Progress in the Development and Construction of a 32-T Superconducting Magnet

Weijers, H.W.; Hannahs, S. T.; Murphy, T. P.; Markiewicz, W.D.; Gavrilin, A.V.; Voran, A. J.; Viouchkov, Y.; Gundlach, S.; Noyes, P. D.; Abraimov, Dima V.; Bai, Hongyu

doi:10.1109/tasc.2016.2517022

Cited by 196 publications

(123 citation statements)

References 26 publications

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“…Through magnetic coupling quench of Nb-Ti and Nb 3 Sn magnets would trigger the HTS magnet to quench. In the case of the Nb-Ti/Nb 3 Sn/REBCO 32 T magnet 12 , the inner 17 T, 34 mm bore, ~100 kg REBCO magnet is powered with an independent power supply circuit and has to be protected with a total heater energy of 160 kJ, supplied by a high voltage battery system, in comparison to 300 J for active protection of the outsert 1400 kg, 15 T, 250 mm bore Nb-Ti/Nb 3 Sn magnet 9,36,37 . Bi-2212 presents a feasible path to developing commercial, more userfriendly 25-30 T solenoid systems than the 32 T magnet.…”

Section: Discussionmentioning

confidence: 99%

Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2

Shen

Bosque

Davis

et al. 2019

Sci Rep

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High-temperature superconductors (HTS) could enable high-field magnets stronger than is possible with Nb-Ti and Nb 3 Sn, but two challenges have so far been the low engineering critical current density J E , especially in high-current cables, and the danger of quenches. Most HTS magnets made so far have been made out of REBCO coated conductor. Here we demonstrate stable, reliable and training-quench-free performance of Bi-2212 racetrack coils wound with a Rutherford cable fabricated from wires made with a new precursor powder. These round multifilamentary wires exhibited a record J E up to 950 A/mm 2 at 30 T at 4.2 K. These coils carried up to 8.6 kA while generating 3.5 T at 4.2 K at a J E of 1020 A/mm 2 . Different from the unpredictable training performance of Nb-Ti and Nb 3 Sn magnets, these Bi-2212 magnets showed no training quenches and entered the flux flow state in a stable manner before thermal runaway and quench occurred. Also different from Nb-Ti, Nb 3 Sn, and REBCO magnets for which localized thermal runaways occur at unpredictable locations, the quenches of Bi-2212 magnets consistently occurred in the high field regions over a long conductor length. These characteristics make quench detection simple, enabling safe protection, and suggest a new paradigm of constructing quench-predictable superconducting magnets from Bi-2212.

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Section: Discussionmentioning

confidence: 99%

Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2

Shen

Bosque

Davis

et al. 2019

Sci Rep

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“…Therefore the proportionality between nominal pressure and the size of asperities as described by equation (2) is no longer strictly valid. Under increasing load, the increase in size of asperity spots is hindered by neighboring oxides covered areas, so Rc decreases much slower than that in equation (3). Secondly, in a REBCO-to-substrate contact, the transport current distribution within the copper stabilizer layer is not uniform and might be pressure dependent.…”

Section: B) Contact Resistancementioning

confidence: 97%

Contact resistance between two REBCO tapes under load and load cycles

Lü

Goddard

Han

et al. 2017

Supercond. Sci. Technol.

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No-insulation (NI) REBCO magnets have many advantages. They are self-protecting, therefore do not need quench detection and protection which can be very challenging in a high Tc superconducting magnet. Moreover, by removing insulation and allowing thinner copper stabilizer, NI REBCO magnets have significantly higher engineering current density and higher mechanical strength. On the other hand, NI REBCO magnets have drawbacks of long magnet charging time and high field-ramp-loss. In principle, these drawbacks can be mitigated by managing the turn-to-turn contact resistivity (Rc). Evidently the first step toward managing Rc is to establish a reliable method of accurate Rc measurement. In this paper, we present experimental Rc measurements of REBCO tapes as a function of mechanical load up to 144 MPa and load cycles up to 14 times. We found that Rc is in the range of 26-100 µΩ -cm 2 ; it decreases with increasing pressure, and gradually increases with number of load cycles. The results are discussed in the framework of Holm's electric contact theory.

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“…In this respect, REBa 2 Cu 3 O x (REBCO, where RE = rare earth) coated conductors stand out owing to the strong mechanical stress tolerance and high current-carrying capability 3 . Recently, REBCO coated conductors are being used in the design and construction of a 32 T all-superconducting magnet (under test), where the REBCO insert magnet produces 17 T in a background 15 T provided by a LTS magnet 4 . REBCO coated conductors have also been demonstrated in a magnet with an overall 42.5 T field generated by a 11.3 T REBCO insert coil in a 31.2 T background field 5 , a 26 T superconducting magnet 6 , and the concept design of a 100 T magnet 7 .…”

Section: Introductionmentioning

confidence: 99%

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

Zhang

Gharahcheshmeh

et al. 2017

Sci Rep

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A main challenge that significantly impedes REBa2Cu3Ox (RE = rare earth) coated conductor applications is the low engineering critical current density J e because of the low superconductor fill factor in a complicated layered structure that is crucial for REBa2Cu3Ox to carry supercurrent. Recently, we have successfully achieved engineering critical current density beyond 2.0 kA/mm2 at 4.2 K and 16 T, by growing thick REBa2Cu3Ox layer, from ∼1.0 μm up to ∼3.2 μm, as well as controlling the pinning microstructure. Such high engineering critical current density, the highest value ever observed so far, establishes the essential role of REBa2Cu3Ox coated conductors for very high field magnet applications. We attribute such excellent performance to the dense c-axis self-assembled BaZrO3 nanorods, the elimination of large misoriented grains, and the suppression of big second phase particles in this ~3.2 μm thick REBa2Cu3Ox film.

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Progress in the Development and Construction of a 32-T Superconducting Magnet

Cited by 196 publications

References 26 publications

Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2

Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2

Contact resistance between two REBCO tapes under load and load cycles

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

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