Design Overview of the MIT 1.3-GHz LTS/HTS NMR Magnet with a New REBCO Insert

Park, Dong Keun; Bascuñán, J.; Li, Yi; Lee, Woo Seung; Choi, Yoon Hyuck; Iwasa, Y.

doi:10.1109/tasc.2021.3064006

Cited by 30 publications

(12 citation statements)

References 31 publications

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“…For this reason, they can be directly solved using tridiagonal solvers such as the tridiagonal matrix algorithm which are computationally efficient and do not require any iterations to couple spatial nodes in 2D space. During the quenching process, the thermal capacity and conductivity will change dramatically with the temperature values and introduce nonlinearity into equations ( 7) and (8). Therefore, an iterative strategy is employed for the solving procedures to improve the nonlinear solution accuracy.…”

Section: The Adi Methodmentioning

confidence: 99%

“…The radial current path can help reduce Joule heat in the spiral normal zone to avoid the local overheating phenomenon and burnout accidents. Owing to this self-protecting nature, the NI technique has attracted considerable attention from superconducting magnet designers and many NI magnet projects have been accomplished [1][2][3][4][5][6][7] or in progress [8,9]. Other variants of no-insulation magnets including 'metal as insulation (MI)' [10,11] and 'intra-layer noinsulation (LNI)' [12,13] have also been constructed.…”

Section: Introductionmentioning

confidence: 99%

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Quench analysis of a no-insulation REBCO magnet based on the ADI method considering the coupling effect of the cryostat

Zheng,

Liu,

Song

et al. 2023

Supercond. Sci. Technol.

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A no-insulation (NI) REBCO superconducting magnet is under development at Wuhan National High Magnetic Field Center, China. The magnet with the liquid helium cryostat system has a compact structure to reduce the space required for operation. During a quench, the fast-changing spatial magnetic field around the NI magnet may induce a strong eddy current in the conductive parts of the cryostat. The eddy current and its associated Lorentz force will generate mechanical stress on the cryostat, especially on the thermal shield (TS). The mechanical strength of the cryostat needs verification in the preliminary design. Furthermore, the degree to which the electromagnetic coupling between the cryostat and NI magnet might impact the quench behaviors of the NI magnet remains uncertain. In this paper, a multi-physics quench model is newly developed for the NI REBCO magnet, and the alternating direction implicit method is employed for the solver of the thermal model to improve computational efficiency. This simulation model can consider the electromagnetic coupling effect between the NI magnet and cryostat by constructing a partial element equivalent circuit. A quench analysis has been performed and we found that: (1) The cryostat can function as a secondary shorted circuit to the NI magnet and slow down the quench speed to a certain extent. (2) During the rather fast inductive quench phase, the cryostat will experience an attraction force towards the quench propagation frontier. (3) A quench propagation from one end of the magnet can cause a significant z-axis unbalanced force on the TS. (4) Cryostat materials with drastically changed electrical conductivity can significantly affect their mechanical responses during a quench. However, the eddy current density and maximum Von Mises stress on the TS are barely affected by the thickness of the TS and the contact resistance of the NI REBCO magnet.

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Section: The Adi Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quench analysis of a no-insulation REBCO magnet based on the ADI method considering the coupling effect of the cryostat

Zheng,

Liu,

Song

et al. 2023

Supercond. Sci. Technol.

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“…1 H, 15 N-SOFAST-HMQC and 1 H, 15 N-BEST-TROSY NMR spectra of proteins at 1.2 GHz have been acquired and were compared with respect to resolution and sensitivity to spectra obtained at 900 and 950 MHz, which resulted in clear improvements at the highest magnetic field; these results are promising for future applications to glycans using ultra-high field NMR spectroscopy at > 1 GHz. To obtain even higher magnetic field strengths for NMR spectrometers operated in a persistent mode, it will be essential to construct high quality superconducting joints between HTS coils as well as between HTS and LTS wires in order to reach such goals. , Furthermore, the HTS can be used in another very interesting area of NMR spectroscopy, viz., in the construction of cryogen-free power-driven magnets, as was shown by an HTS magnet operating at 9.4 T corresponding to a 1 H frequency of 400 MHz . The operation temperature of the magnet is 14–18 K, which allows the magnet to maintain the superconducting state, using a high-stability power supply and a helium compressor.…”

