Quench Characteristics of bi2212 Solenoid Insert Coils in Background Field up to 20 T

Yang, Y.; Young, E.A.; Falorio, I.; Bailey, Wendell; Friend, C.M.; Twin, Andrew; Chappell, Steven P.

doi:10.1109/tasc.2010.2092742

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…Page 24 of 25 CONFIDENTIAL -FOR REVIEW ONLY SUST-100926.R1 Figure 10: Measured minimum quench energy at 4.2 K as a function of J o , the operating current density averaged over the conductor, for the epoxy--impregnated coil whose specifications were presented in the table 1, 13 cm long pieces of the same conductor used to fabricated table 1 coil and a wire with a diameter of 0. 8 mm and a design of 37 x 18 (reacted and tested as 13 cm long), an epoxy impregnated coil tested by Ye et al [16], and an epoxy impregnated coil tested by Yang et al [20]. Note that samples in this paper were tested using the 1 cm epoxy heater, whereas the coil of Ye et al [16] tested by a spiral heater wound from Nichrome wire (~1.5 cm in length), and the coil of Yang et al [20] tested by a thin film Constantan heater (40 mm x 1 mm x 20 mm x 22 cm).…”

Section: Resultsmentioning

confidence: 99%

“…8 mm and a design of 37 x 18 (reacted and tested as 13 cm long), an epoxy impregnated coil tested by Ye et al [16], and an epoxy impregnated coil tested by Yang et al [20]. Note that samples in this paper were tested using the 1 cm epoxy heater, whereas the coil of Ye et al [16] tested by a spiral heater wound from Nichrome wire (~1.5 cm in length), and the coil of Yang et al [20] tested by a thin film Constantan heater (40 mm x 1 mm x 20 mm x 22 cm). All of these wires were manufactured by OST and have the similar Ag/AgMg/Bi--2212 ratio.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi₂Sr₂CaCu₂O_xcoil

Shen

Turrioni

et al. 2015

Supercond. Sci. Technol.

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Small insert solenoids have been built using a multifilamentary Ag/Bi 2 Sr 2 CaCu 2 O x round wire insulated with mullite sleeve (~100 µm in thickness), and characterized in background fields to explore the quench behaviors and limits of Bi 2 Sr 2 CaCu 2 O x superconducting magnets, with an emphasis on assessing the impact of slow normal zone propagation on quench detection. Using heaters of various lengths to initiate a small normal zone, a coil was quenched safely more than 70 times without degradation, with the maximum coil temperature reaching 280 K. Coils withstood a resistive voltage of tens of mV for seconds without quenching, showing the high stability of these coils and suggesting that the quench detection voltage shall be greater than 50 mV to not to falsely trigger protection. The hot spot temperature for the resistive voltage of the normal zone to reach 100 mV increases from ~40 K to ~80 K with increasing the operating wire current density J o from 89 A/mm 2 to 354 A/mm 2 whereas for the voltage to reach 1 V, it increases from ~60 K to ~140 K, showing the increasing negative impact of slow normal zone propagation on quench detection with increasing J o and the need to limit the quench detection voltage to < 1 V. These measurements, coupled with an analytical quench model, were used to access the impact of the maximum allowable detection voltage and temperature upon quench detection on the quench protection, assuming to limit the hot spot temperature to <300 K.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi₂Sr₂CaCu₂O_xcoil

Shen

Turrioni

et al. 2015

Supercond. Sci. Technol.

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“…In this work, a 27 T NMR superconducting magnet system was designed together with superconducting shim coils. LTS wires of NbTi and Nb 3 Sn were used for the background magnet design, provided by Oxford Instruments [17,[23][24][25], the HTS insert magnet adopted Bi-2223 tape [26][27][28][29] and Nb 3 Sn was applied in the zonal shim coils located outside the background magnet and the tesseral shim coils located between the background and insert magnets utilized NbTi. The electromagnetic and mechanical performances for the insert magnet and shim coils were presented.…”

Section: Introductionmentioning

confidence: 99%

Insert magnet and shim coils design for a 27 T nuclear magnetic resonance spectrometer with hybrid high and low temperature superconductors

Wang¹,

Wang²,

Liu³

et al. 2020

Supercond. Sci. Technol.

