A macroscopic model for coupling current losses in cables made of multistages of superconducting strands and its experimental validation

Turck, B.; Zani, L.

doi:10.1016/j.cryogenics.2010.05.001

Cited by 35 publications

(29 citation statements)

References 11 publications

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“…For the CICC a model with partial shielding of zones (MPAS) with different time constants has been presented in [2] to describe the energy deposition due to coupling losses in ac-mode. When the paper in Cryogenics was written, the time constant of the basic strand was thought to be 10 ms.…”

Section: Basis For a Theoretical Model Of Stability Tests In Sultanmentioning

confidence: 99%

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Stability of a cable in conduit conductor under fast magnetic field variations

Duchateau

Turck

Lacroix

et al. 2012

IEEE Trans. Appl. Supercond.

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Under fast magnetic field variations, ac losses are deposited in a Cable in Conduit Conductor (CICC). The corresponding power losses are transferred to helium thanks to the high wetted perimeter of the conductor. The critical energy of the CICC can be expected to be proportional to the high volumetric heat capacity of helium and to the temperature margin. To confirm the expectations, stability tests under a transversal pulsed magnetic field were performed in the Sultan test facility on a prototype JT-60SA conductor sample. The shape of the magnetic field variation as a function of time is a truncated sinusoid. The experimental results are not totally in agreement with expected behavior on two particular points: -the deposited energy in the conductor as a function of the pulsed field amplitude, measured by calorimetry, deviates from the expected quadratic behavior for coupling losses. The deviation is also increasingly dependent on the transport current. -at a given Sultan background magnetic field, the critical energies at low temperature margins are reduced in comparison with expected values. An explanation based on the saturation of parts of the cable is proposed.

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Section: Basis For a Theoretical Model Of Stability Tests In Sultanmentioning

confidence: 99%

“…4. It is possible to predict, for a given , the energy deposition with the MPAS model according to formula (2).…”

Section: A Calibration At 45 K Withmentioning

confidence: 99%

Stability of a cable in conduit conductor under fast magnetic field variations

Duchateau

Turck

Lacroix

et al. 2012

IEEE Trans. Appl. Supercond.

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“…A recent in depth analysis, which better accounts for the local properties of the JT-60SA CICC, leads to a system of zones with 5 time constants with relatively small attributed volume fractions (see Table III). It should not be forgotten that this model was proposed for the interpretation of AC losses measurements on the first TF conductor design (see [6] and [7] for details). In this study, we shall stick to this design which is the only one tested so far.…”

Section: A Model For the Powermentioning

confidence: 98%

“…The loss due to the parallel component alone remains small (1600 ). If were larger than , the losses would increase significantly, as the power loss would become: (6) There are regions of the winding where the strands are subjected both to a parallel component of 1 T and to a normal component of 0.2 T (curved regions at end of straight parts). One of the main reasons to avoid complete saturation of the strand by the parallel component is to limit the reaction of the composite to the normal component when in that situation.…”

Section: Analytical Model For the Interaction Between Transverse mentioning

confidence: 99%

“…A model with partial shielding of zones (MPAS) with several time constants has been presented in [6] to describe the energy deposition due to coupling losses in ac-mode. A recent in depth analysis, which better accounts for the local properties of the JT-60SA CICC, leads to a system of zones with 5 time constants with relatively small attributed volume fractions (see Table III).…”

Section: A Model For the Powermentioning

confidence: 99%

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Impact of a Plasma Disruption on the Magnetic Field Variations and Heat Deposition in the TF Conductor of JT-60SA

Torre

Duchateau

Turck

et al. 2012

IEEE Trans. Appl. Supercond.

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During a plasma disruption a complex map of magnetic field variation is generated along the JT-60SA TF conductor. The current variations associated with a symmetric plasma disruption are modeled in JT-60SA, on the basis of a circuit approach. The main components of the circuit model are: the poloidal field coils, the plasma represented by circular filaments, the vacuum vessel, and the stabilizing plates. The disruption induces currents in all elements of the circuit model which produce a variation of the field map. At the location of the TF coil, this field change can be assessed and used for ac losses and stability calculations on the TF conductor. An analysis of the map will allow estimating the field change time constants and investigating which points the JT-60SA TF conductor experience the most severe field variations. Based on a recent multi-constant AC losses model for the JT-60SA TF conductor, an analytical model of stability is presented to describe the temperature increase in the cable after a plasma disruption, taking into account the heat transfer to helium during the power losses deposition. A discussion will be introduced about a possible influence of the synchronous parallel field variations, which may saturate the strand filaments and increase the heat losses dissipation.

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