Test Results and Analysis of LQS03 Third Long $ \hbox{Nb}_{3}\hbox{Sn}$ Quadrupole by LARP

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Abstract-In preparation for the high luminosity upgrade of the Large Hadron Collider, the LHC Accelerator Research Program (LARP) in collaboration with CERN is pursuing the development of MQXF: a 150 mm aperture high-field Nb 3 Sn quadrupole magnet. The development phase starts with the fabrication and test of several short models (1.2 m magnetic length) and will continue with the development of several long prototypes. All of them are mechanically supported using a shell-based support structure, which has been extensively demonstrated on several R&D models within LARP. The first short model MQXFS-AT has been assembled at LBNL with coils fabricated by LARP and CERN. In this paper, we summarize the assembly process and show how it relies strongly on experience acquired during the LARP 120 mm aperture HQ magnet series. We present comparison between strain gauges data and finite element model analysis. Finally we present the implication of the MQXFS-AT experience on the design of the long prototype support structure.  Index Terms-High Luminosity LHC (HL-LHC), Interaction Regions, quadrupole, LARP, Nb 3 Sn magnet, shell-based support structure, short model.

Section: Amentioning

confidence: 99%

Assembly Tests of the First Nb₃Sn Low-Beta Quadrupole Short Model for the Hi-Lumi LHC

Pan

Félice

Cheng

et al. 2016

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“…One-meter-long models were built since the 90's [25,26]. In 2008, LARP successfully proved the technology up to 3.4-m-long coils [27]. The extension was not trivial, requiring a segmentation of the Al shells to minimize the accumulation of longitudinal stresses.…”

Section: B Lengthmentioning

confidence: 99%

Progress on HL-LHC Nb₃Sn Magnets

Todesco

Annarella

Ambrosio

et al. 2018

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The HL-LHC project aims at allowing to increase the collisions in the Large Hadron Collider by a factor ten in the decade 2025-2035. One essential element are the superconducting magnets around the interaction region points, where large aperture magnets will be installed to allow to further reduce the beam size in the interaction point. The core of this upgrade is the Nb3Sn triplet, made of 150 mm aperture quadrupoles of in the range of 7-8 m. The project is being shared between CERN and US Accelerator Upgrade Program, based on the same design, and on two strand technologies. The project is ending the short model phase, and entering the prototype construction. We will report on the main results of the short model program, including quench performance and field quality. A second important element is the 11 T dipole that replacing a standard dipole makes space for additional collimators. The magnet is also ending the model development and entering the prototype phase. A critical point in the design of this magnet is the large current density, allowing increasing the field from 8 to 11 T with the same coil cross-section as in the LHC dipoles. This is also the first two-in-one Nb3Sn magnet developed so far. We will report the main results on the test and the critical aspects.

“…From a magnet assembly standpoint, a shell-based support structure using bladder and keys was implemented [5] allowing for fine tuning of the sextupole preload and for reversibility of the assembly process. Extensively used in the development of the future LHC Interaction Region quadrupoles [6] and [7], bladder and keys technology was also used in the design study of a 56 GHz ECR ion source [8] and [9]. An overview of the design proposed for the FRIB ECR ion source magnet is reported here along with the progress on a sextupole practice coil fabrication.…”

Section: T He Superconducting Magnet Program At Lawrencementioning

confidence: 99%

“…The magnet assembly process is based on experiences acquired at LBNL on short and long magnet prototypes [6] and [7]. The development of the assembly steps goes hand-in-hand with 2D and 3D FEM mechanical analysis.…”

Section: Magnet Assembly and Preloadmentioning

confidence: 99%

Design of a Superconducting 28 GHz Ion Source Magnet for FRIB Using a Shell-Based Support Structure

Félice

Rochepault

Hafalia

et al. 2015

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The Superconducting Magnet Program at the Lawrence Berkeley National Laboratory (LBNL) is completing the design of a 28 GHz NbTi ion source magnet for the Facility for Rare Isotope Beams (FRIB). The design parameters are based on the parameters of the ECR ion source VENUS in operation at LBNL since 2002 featuring a sextupole-in-solenoids configuration. Whereas most of the magnet components (such as conductor, magnetic design, protection scheme) remain very similar to the VENUS magnet components, the support structure of the FRIB ion source uses a different concept. A shell-based support structure using bladders and keys is implemented in the design allowing fine tuning of the sextupole preload and reversibility of the magnet assembly process. As part of the design work, conductor insulation scheme, coil fabrication processes and assembly procedures are also explored to optimize performance. We present the main features of the design emphasizing the integrated design approach used at LBNL to achieve this result.