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Extremely-high field nuclear magnetic resonance (NMR) spectrometer has the potential to significantly augment the resolution and sensitivity of the atomic resonance spectrum, which will largely boost the development of a range of scientific areas. The success of the extremely-high field NMR spectrometer depends on the development of superconducting magnet system to a great extent. A high-temperature superconducting (HTS) insert magnet and low-temperature superconducting (LTS) shim coils design scheme for a 27 T NMR spectrometer was proposed in this work. A LTS background magnet was used to generate a 15 T magnetic field in the central area and the designed HTS insert magnet was to contribute the remaining 12 T magnetic field. The HTS insert magnet adopted notch double-pancake (DP) optimization to improve the rough magnetic field distribution in the central area to a highly-homogeneous level, and shim compensation schemes was proposed for the hybrid magnet to eliminate the inhomogeneous magnetic field components in the practical fabrication. The HTS insert magnet design had a current margin 45.64% in terms of the perpendicular magnetic field intensity and the maximum hoop stress was reduced to 260 MPa with binding. There were totally 8 shim coils, including 2 Nb3Sn zonal coils located between the insert magnet and the background magnet and 6 NbTi tesseral coils placed outside the background magnet. The magnet system will be fabricated in the near future.

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“…The collaboration involved Manuscript the development of new LTS and HTS materials and the construction of a HF wide bore 20 T, 78 mm bore LTS magnet by Oxford Instruments (the IMPDAHMA test magnet) and a series of HTS insert coils which used Bi-2212 round wires manufactured by OST [6]. Tests were carried out with a 14 layer, 100 mm high Bi-2212 insert producing a total record field of 22.5 T at 4.2 K. Further tests used a pair of 6 layers, 300 mm high Bi-2212 inserts [7].…”

Section: Introductionmentioning

confidence: 99%

Quench Analysis of LTS and HTS Coils Used in Wide Bore Compact High Field Superconducting Magnets

Melhem

Ball

Chappell

2012

IEEE Trans. Appl. Supercond.

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Realizing a high field compact system for research applications requires a magnet constructed from low temperature superconductors (LTS) coils and insert coils developed from high temperature superconductor materials (HTS) like Bi-2212 round wires. The understanding of the quench behavior of such an integrated system is essential for the safe energisation and operation of compact high field magnets where quench management of LTS differ for those of HTS coils. In the present study, the quench behavior of the HTS coils and the LTS coils used to provide the background field were measured and analysed. The analysis is highly relevant to the design of high field wide bore magnets as well as ultra high field magnets using integrated LTS and HTS coils.Index Terms-Bi-2212 round wire, high field coils, high temperature superconductors, quench analysis, superconducting magnets, wind and react coils.

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Quench Characteristics of bi2212 Solenoid Insert Coils in Background Field up to 20 T

Cited by 17 publications

References 5 publications

High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi₂Sr₂CaCu₂O_xcoil

High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi₂Sr₂CaCu₂O_xcoil

Insert magnet and shim coils design for a 27 T nuclear magnetic resonance spectrometer with hybrid high and low temperature superconductors

Quench Analysis of LTS and HTS Coils Used in Wide Bore Compact High Field Superconducting Magnets

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Quench Characteristics of bi2212 Solenoid Insert Coils in Background Field up to 20 T

Cited by 17 publications

References 5 publications

High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi2Sr2CaCu2Oxcoil

High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi2Sr2CaCu2Oxcoil

Insert magnet and shim coils design for a 27 T nuclear magnetic resonance spectrometer with hybrid high and low temperature superconductors

Quench Analysis of LTS and HTS Coils Used in Wide Bore Compact High Field Superconducting Magnets

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High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi₂Sr₂CaCu₂O_xcoil

High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi₂Sr₂CaCu₂O_xcoil