HTS Coil Test Facility in a Large Bore 20 T Resistive Magnet at LNCMI

Miyoshi, Yasuyuki; Chaud, X.; Debray, F.; Vincent, Benjamin; Tixador, Pascal; Lécrevisse, Thibault; Rey, J. M.; Oguro, Hidetoshi; Awaji, Satoshi; Watanabe, Kazuo; Nishijima, G.; Kitaguchi, Hitoshi

doi:10.1109/tasc.2012.2234317

Cited by 14 publications

(12 citation statements)

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“…a quench heater embedded in the coil winding and an array of voltage taps in its vicinity. The high current test probe, the high speed data acquisition techniques, the construction of a prototype coil ("HTS2") and the measurement results from T 2LOr2A-01 another coil have been reported earlier [12], [17]. We report here the outcome of the recent quench propagation tests on HTS2 performed in Grenoble.…”

Section: Quench Propagation In Hts Pancake Coil Under Magnetic Fieldmentioning

confidence: 93%

Performance Tests of Prototype High-Field HTS Coils in Grenoble

Miyoshi¹,

Badel²,

Chaud³

et al. 2015

IEEE Trans. Appl. Supercond.

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Abstract--Longitudinal and transverse quench propagation tests were performed at LNCMI high field test facility on instrumented double pancake coils fabricated by CEA-Saclay using co-wound HTS tapes. Energy deposited on an embedded heater initiated a quench and its subsequent propagations. Following the resulting thermo-mechanical analysis, a conductor design with stacked HTS tapes co-wound with stabilizers was conceived. A 10-turn demonstrator racetrack coil has been fabricated from the stacked HTS conductor with an aim to investigate the operation margin of an HTS coil in a background magnetic field misaligned from the coil axis as expected for the operating condition of an accelerator magnet insert.A test set up with a high current capacity up to 3 kA and angular variability that utilizes a room temperature ø 376 mm bore 10 T resistive magnet at LNCMI in Grenoble has been built. The performances and operation margin of the racetrack coil were investigated. IndexTerms-High-field magnet, High-temperature superconductors (HTS), HTS coils, HTS quench propagation,

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Section: Quench Propagation In Hts Pancake Coil Under Magnetic Fieldmentioning

confidence: 93%

Performance Tests of Prototype High-Field HTS Coils in Grenoble

Miyoshi¹,

Badel²,

Chaud³

et al. 2015

IEEE Trans. Appl. Supercond.

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“…Critical current measurements of several different tapes under various high magnetic fields can be found in the literature but they are mostly measured under specific magnetic field orientation, especially under parallel and perpendicular fields [19]. Some other orientations between these two specific cases can be also found but most of the time, the width of the tape is reduced in order to accommodate the measurement probe limitation [20,21].…”

Section: Experimental Setup and Measurement Probementioning

confidence: 99%

REBCO tape performance under high magnetic field

Benkel

Miyoshi

Chaud

et al. 2017

Eur. Phys. J. Appl. Phys.

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Abstract. New improvements in high temperature superconductors (HTS) make them a promising candidate for building the next generation of high field magnets. As the conductors became recently available in long length, new projects such as NOUGAT (new magnet generation to generate Tesla at low cost) were started. This project aims at designing and building an HTS magnet prototype generating 10 T inside a 20 T resistive magnet. In this configuration, severe mechanical stress is applied on the insert and its extremities are subject to a high transverse component of the field. Because the conductor has anisotropic properties, it has to be studied carefully under similar conditions as the final prototype. First, this paper presents both the NOUGAT project and its context. Then, it shows the experimental results on short HTS tapes studied under high magnetic field up to 23 T with varying orientation. These results allow validating the current margin of the prototype. Finally, a first wound prototype is presented with experimental results up to 200 A under 16 T.

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“…2) for £170 mm bore 20 T magnet at LNCMI. This probe has a longer sample length 90 mm and its high current capacity has been verified [20], and so the results obtained will be compared with those from the two new probes for the measurement validation.…”

Section: Experimental Set Upmentioning

confidence: 99%

“…The experimental procedure is described in [20] and it is performed in liquid helium bath. The transport current is simply ramped up to I c determined at the voltage criterion E c = 1 lV/cm with a ramp speed typically 1/20 of I c per second, a sufficient speed to obtain enough data points while avoiding heating to change the sample temperature.…”

Section: Experimental Set Upmentioning

confidence: 99%

“…For Fujikura conductor, the measurements were performed on two pieces of conductors from the same lot (14-0035), and only data series with B \ were obtained since I c with B k were greater than the capacity of 1.2 kA current source used. The data from SuperPower, presented here for comparison purpose, were taken from two different lots, namely M3-873 for 30 mm samples and M3-725 for the 90 mm samples measured in [20]. For both conductors, we obtained good agreement of in-field data that give confidence in our short sample measurement probes in high field beyond 20 T. The sample width and thickness have reduced somewhat in Fujikura-new conductor, and in current density by the whole conductor cross-section, J e , we observe an increase in performance (Fig.…”

Section: Coated Conductormentioning

confidence: 99%

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