Test results of SeCRETS, a stability experiment about segregated copper in CICC

Bruzzone, Pierluigi; Fuchs, A.M.; Stepanov, B.; Vécsey, G.; Zapretilina, E.

doi:10.1109/77.920250

Cited by 24 publications

(22 citation statements)

References 5 publications

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“…These tests were repeated for several settings of operating current, operating temperature and helium massflow. Details on the experiment and the main results can be found in [2], [3]. In this paper we analyze the main results focusing on the dependence of transient stability on operating conditions such as current, temperature margin and helium massflow.…”

Section: T He Segregated Copper Ratio Experiments Onmentioning

confidence: 99%

“…The calculation of the Joule heat contribution was thus modified to model the effect of a finite . To this aim the electric field in the superconductor was modeled as is customary using a power law approximation: (3) where is the electrical field used for the definition of the critical current , is the current in the superconductor (i.e., excluding the current shared by the stabilizer) and is the exponent of the power law. The values taken in the simulations are V/cm and .…”

Section: Superconductor Propertiesmentioning

confidence: 99%

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Transient stability analysis of the SeCRETS experiment in SULTAN

Marinucci¹,

Bottura

Bruzzone

2002

IEEE Trans. Appl. Supercond.

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Abstract-We present here the results of the analysis of the stability experiment SeCRETS, performed on two Nb 3 Sn cable-inconduit conductors with the same amount of total copper stabilizer, but different degree of segregation. The model used for the analysis, including superconducting strands, conductor jacket and helium, is solved with the code Gandalf™. We obtain a qualitative agreement of simulation results and experimental values. The simulation results confirm that in the operation regime explored in the experiment the segregated copper is not effective for stability. The details of the current sharing and the approximation taken for the transient heat transfer are shown to be critical for the interpretation.

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Section: T He Segregated Copper Ratio Experiments Onmentioning

confidence: 99%

Section: Superconductor Propertiesmentioning

confidence: 99%

Transient stability analysis of the SeCRETS experiment in SULTAN

Marinucci¹,

Bottura

Bruzzone

2002

IEEE Trans. Appl. Supercond.

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“…Here we analyse the details of a transient stability experiment performed in the SULTAN facility on a mid-size Nb 3 Sn Cable-in-Conduit Conductor [3][4][5]. The experiment was mainly aimed at verifying that the current can be shared among strands following a localised normal transition.…”

Section: Introductionmentioning

confidence: 99%

“…The main conductor characteristics are summarised in TABLE 1, while details can be found elsewhere [4][5]. The sample, an hairpin of approximately 3 m length (6 m total cable length) also shown schematically in FIG 1, was placed in the SULTAN split solenoid and extensively tested to determine its DC and AC characteristics [5]. A particularity of relevance is that the sample showed a broadening of the resistive transition after several thousands powering cycles, with a power-law index n as low as 6 at 10 T, 4.6 K [6].…”

Section: Introductionmentioning

confidence: 99%

“…The cable, whose cross section is shown in FIG 1, consists of 112, 0.82 mm diameter, Cr-plated Nb 3 Sn strands and of 16, 1.1 mm pure Cu strands cabled in a (1+7) x 4 x 4 pattern. The main conductor characteristics are summarised in TABLE 1, while details can be found elsewhere [4][5]. The sample, an hairpin of approximately 3 m length (6 m total cable length) also shown schematically in FIG 1, was placed in the SULTAN split solenoid and extensively tested to determine its DC and AC characteristics [5].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Current Redistribution in a CICC Under Transient Heat Pulses

Bottura¹,

Bruzzone²,

Marinucci³

2004

AIP Conference Proceedings

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We have performed experiments and simulations of the current distribution process in a CICC with the aim to understand better the coupled thermal, hydraulic and electric process that leads to a stable or unstable transient cable behaviour. The cable, wound from 128 Nb3Sn and pure copper strands, has been tested in the SULTAN facility. A resistive heater, glued on the jacket of the conductor, has been used to start the transient, and the response has been monitored with arrays of Hall plates. In this paper we report the results of simulations, especially the computed Hall signals, and compare them to the experimental data. Based on the experimental results and their interpretation we postulate that large temperature gradients must develop in the helium stream in the cable cross sections during the transient heat pulse. ABSTRACTWe have performed experiments and simulations of the current distribution process in a CICC with the aim to understand better the coupled thermal, hydraulic and electric process that leads to a stable or unstable transient cable behaviour. The cable, wound from 128 Nb 3 Sn and pure copper strands, has been tested in the SULTAN facility. A resistive heater, glued on the jacket of the conductor, has been used to start the transient, and the response has been monitored with arrays of Hall plates. In this paper we report the results of simulations, especially the computed Hall signals, and compare them to the experimental data. Based on the experimental results and their interpretation we postulate that large temperature gradients must develop in the helium stream in the cable cross sections during the transient heat pulse.

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Critical bending wavelengths associated with current sharing temperature degradation in multistage twisted Nb3Sn cable CICC

Kwon

2022

Cryogenics

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Test results of SeCRETS, a stability experiment about segregated copper in CICC

Cited by 24 publications

References 5 publications

Transient stability analysis of the SeCRETS experiment in SULTAN

Transient stability analysis of the SeCRETS experiment in SULTAN

Analysis of Current Redistribution in a CICC Under Transient Heat Pulses

Critical bending wavelengths associated with current sharing temperature degradation in multistage twisted Nb3Sn cable CICC

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