A general model for thermal, hydraulic and electric analysis of superconducting cables

Bottura, L.; Rosso, Carlo; Breschi, Marco

doi:10.1016/s0011-2275(01)00019-4

Cited by 134 publications

(65 citation statements)

References 16 publications

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“…In this paper we report the main outcome of the analysis performed with the code THEA™ (Thermal, Hydraulic and Electric Analysis) of CryoSoft [3] in support to the interpretation of the experimental results. The main line of investigation pursued here is to examine the conditions under which an increase in interstrand resistance can lead to premature current sharing, resistive voltage development and a decrease of the cable exponent.…”

supporting

confidence: 57%

Application of the code THEA to the CONDOPT experiment in SULTAN

Bottura

Marinucci²,

Bruzzone³

2002

IEEE Trans. Appl. Supercond.

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Abstract-The CONDOPT (CONDuctor OPTimization) experiment has been recently completed in SULTAN. The current sharing behavior of Nb 3 Sn samples was assessed as a function of the number of cyclic loads experienced during current sweeps in a 10 T background field. We present here results of a computer analysis performed with the code THEA™ (for consistent Thermal, Hydraulic and Electric Analysis) in support of the interpretation of the experimental results. We focus in particular on the critical current and current sharing temperature runs, providing details on the features and effects of current distribution among cable sub-stages.

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supporting

confidence: 57%

Application of the code THEA to the CONDOPT experiment in SULTAN

Bottura

Marinucci²,

Bruzzone³

2002

IEEE Trans. Appl. Supercond.

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“…To understand the physics underlying the response of the cable to the heating pulse we have simulated the transient using a 1-D numerical model that allows an arbitrary subdivision of the cable cross section in components with uniform properties and the simultaneous solution of the coupled electrical, thermal and hydro-dynamic problem [10]. We have modelled the current distribution using four equal super-strands corresponding to the last-but-one cabling stage.…”

Section: Description Of the Modelmentioning

confidence: 99%

“…The thermal components are coupled by thermal resistances that simulate the heat transfer at the contact surfaces. Finally, as discussed later, it is important to consider that also the helium state is not uniform in the cable cross Further details on the model, and in particular the governing equations in each domain (current, temperature, helium state and flow) and the solution methods can be found elsewhere [10].…”

Section: Description Of the Modelmentioning

confidence: 99%

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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“…The model for the current distribution in a superconducting cable is based on the distributed parameters circuit description discussed in detail in [3][4][5][6]. The model assumes that each strand carries a current uniformly distributed in its cross section, and thus neglects the coupling currents that flow inside each strand among the twisted superconducting filaments.…”

Section: Model Descriptionmentioning

confidence: 99%

“…In order to study current distribution phenomena in multistage superconducting cables, we have developed in the past years a distributed parameters model that allows to calculate current distribution in very long cables used in magnets due to a substantial decrease of the number of the unknowns of the problem [1][2][3][4][5][6]. The model is a special case of a multi-conductor transmission line for which standard theory is available in the field of electrical engineering.…”

Section: Introductionmentioning

confidence: 99%

Analytical solution for the current distribution in multistrand superconducting cables

Bottura

Breschi

Fabbri

2002

Journal of Applied Physics

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Current distribution in multistrand superconducting cables can be a major concern for stability in superconducting magnets and for field quality in particle accelerator magnets. In this paper we describe multistrand superconducting cables by means of a distributed parameters circuit model. We derive a system of partial differential equations governing current distribution in the cable and we give the analytical solution of the general system. We then specialize the general solution to the particular case of uniform cable properties. In the particular case of a two-strand cable, we show that the analytical solution presented here is identical to the one already available in the literature. For a cable made of N equal strands we give a closed form solution that to our knowledge was never presented before. We finally validate the analytical solution by comparison to numerical results in the case of a step-like spatial distribution of the magnetic field over a short Rutherford cable, both in transient and steady state conditions.

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A general model for thermal, hydraulic and electric analysis of superconducting cables

Cited by 134 publications

References 16 publications

Application of the code THEA to the CONDOPT experiment in SULTAN

Application of the code THEA to the CONDOPT experiment in SULTAN

Analysis of Current Redistribution in a CICC Under Transient Heat Pulses

Analytical solution for the current distribution in multistrand superconducting cables

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