Assembly and Test Results of the RMM1a,b Magnet, a CERN Technology Demonstrator Towards Nb<sub>3</sub>Sn Ultimate Performance

Gautheron, Emma; Bordini, B.; Campagna, Guillaume; Félice, H.; Fleiter, J.; Guinchard, Michael; Bermúdez, Susana Izquierdo; Mugnier, Sylvain; Pérez, Juan Carlos; Petrone, Carlo; Tommasini, D.; Willering, Gerard

doi:10.1109/tasc.2023.3265351

Cited by 2 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• For superconducting dipole magnet models and demonstrators: SM, LR, SD, RD, HD, SMC, RMC, FRESCA2, E-RMC and RMM [33][34][35][36][37][38][39][40][41][42][43][44][45]. • Regarding quadrupole magnet models and demonstrators: SQ, TQS, LQ, HQ and MQXF [46][47][48][49][50].…”

Section: Collaring Vs Bladder and Keymentioning

confidence: 99%

“…In simpler words, the solution would consist in placing additional bladders in the iron yoke cooling holes that would open up the cylinder without exerting any force onto the coil-pack. As just stated, such a solution is inspired by the previous experience coming from the assembly of racetrack model magnets (SMC, RMC, E-RMC and RMM [39][40][41][42][43]) and the FRESCA2 dipole magnet [44,45] at CERN For these magnets, additional bladders located in the iron yoke are used in combination with the coil-pack ones. By doing so, one can reach the required assembly force while keeping the bladder pressure at reasonable values, i.e.…”

Section: Conceptual Procedures and Analysismentioning

confidence: 99%

See 1 more Smart Citation

Optimizing the use of pressurized bladders for the assembly of HL-LHC MQXFB magnets

Troitino

Ambrosio

Bourcey

et al. 2023

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

The use of pressurized bladders for stress control of superconducting magnets was firstly proposed at Lawrence Berkeley National Laboratory (LBNL) in the early 2000s. Since then, the so-called “bladders and keys” procedure has become one of the reference techniques for the assembly of high-field accelerator magnets and demonstrators. Exploiting the advantages of this method is today of critical importance for Nb3Sn-based accelerator magnets, whose production requires the preservation of tight stress targets in the superconducting coils to limit the effects of the strain sensitivity and brittleness of the conductor. The present manuscript reports on the results of an experimental campaign focused on the optimization of the “bladders and keys” assembly process in the MQXFB quadrupoles. These 7.2 m. long magnets shall be among the first Nb3Sn cryomagnets to be installed in a particle accelerator as a part of the High Luminosity upgrade of the LHC. One of the main practical implications of the bladders technique, especially important when applied to long magnets like MQXFB, is that to insert the loading keys, the opening of a certain clearance in the support structure is required. The procedure used so far for MQXF magnets involved an overstress in the coils during bladder inflation. The work presented here shows that such an overshoot can be eliminated thanks to additional bladders properly positioned in the structure. This optimized method was validated in a short model magnet and in a full-length mechanical model, becoming the new baseline for the series production at CERN. Furthermore, the results are supported by numerical predictions using Finite Element models.

show abstract

Section: Collaring Vs Bladder and Keymentioning

confidence: 99%

Section: Conceptual Procedures and Analysismentioning

confidence: 99%

Optimizing the use of pressurized bladders for the assembly of HL-LHC MQXFB magnets

Troitino

Ambrosio

Bourcey

et al. 2023

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Concerning the dipole Nb3Sn demonstrators, a wide set of architectures are being studied by some of the National Laboratories contributing to the HFM Program: (i) CERN magnet group is studying a cosine-theta and block-type magnet [8], [9]; (ii) the Italian National Institute for Nuclear Physics (INFN) works on the cosine-theta dipole Falcon D [10]; (iii) the French Alternative Energies and Atomic Energy Commission (CEA) designed a set of tools (from racetracks to ultimate-field demonstrators) towards their ultimate-field block-type magnet F2D2 [11]; (iv) The Spanish Centre for Energy, Environmental and Technological Research (CIEMAT) completed, in the context of the European Circular Energy-Frontier Collider Study (EuroCirCol study), the conceptual design of a commoncoils demonstrator [12] and prepares a test of racetrack coils in a common-coil configuration. The standard common-coils configurations have been studied by the past [13] and is being considered as an option for the super proton-proton collider (SppC) [14].…”

mentioning

confidence: 99%

Subscale Stress-Managed Common Coil Design

Araujo,

Auchmann,

Brem

et al. 2024

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

In the context of the High-Field Magnet (HFM) Programme, hosted at CERN, and the Swiss Accelerator Research and Technology (CHART) Initiative, hosted at PSI, the Magnet Development (MagDev) project aims to contribute to the Future Circular Collider (FCC) studies through, among others: (i) research on enabling technologies and (ii) high-field low temperature (LTS) and high temperature superconducting (HTS) magnets. After a first experience with the CD1 magnet, a cantedcosine-theta (CCT) Nb3Sn demonstrator, a roadmap has been established with milestones ranging from enabling technologies tested in powered samples and coils, to ultimate-field and Hybrid LTS/HTS short magnets. This paper describes the conceptual design of the subscale stress-managed common-coils platform, which is an R&D vehicle for testing enabling technologies, innovative design concepts, and LTS and Hybrid LTS/HTS coils.The different aspects of the design will be discussed, including the concept proposed for this platform, magnetic design, coil-ends optimization and mechanical analysis.

show abstract

Assembly and Test Results of the RMM1a,b Magnet, a CERN Technology Demonstrator Towards Nb₃Sn Ultimate Performance

Cited by 2 publications

References 18 publications

Optimizing the use of pressurized bladders for the assembly of HL-LHC MQXFB magnets

Optimizing the use of pressurized bladders for the assembly of HL-LHC MQXFB magnets

Subscale Stress-Managed Common Coil Design

Contact Info

Product

Resources

About

Assembly and Test Results of the RMM1a,b Magnet, a CERN Technology Demonstrator Towards Nb3Sn Ultimate Performance

Cited by 2 publications

References 18 publications

Optimizing the use of pressurized bladders for the assembly of HL-LHC MQXFB magnets

Optimizing the use of pressurized bladders for the assembly of HL-LHC MQXFB magnets

Subscale Stress-Managed Common Coil Design

Contact Info

Product

Resources

About

Assembly and Test Results of the RMM1a,b Magnet, a CERN Technology Demonstrator Towards Nb₃Sn Ultimate Performance