The 36-T Series-Connected Hybrid Magnet System Design and Integration

Dixon, I.R.; Bole, S.; Cantrell, K.R.; Hannahs, S. T.; Kynoch, John; Marshall, William; Powell, A.; Toth, J.; Bird, M.D.

doi:10.1109/tasc.2016.2628304

Cited by 11 publications

(7 citation statements)

References 11 publications

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“…The result is an extremely "quiet" magnetic field that is well suited to precision measurements requiring high stability (e.g., spin resonance [152]). A 36 T series-connected hybrid magnet with a 40 mm warm bore and ≈ 1 ppm uniformity over 1 cm 3 was recently developed and tested at the NHMFL in Tallahassee [153,154]. With its high stability and excellent field homogeneity, this system is suitable for electron-spin-resonance studies at frequencies up to 1 THz and NMR at ∼ 1.5 GHz proton frequency.…”

Section: Hybrid Magnetsmentioning

confidence: 99%

High magnetic fields for fundamental physics

et al. 2018

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Various fundamental-physics experiments such as measurement of the birefringence of the vacuum, searches for ultralight dark matter (e.g., axions), and precision spectroscopy of complex systems (including exotic atoms containing antimatter constituents) are enabled by high-field magnets. We give an overview of current and future experiments and discuss the state-of-the-art DCand pulsed-magnet technologies and prospects for future developments. * Electronic address: budker@uni-mainz.de †

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Section: Hybrid Magnetsmentioning

confidence: 99%

High magnetic fields for fundamental physics

et al. 2018

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“…• NHMFL in Tallahassee, USA: 41 T resistive (33 MW) [175], 45 T hybrid [176], 36 T hybrid series connected [177], 32 T superconducting (under construction) [178];…”

Section: High Field Solenoidsmentioning

confidence: 99%

A review of commercial high temperature superconducting materials for large magnets: from wires and tapes to cables and conductors

Uglietti

2019

Supercond. Sci. Technol.

186

123

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High Temperature Superconducting (HTS) materials have the potential to generate magnetic field beyond the level obtainable with Low Temperature Superconducting (LTS). This review reports the past and present R&D on HTS cables and conductors for high field tokamaks, accelerator dipoles and large solenoids. Among the HTS wires and tapes available commercially, coated conductor tapes are the most appealing because of the outstanding critical strength and large improvement margin. Limitations are the weakness against peeling and shearing and the short piece length. The prices for technical superconductors are reviewed because they play an important role in large projects; moreover the perspective of industrial production of HTS wires and tapes is discussed considering the historical development of the LTS wire market. Various designs have been proposed for HTS cables and conductors: some are better suited for soft materials, while others can exploit the anisotropy of coated conductors (by aligning the tape with the field), providing the highest current density. The last decade has seen an increase in the size and complexity of the prototypes; however some peculiar features of HTS, such as high stability margin and high mechanical limits, have not yet been fully incorporated in the designs: for example the transposition requirements for HTS have not yet been studied in detail. Several facts indicate that tapes (even if anisotropic) can be used for manufacturing cables and magnets of any size and have advantages with respect to round wires.

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“…The test coil is instrumented with the help of three different compensation coils to help discriminate the nature of the different contributions to the coil voltage experimentally. The first is a pick-up coil co-wound with the pancake to get a 'perfect' magnetic coupling [12][13][14], in principle able to cancel completely the inductive component of the signal, the second one is a solenoidal pick-up coil close to the studied pancake with a partial coupling, and the last one is a Rogowski coil placed at the output of the current source and therefore fully magnetically decoupled. The paper is organized as follows.…”

Section: Aim Of This Workmentioning

confidence: 99%

Transient voltages and energy balance in REBCO insulated magnet: experimental and numerical studies

Vialle

Badel

Rozier

et al. 2021

Supercond. Sci. Technol.

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Different means are investigated today to protect a REBCO coil against local thermal runaway, what is commonly called a "Quench". Metal Insulated Coil or No-Insulated coil have been successfully introduced. However, these protections method may show other issues and are limited in terms of dynamics, making them impractical for fast applications. We successfully tested early detection of dissipative voltage followed by current dumping as a method to protect REBCO insulated test coils, even with engineering current density in the kA/mm2 range. Pick up coils can be used to compensate inductive coil voltage. In previous works we highlighted the presence of transient voltage due to the hysteretic current distribution in REBCO tape width, which can complicate the detection. We then developed a numerical electromagnetic model that reproduce the transient behaviour of REBCO coils. Here we study a small REBCO coil instrumented with three different pick-up coils, including a co-wound pick-up whose coupling is close to perfect. The post processing and analysis of the simulation results makes it possible to identify in the transient coil voltage the contribution due to transient losses and coil inductance variation. The resulting evaluation of the REBCO coil inductance and its variations is validated by analysis of the pick-up coil signals. From a practical point of view, this work shows the possibility to have very sensitive early detection of thermal runaway if the threshold is adjusted based on the expected coil compensated voltage drift. The interest of using isolated high-strength co-wound reinforcement tape as pick-up coil is also highlighted.

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The 36-T Series-Connected Hybrid Magnet System Design and Integration

Cited by 11 publications

References 11 publications

High magnetic fields for fundamental physics

High magnetic fields for fundamental physics

A review of commercial high temperature superconducting materials for large magnets: from wires and tapes to cables and conductors

Transient voltages and energy balance in REBCO insulated magnet: experimental and numerical studies

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