The use of pressurized bladders for stress control of superconducting magnets

Caspi, S.; Gourlay, S.A.; Hafalia, R.; Lietzke, A.F.; O'Neill, J.; Taylor, C.; Jackson, A.

doi:10.1109/77.920313

Cited by 157 publications

(78 citation statements)

References 3 publications

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“…Two lateral keys per side are used: in this way, the forces are better aligned with the coil, especially around the ends. The mechanical structure was based on the bladder and key concept, approach developed at LBNL [5] and successfully used in several model magnets.…”

Section: A Cross-sectionmentioning

confidence: 99%

Assembly, Loading, and Cool-Down of the FRESCA2 Support Structure

Garcia

Giloux

Ziemiański

et al. 2014

IEEE Trans. Appl. Supercond.

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-This paper reports on the assembly process and cool-down to cryogenic temperature of the support structure of FRESCA2, which is a dipole magnet for upgrading the actual CERN cable test facility FRESCA.The structure of the FRESCA2 magnet is designed to provide the adequate pre-stress, through the use of keys, bladders, and an Al alloy shrinking cylinder. In order to qualify the assembly and loading procedures, the structure was assembled with Al blocks (dummy coils) that replaced the brittle Nb 3 Sn coils, and then cooled-down to 77 K with liquid nitrogen. The evolution of the mechanical behaviour was monitored via strain gauges located on different components of the structure (shell, rods, yokes and dummy coils).We focus on the expected stresses within the structure after assembly, loading and cool-down. The expected stresses were determined from the 3D finite element model of the structure. A comparison of the 3D model stress predictions with the strain gauge data measurements is made. The coherence between the predicted stresses with the experimental gauge measurements will validate the FEM model of the structure. IndexTerms-dipole, EuCARD, magnet, Nb 3 Sn, superconducting accelerator magnet.

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Section: A Cross-sectionmentioning

confidence: 99%

Assembly, Loading, and Cool-Down of the FRESCA2 Support Structure

Garcia

Giloux

Ziemiański

et al. 2014

IEEE Trans. Appl. Supercond.

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“…The second concept, used in the TQS magnets ([2]- [7]), is based on an aluminum shell surrounding an iron yoke and support pads. In this design, a small amount of the preload (between 10 and 40 %) is applied to the coil at room temperature by the bladder and key operation [8]. The main part of the pre-stress is then provided during cool-down by the shrinkage of the outer aluminum shell.…”

Section: Mechanical Analysismentioning

confidence: 99%

Magnetic and Mechanical Analysis of the HQ Model Quadrupole Designs for LARP

Félice

Caspi

Ferracin

et al. 2008

IEEE Trans. Appl. Supercond.

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Abstract-Insertion quadrupoles with large bore and high gradient are required to upgrade the luminosity of the Large Hadron Collider (LHC). The US LHC Accelerator Research Program is developing Nb 3 Sn technology for the upgrade. This effort includes a series of 1 m long Technology Quadrupoles (TQ), to demonstrate the reproducibility at moderate field, and High-gradient Quadrupoles (HQ) to explore the magnet performance limits in terms of peak fields, forces and stresses. The HQ models are expected to achieve peak fields of 15 T or higher. A coil aperture of 90 mm, corresponding to gradients above 300 T/m, was chosen as the baseline. Peak stresses above 150 MPa are expected. Progress on the magnetic and mechanical design of the HQ models will be reported.

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“…In the first R&D phase, dealing with 1-m long model magnets, two different mechanical designs have been pursued and evaluated: the classical collar-type structure and the so-called shell-bladder structure. The shell-bladder structure, first proposed and developed by LBNL 20) , basically consists in pre-compressing the coils against an external restraining cylinder. With respect to the classical collar system, in the shell-bladder concept stress is directly controlled, rather than resulting from the interference between collar and coil.…”

Section: Low-beta Quadrupoles For Irsmentioning

confidence: 99%

Superconducting Magnet Development for the LHC Upgrades

Rossi

2012

TEION KOGAKU

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LHC is now delivering proton and heavy ion collisions at the highest energy. Upgrading the LHC beyond its design performance is a long term program that started during the LHC construction, with some fundamental R&D programs.The upgrade program is based on a vigorous superconductor and magnet R&D, aimed at increasing the field in Review ArticleSuperconducting Magnet Development for the LHC Upgrades Lucio ROSSI * Synopsis: LHC is now delivering proton and heavy ion collisions at the highest energy. Upgrading the LHC beyond its design performance is a long term program that started during the LHC construction, with some fundamental R&D programs. The upgrade program is based on a vigorous superconductor and magnet R&D, aimed at increasing the field in accelerator magnets from 8 T to 12 T for the luminosity upgrade, with the scope of increasing the collider luminosity by a factor 5 to 10 from 2022. The upgrade program might continue with the LHC energy upgrade, which would require magnets producing field in the range of 16-20 T. The results obtained so far and the future challenges are discussed together with the possible plan to reach the goals.

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The use of pressurized bladders for stress control of superconducting magnets

Cited by 157 publications

References 3 publications

Assembly, Loading, and Cool-Down of the FRESCA2 Support Structure

Assembly, Loading, and Cool-Down of the FRESCA2 Support Structure

Magnetic and Mechanical Analysis of the HQ Model Quadrupole Designs for LARP

Superconducting Magnet Development for the LHC Upgrades

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