and it clamps the coils in stainless steel collars contained within a 2-piece iron yoke and an external welded stainless steel shell. The second concept (Shell-based, "S" in the magnet acronyms), is an evolution of support structures developed at LBNL for Nb 3 Sn high field dipoles [5][6], and it provides coil support through an aluminum shell pre-tensioned with water-pressurized bladders. In the collar-based concept, the target coil pre-load, required to minimize conductor motion during excitation, is mostly reached at room temperature through the collaring and shell-welding operation, and then maintained during cool-down.…”

Section: Overview Of the Larp Magnet Programmentioning

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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“…The LBNL group has been trying to develop hybrid cables following our design 7 . They have had some success, but the cabling is difficult because Cu is considerable softer in its drawing properties than Nb 3 Sn strand even when the Cu is full hard.…”

Section: Conductor Optimizationmentioning

confidence: 99%

“…This learning model is built using a cable composed of ITER strand, and will produce 5.2 Tesla at the center probe and 7.6 Tesla maximum in the winding. In its design we utilize all of the features of pancake coil geometry and stress management for our high-field Nb 3 Sn design, and we also adopt two innovations that the LBNL group has made in their development of superconducting dipoles: self-contained pancake coil subassemblies 7 that eliminate the need for external control of axial loading, and expandable stainless steel bladders to deliver uniform preload to the coil support structure and relax dimensional tolerances 8 .…”

Section: Introductionmentioning

confidence: 99%

Final Technical Report

McIntyre¹

2006

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A new support structure for high field magnets

Cited by 54 publications

References 2 publications

Fiber optic cryogenic sensors for superconducting magnets and superconducting power transmission lines at CERN

Fiber optic cryogenic sensors for superconducting magnets and superconducting power transmission lines at CERN

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

Final Technical Report

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