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A recent study on AC loss calculation in different operating regimes of relevance for ITER plasma control has shown that AC loss calculations can be performed on a model with a level of complexity and completeness not achieved so far [L. Bottura, P Bruzzone, J.B. Lister, C Marinucci, A Portone, Computation of AC losses in the ITER magnets during fast field transients, IEEE Trans Appl Supercond 17 (2) (2007) 2438-2441] The model developed is however too large and computationally expensive for the inclusion in a fast control optimization procedure For this reason a second study was launched aiming at developing a simplified calculation method. The simplified calculation method described here that provides faster estimates of AC loss in the ITER coils The method is based on a Fourier decomposition of the field excitation, calculation for ...
The discovery of an upward counter flow of helium in the outer annulus of the vertically oriented and top-to-bottom cooled ITER PF-FSJS (Poloidal Field Coil-Full Size Joint Sample) in 2002 led to closer investigations of the effect because it may lead to a reduction of the operational margin of the superconductor used in the ITER environment. Recently, further thermo-hydraulic experiments were carried out on the TFAS2 sample (Toroidal Field Advanced Strand sample 2) with the intent to asses the effect in detail. First investigations confirmed the initial assumption that the origin of the effect lies in the buoyancy of the heated, and thus less dense, helium in the outer annulus of the cable. The helium there is in good contact with the superconducting strands heated by neutron irradiation, ac losses or heat influx, but is thermally and...
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