3D Mechanical Design and Stress Analysis of 20 T Common-Coil Dipole Magnet for SppC

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Iron-based superconducting (IBS) racetrack coils were firstly fabricated by using 100-m 7-filamentary Ba1-xKxFe2As2 (Ba122) tapes at the Institute of High Energy Physics, Chinese Academy of Sciences (IHEP, CAS). The IBS tape was wound in parallel with stainless steel tape to withstand the high tensile hoop stress under high magnetic field. After the heat treatment, the coils were impregnated with epoxy resin. Then the IBS coils were tested in a low-temperature superconducting Common-Coil dipole magnet which provided a maximum background field of 10 T at 4.2 K. Most importantly, the best IBS racetrack coil quenched at 4.2 K and 10 T with an operating current of 65 A, which is still as high as 86.7% of critical current of the short sample at 10 T. The details of the fabrication process and performance test results were presented in this paper. The performance test demonstrated the IBS conductor is a promising candidate for the application of high field magnets especially for future high-energy accelerators.

Section: Development Of Ibs Racetrack Coilsmentioning

confidence: 99%

First performance test of the iron-based superconducting racetrack coils at 10 T

Zhang

Wang

Wei

et al. 2021

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“…The baseline for the dipole field of the SPPC is 12 T according to a 75 TeV collision-energy design and a more aggressive goal would be 20-24 T for a 125-150 TeV collision-energy design [2]. To accomplish this target, a three-step R&D process has been proposed at IHEP [4][5][6][7][8][9]. For the first step, three subscale dipole magnets have already been designed, fabricated and tested with Nb 3 Sn and NbTi superconductors to investigate the fabrication process and characteristics of the common-coil dipole, and also to realize the 12 T magnetic field [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Development of superconducting model dipole magnets beyond 12 T with a combined common-coil configuration

Wang

Shi

et al. 2023

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The superconducting magnet group at IHEP (the Institute of High Energy Physics, Chinese Academy of Sciences, China) has been engaging in the R&D of high field accelerator magnets since 2014 for the pre-study of the next-generation high energy particle accelerators like CEPC-SPPC (Circular Electron Positron Collider-Super Proton Proton Collider), FCC (Future Circular Collider) and etc. A superconducting model dipole magnet named LPF1 was firstly fabricated with NbTi and Nb3Sn combined common-coil configuration in 2017 and tested in 2018, a main field of 10.23 T was reached within two 10-mm apertures. The magnet was reassembled with higher pre-stress in 2019 to investigate the influence of pre-stress loading level on the performance of common-coil dipole magnets. The main field of this upgraded magnet named LPF1-S was increased to 10.71 T within two 12-mm apertures. By improving the key process technologies in Rutherford cable fabrication, coil winding, Nb3Sn & NbTi splices soldering and coil impregnation, the recently fabricated model dipole magnet named LPF1-U got a 12.47-T main field in two 14-mm apertures in 2021. To fully take advantage of Nb3Sn and NbTi superconductors in different field regions, LPF1-U was still designed and developed with a combined coil configuration with Nb3Sn for the inner two coils and NbTi for the outer four coils. Besides, graded coil topology and different coil LSS (length of straight section) settings were adopted in the optimization of LPF1-U layouts. Bladder and key technology was used for the support structure and fiber optic sensors based on the FBG (Fiber Bragg Grating) were utilized to monitor the stress distribution and variation in the structures and coils through the whole process from magnet assembly to cool-down and excitation. During the performance test, a relatively large number of trainings were carried out and LPF1-U became more stable after thermal cycle. A peak field of 12.7 T in coils (12.47 T main field in apertures) corresponds to the operating current of 6865 A and the load line ratio of 90 % was finally attained. It is worth mentioning that LPF1-U is the first hybrid - Nb3Sn, NbTi- common coil dipole magnet which has achieved a main field of more than 12 T in two apertures. The design, fabrication and performance analysis of LPF series dipole magnets are presented in this paper.

“…Besides, the HTS racetrack coil is also a commonlyused superconducting component in HTS machines and accelerator magnets, which can produce higher magnetic field and field homogeneity due to the structure feature of racetrack coil. Several researchers have carried out mechanical analysis of the racetrack coil [6,[36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic-mechanical coupling analysis of high-temperature superconducting racetrack coil

Yu,

Niu,

Yong

et al. 2023

The second-generation high-temperature superconducting (HTS) coated conductor has been recognized as one of the most promising materialsfor high field magnets due to its superior electromagnetic and mechanical performances. HTS racetrack coils wound with the coated conductors are an extensively used configuration in engineering applications, such as HTS machines and high-speed maglevs. In this paper, in order to analyze the electromagnetic and mechanical behaviors of HTS racetrack coils, a 3D coupled electromagnetic-mechanical model is used to consider the effect of coil deformation and the strain dependence of critical current. The effectiveness of the coupled model is validated by comparing the numerical results with experimental data in the literature. A numerical simulation of a 3D HTS racetrack coil subjected to an external electromagnetic field is carried out using coupled and uncoupled models. The results indicate that the structure deformation can reduce the penetration depth of the screening current, and the hoop stress and strain are mainly concentrated on the circular part of the racetrack coil. Afterwards, the influences of various parameters on the electromagnetic and mechanical responses of the HTS racetrack coil are also investigated.