Analyses and implications of V–I characteristic of PF insert conductor sample

Wesche, R.; Anghel, A.; Bruzzone, Pierluigi; Gislon, P.; Muzzi, L.

doi:10.1016/j.fusengdes.2005.06.158

Cited by 5 publications

(6 citation statements)

References 6 publications

(9 reference statements)

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“…The variation intensity scales with the nominal total current in BBIII ( fig.3 right) and it is a repeatable phenomenon, if the thermo-hydraulic conditions are the same. Such phenomenon has been previously observed also in the Poloidal Field Insert Sample, tested in the Sultan facility in 2004 [5], where considerable HP variations could be observed on both the wrapped leg side and, much more pronounced, on the un-wrapped leg side, where current re-distribution is more favoured. This further indicates that the observed signal variations are due to current transfer processes within the conductor cross-section.…”

Section: 2supporting

confidence: 70%

Current (re-)Distribution inside an ITER Full-Size Conductor: a Qualitative Analysis

Zenobio¹,

Muzzi²,

Turtù³

et al. 2006

J. Phys.: Conf. Ser.

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Section: 2supporting

confidence: 70%

Current (re-)Distribution inside an ITER Full-Size Conductor: a Qualitative Analysis

Zenobio¹,

Muzzi²,

Turtù³

et al. 2006

J. Phys.: Conf. Ser.

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“…Indeed, for the same quench current, a higher is observed at compared to [13]. The ITER design values for of the PF1&6 conductor at 45 kA, 6 T peak field, is 6.5 K, i.e.…”

Section: A DC Performancementioning

confidence: 84%

“…During runs at small, constant operating current and slowly increasing temperature, a slow change in the response of the Hall sensors indicates a smooth current re-distribution, [13], [18]. A small, saw-tooth ripple of Hall sensors signals at runs with high operating current is correlated with voltage spikes.…”

Section: Current Distributionmentioning

confidence: 96%

Test Results of the ITER PF Insert Conductor Short Sample in SULTAN

Bruzzone

Bagnasco²,

Bessette³

et al. 2005

IEEE Trans. Appl. Supercond.

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A short sample of the NbTi cable-in-conduit conductor (CICC) manufactured for the ITER PF insert coil has been tested in the SULTAN facility at CRPP. The short sample consists of two paired conductor sections, identical except for the sub-cable and outer wraps, which have been removed from one of the sections before jacketing. The test program for conductor and joint includes DC performance, cyclic load and AC loss, with a large number of voltage taps and Hall sensors for current distribution. At high operating current, the DC behavior is well below expectations, with temperature margin lower than specified in the ITER design criteria. The conductor without wraps has higher tolerance to current unbalance. The joint resistance is by far higher than targeted.Index Terms-Cable-in-conduit conductor, ITER, joint resistance, niobium-titanium, self-field induced quench.

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“…Otherwise the two conductors are identical. The DC performance of the PFIS conductors is limited by the occurrence of sudden take-offs above 35 kA in the left leg and above 45 kA in the right leg [6]. The values, found in the field range of 4 to 7 T, are 0.0116 (left leg) and 0.0145 T/kA (right leg).…”

Section: B Full-size Nbti Cic Conductorsmentioning

confidence: 97%

“…The conductor CON 3 shows an intermediate behavior, as indicated by the values listed in Table III. At sufficiently high overall current densities the phenomenon of sudden take-offs is generally observed in large CIC conductors [3]- [6], [10], [11]. Because of the interplay of the self-field and the cabling twist the local electric field varies strongly along the strand.…”

Section: A Sub-size Cic Conductorsmentioning

confidence: 99%

Comparison of the DC Performance of Full- and Sub-Size<tex>$rm NbTi$</tex>Cable-in-Conduit Conductors

Wesche¹,

Stepanov²,

Bruzzone³

2006

IEEE Trans. Appl. Supercond.

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The DC performances of three full-and five sub-size NbTi cable-in-conduit conductors, measured in the SULTAN test facility, are compared. In general, the self-field effect was found to cause sudden take-offs at high currents. In most of the investigated conductors the transition to sudden take-offs occurs for self-field contributions between 0.5 and 0.8 T. In the region of the sudden take-offs, the quench currents of the full-size conductors were found to be far below the critical current expected for the peak magnetic field. This behavior can be attributed to a current unbalance among the strands, which seems to be more pronounced at higher currents. Index Terms-Current distribution, fusion magnets, NbTicable-in-conduit conductors, quench behavior.

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Analyses and implications of V–I characteristic of PF insert conductor sample

Cited by 5 publications

References 6 publications

Current (re-)Distribution inside an ITER Full-Size Conductor: a Qualitative Analysis

Current (re-)Distribution inside an ITER Full-Size Conductor: a Qualitative Analysis

Test Results of the ITER PF Insert Conductor Short Sample in SULTAN

Comparison of the DC Performance of Full- and Sub-Size<tex>$rm NbTi$</tex>Cable-in-Conduit Conductors

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