Numerical investigation of the current distribution in cable-in-conduit conductors using lumped network models

Meinecke, C.; Miri, A.M.; Petranovic, R.

doi:10.1109/77.920395

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…Carrying out parametric studies on full size ITER CICC sections would be desirable, but time and cost considerations render this option unpractical. Numerical modelling would offer a solution and much effort has been spent on simulation tools in the past [6,[11][12][13][14][15], and it was also the reason to develop JackPot-AC [16]. This model is able to calculate the coupling currents in a CICC, by first calculating the trajectories of all its strands.…”

Section: Introductionmentioning

confidence: 99%

Full-scale calculation of the coupling losses in ITER size cable-in-conduit conductors

Lanen¹,

Nugteren²,

Nijhuis³

2011

Supercond. Sci. Technol.

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With the numerical cable model JackPot it is possible to calculate the interstrand coupling losses, generated by a time-changing background and self-field, between all strands in a cable-in-conduit conductor (CICC). For this, the model uses a system of equations in which the mutual inductances between all strand segments are calculated in advance. The model works well for analysing sub-size CICC sections. However, the exponential relationship between the model size and the computation time make it unpractical to simulate full size ITER CICC sections. For this reason, the multi-level fast multipole method (MLFMM) is implemented to control the computation load. For additional efficiency, it is written in a code that runs on graphics processing units, thereby utilizing an efficient low-cost parallel computation technique. A good accuracy is obtained with a considerably fast computation of the mutually induced voltages between all strands. This allows parametric studies on the coupling loss of long lengths of ITER size CICCs with the purpose of optimizing the cable design and to accurately compute the coupling loss for any applied magnetic field scenario.

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Section: Introductionmentioning

confidence: 99%

Full-scale calculation of the coupling losses in ITER size cable-in-conduit conductors

Lanen¹,

Nugteren²,

Nijhuis³

2011

Supercond. Sci. Technol.

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“…A large effort has been devoted in recent years to the development of codes to analyse current distribution and AC losses in superconducting multi-strand cables. The main difference between the developed codes is the approach used to describe the electromagnetic phenomena: a lumped parameter circuit description [8][9][10][11][12][13][14] or a distributed parameter circuit description [15][16][17]. Each approach has advantages and disadvantages, which will not be discussed in this paper.…”

Section: Introductionmentioning

confidence: 99%

THELMA code electromagnetic model of ITER superconducting cables and application to the ENEA stability experiment

Ciotti

Nijhuis

Ribani

et al. 2006

Supercond. Sci. Technol.

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The new THELMA code, including a thermal-hydraulic (TH) and an electromagnetic (EM) model of a cable-in-conduit conductor (CICC), has been developed. The TH model is at this stage relatively conventional, with two fluid components (He flowing in the annular cable region and He flowing in the central channel) being particular to the CICC of the International Thermonuclear Experimental Reactor (ITER), and two solid components (superconducting strands and jacket/conduit). In contrast, the EM model is novel and will be presented here in full detail. The results obtained from this first version of the code are compared with experimental results from pulsed tests of the ENEA stability experiment (ESE), showing good agreement between computed and measured deposited energy and subsequent temperature increase.

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“…Some of these codes are based on lumped parameters circuit models of cables [5][6][7][8][9], while others rely on distributed parameters models [10][11][12]. Despite this large experimental and theoretical effort, there is a lack of simple quantitative formulae for the estimation of current non uniformities in real-scale conductors.…”

Section: Introductionmentioning

confidence: 99%

An analytical benchmark for the calculation of current distribution in superconducting cables

2003

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The validation of numerical codes for the calculation of current distribution and AC loss in superconducting cables versus experimental results is essential, but could be affected by approximations in the electromagnetic model or incertitude in the evaluation of the model parameters. A preliminary validation of the codes by means of a comparison with analytical results can therefore be very useful, in order to distinguish among different error sources. We provide here a benchmark analytical solution for current distribution that applies to the case of a cable described using a distributed parameters electrical circuit model. The analytical solution of current distribution is valid for cables made of a generic number of strands, subjected to well defined symmetry and uniformity conditions in the electrical parameters. The closed form solution for the general case is rather complex to implement, and in this paper we give the analytical solutions for different simplified situations. In particular we examine the influence of different boundary conditions, the effect of a localised resistance in the middle of the cable such as in the case of quench and the effects of localized time dependent magnetic fluxes acting on the cable. AbstractThe validation of numerical codes for the calculation of current distribution and AC loss in superconducting cables versus experimental results is essential, but could be affected by approximations in the electromagnetic model or incertitude in the evaluation of the model parameters. A preliminary validation of the codes by means of a comparison with analytical results can therefore be very useful, in order to distinguish among different error sources. We provide here a benchmark analytical solution for current distribution that applies to the case of a cable described using a distributed parameters electrical circuit model. The analytical solution of current distribution is valid for cables made of a generic number of strands, subjected to well defined symmetry and uniformity conditions in the electrical parameters. The closed form solution for the general case is rather complex to implement, and in this paper we give the analytical solutions for different simplified situations. In particular we examine the influence of different boundary conditions, the effect of a localised resistance in the middle of the cable such as in the case of quench and the effects of localized time dependent magnetic fluxes acting on the cable.

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Numerical investigation of the current distribution in cable-in-conduit conductors using lumped network models

Cited by 9 publications

References 5 publications

Full-scale calculation of the coupling losses in ITER size cable-in-conduit conductors

Full-scale calculation of the coupling losses in ITER size cable-in-conduit conductors

THELMA code electromagnetic model of ITER superconducting cables and application to the ENEA stability experiment

An analytical benchmark for the calculation of current distribution in superconducting cables

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