Section: Technological Developmentsmentioning

confidence: 99%

“…To obtain even higher magnetic field strengths for NMR spectrometers operated in a persistent mode, it will be essential to construct high quality superconducting joints between HTS coils as well as between HTS and LTS wires in order to reach such goals. 470,471 Furthermore, the HTS can be used in another very interesting area of NMR spectroscopy, viz., in the construction of cryogen-free powerdriven magnets, as was shown by an HTS magnet operating at 9.4 T corresponding to a 1 H frequency of 400 MHz. 472 The operation temperature of the magnet is 14−18 K, which allows the magnet to maintain the superconducting state, using a high-stability power supply and a helium compressor.…”

Section: Low Field Magnets High-temperature Superconductors and High ...mentioning

confidence: 99%

Primary Structure of Glycans by NMR Spectroscopy

Fontana

Widmalm

2023

Chem. Rev.

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Glycans, carbohydrate molecules in the realm of biology, are present as biomedically important glycoconjugates and a characteristic aspect is that their structures in many instances are branched. In determining the primary structure of a glycan, the sugar components including the absolute configuration and ring form, anomeric configuration, linkage(s), sequence, and substituents should be elucidated. Solution state NMR spectroscopy offers a unique opportunity to resolve all these aspects at atomic resolution. During the last two decades, advancement of both NMR experiments and spectrometer hardware have made it possible to unravel carbohydrate structure more efficiently. These developments applicable to glycans include, inter alia, NMR experiments that reduce spectral overlap, use selective excitations, record tilted projections of multidimensional spectra, acquire spectra by multiple receivers, utilize polarization by fast-pulsing techniques, concatenate pulse-sequence modules to acquire several spectra in a single measurement, acquire pure shift correlated spectra devoid of scalar couplings, employ stable isotope labeling to efficiently obtain homo-and/or heteronuclear correlations, as well as those that rely on dipolar cross-correlated interactions for sequential information. Refined computer programs for NMR spin simulation and chemical shift prediction aid the structural elucidation of glycans, which are notorious for their limited spectral dispersion. Hardware developments include cryogenically cold probes and dynamic nuclear polarization techniques, both resulting in enhanced sensitivity as well as ultrahigh field NMR spectrometers with a 1 H NMR resonance frequency higher than 1 GHz, thus improving resolution of resonances. Taken together, the developments have made and will in the future make it possible to elucidate carbohydrate structure in great detail, thereby forming the basis for understanding of how glycans interact with other molecules.

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“…aged in several cases after high field generation; e.g., the LBC3 [5], [6], and the MIT 1.3-GHz NMR insert magnet [8].…”

Section: Introductionmentioning

confidence: 99%

Plastic Deformation Simulation of REBCO Tapes Using Particle Methods

Mato

Noguchi

2022

IEEE Trans. Appl. Supercond.

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Ultra-high field superconducting magnets are facing a mechanical degradation problem. On 2017, a world-record high DC magnetic field of 45.5 T was generated by insert no-insulation (NI) Rare-Earth Barium Copper Oxide (REBCO) pancake coils (14.4 T), called "LBC3", and an outsert resistive magnet (31.1 T). Although the experiment showed a high potential of the NI REBCO magnets for ultra-high field generation, the insert NI REBCO pancake coils and the REBCO tapes were plastically deformed. The critical current properties of damaged REBCO tapes were degraded although the Hastelloy substrate of REBCO tapes is stiff and it has a high yield point of approximately 1 GPa. However, the mechanisms of the damaging REBCO tapes are not clarified. Therefore, it is necessary to clarify the mechanical phenomenon of REBCO tapes.In this paper, we model a REBCO tape with a smoothed particle hydrodynamics (SPH) method, which can represent plastic deformation. The SPH simulation is coupled with electromagnetic analysis with a partial element equivalent circuit (PEEC) model which we have previously developed. In the simulation, an external field, which linearly increases to 5 T and then decreases to 0 T, is applied to a short-length REBCO tape. The simulation results show that the REBCO tape largely deforms during the external field excitation and deexcitation.

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Design Overview of the MIT 1.3-GHz LTS/HTS NMR Magnet with a New REBCO Insert

Cited by 30 publications

References 31 publications

Quench analysis of a no-insulation REBCO magnet based on the ADI method considering the coupling effect of the cryostat

Quench analysis of a no-insulation REBCO magnet based on the ADI method considering the coupling effect of the cryostat

Primary Structure of Glycans by NMR Spectroscopy

Plastic Deformation Simulation of REBCO Tapes Using Particle Methods

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