Analysis of AC Losses in a CS Conductor Sample for the ITER Project

Breschi, Marco; Bianchi, Marco; Ricchiuto, A.; Ribani, Pier Luigi; Devred, A.

doi:10.1109/tasc.2017.2785404

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…This confrontation shows the limit of the constraint applied to the original MPAS in fact, both low and high frequency cannot be fitted using the classical MPAS constraints (squared twist pitch ratio). In fact, last stage (5 th ) is decoupled from the four others and does not affect their behaviour anymore but guided by the new constraint rule (3). Doing this splitting inside MPAS, allow us to fit both high and low frequency at the same time with a better agreement (Fig.…”

Section: Confrontation With Mpasmentioning

confidence: 99%

Void Fraction Influence on CICCs Coupling Losses: Analysis of Experimental Results With MPAS Model

Chiletti

Duchateau

Topin

et al. 2020

IEEE Trans. Appl. Supercond.

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Modelling by analytical approach the coupling losses of CICCs used in tokamaks remains a challenge to be reliable. This is usually done using either CPU consuming numerical approaches or heuristic models such as MPAS now used for ITER. Experimental measurements of AC losses are performed at CEA using magnetization method on several JT-60SA TF type samples with various void fractions (25%-36%). Influence of void fraction on coupling losses is hard to heuristically model yet. We choose to develop an experimental protocol in order to measure coupling losses in a range of frequency relevant to fusion operation domain. AC losses model as MPAS is confronted to our JOSEFA experimental data. Conclusion and lessons will be taken into account for future work.

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Section: Confrontation With Mpasmentioning

confidence: 99%

Void Fraction Influence on CICCs Coupling Losses: Analysis of Experimental Results With MPAS Model

Chiletti

Duchateau

Topin

et al. 2020

IEEE Trans. Appl. Supercond.

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“…All the AC loss vs frequency curves corresponding to the internal tin-strand based conductors at virgin conditions increase with frequency in the whole range explored. This different behavior should be associated to higher values of contact resistances between strands, which shifts the peak of the losses towards higher values of frequency [19,23]. These results seem to indicate that differences in the contact pattern or contact resistance between strands may occur between the various conductors tested.…”

Section: Ac Lossesmentioning

confidence: 83%

“…The reference operating conditions for the CS conductor are the following: 12.4 T/45 kA at the end of burn and 13 T/40 kA at the initial magnetization of the DINA 2016-01 plasma scenario [15,16] In addition to measurements of current sharing temperatures (T cs ), the test campaign includes measurement of the critical current (I c ) at the beginning and at the end of the test campaign. The tests are completed by systematic AC loss measurements performed with background magnetic fields of 2 T and 9 T. These results can be used for the determination of the parameters needed for the computation of AC losses in CICCs by means of analytical [17][18][19][20] or numerical [21][22][23][24] models.…”

Section: Sultan Samples and Test Campaignmentioning

confidence: 99%

“…The AC losses are measured by means of a calorimetric method, based on the computation of the supercritical helium enthalpy difference between the temperature sensors located upstream and downstream of the HFZ, at 400 mm from its center (see figure 2). Since the heat deposition due to AC losses in these tests is not uniform along the conductor [23], the reference length of conductor selected for the computation of the energy per unit volume has to be selected; in the present analysis, in agreement with the procedure described in [36], the total deposited energy is divided by the volume of superconducting strands included in a 390 mm long region of the CS conductor. Further details on the calorimetric method applied for the analysis of AC losses in the SULTAN facility are reported in [12].…”

Section: Ac Lossesmentioning

confidence: 99%

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Performance tests of ITER CS conductor samples from series production

Breschi

Devred

Macioce

et al. 2023

Supercond. Sci. Technol.

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The ITER magnet system is one of the most sophisticated superconducting magnet systems ever designed, with a stored energy of 51 GJ. The coils are wound from Cable-in-Conduit Conductors (CICCs) made of superconducting and copper strands assembled into a multistage rope-type cable, inserted into a conduit of austenitic steel tubes. The ITER Central Solenoid (CS) works in pulsed mode, reaching a peak field of 13 T, thus allowing the induction of a high intensity current in the plasma of the ITER tokamak. This magnet consists of a stack of six modules which include around 125 t of Nb3Sn strands. The production of all CS conductors has been completed and module manufacturing is well underway; throughout the production phase, samples were cut at the extremities of the conductor unit lengths to undergo quality control tests. About 25% of the conductor short samples were tested in current and field at cryogenic conditions at the SULTAN facility in Villigen, Switzerland. This work reports the comparative analysis of the short samples set of test results.

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“…OUPLING losses modelling of CICC for fusion magnets remains a domain of interest as seen in [1], [2], [3], [4], [5] and are often obtained by using numerical codes as in [2] or [6]. We propose here an analytical general method applicable to any 𝑛-stage cable to reach this objective.…”

Section: Introductionmentioning

confidence: 99%

Analytical Coupling Losses Modelling With COLISEUM: Generalized Approach Upgrade to All Stages

Chiletti

Duchateau

Louzguiti

et al. 2021

IEEE Trans. Appl. Supercond.

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Predicting analytically the coupling losses generated in a cable for fusion magnets is still a significant challenge. Difficulties are related to the complex geometry of the system: several multi-strand stages embedded in one another with different twist pitches length, difficulty to model multiplets of strands, including compaction to the final shape. A two-stage analytical geometry based model (COLISEUM) has previously been developed at CEA. We try to extend it to any n-stage cables We detail here an iterative enhancement method to an n-stage model . We validated it against experimental data and shown that it is robust enough to fit our measured coupling losses. Finally, this upgraded model can be used to assess coupling losses in fusion nstage cables in a particularly precise way from only geometrical information and analytical tools .

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Analysis of AC Losses in a CS Conductor Sample for the ITER Project

Cited by 6 publications

References 16 publications

Void Fraction Influence on CICCs Coupling Losses: Analysis of Experimental Results With MPAS Model

Void Fraction Influence on CICCs Coupling Losses: Analysis of Experimental Results With MPAS Model

Performance tests of ITER CS conductor samples from series production

Analytical Coupling Losses Modelling With COLISEUM: Generalized Approach Upgrade to All Stages

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