Effective thermal conductivity of the conductor insulation of the ITER toroidal field model coil at operation temperature

The ITER toroidal field model coil project

“…A similar result was obtained with the computer code MAGS where also the thermal conductivity of the conductor insulation had to be (drastically) reduced by a factor of 8 compared to the nominal material data [122]. This is shown in Fig.…”

“…The two test campaigns of Phases 1 and 2 resulted in the fact that a significant amount of ITERrelevant information, ranging from the current sharing temperature to AC losses, could be extracted from the analysis of the TFMC performance. To make this possible, notwithstanding the fact that all diagnostics were located outside the coil, a suitable understanding of the thermal-hydraulics in the coil was needed [83,78,122,123].…”

Thermal-Hydraulic Issues in the ITER Toroidal Field Model Coil (TFMC) Test and Analysis

“…The correlation in [16] (deduced from spiral data) fits very well the CSMC sample. 4 The TFMC Phase I and Phase II data are reported in terms of Ap/L in FIG 5. In view of the above-mentioned inconsistency, and of the good agreement between the correlation in [16] for f H and the CSMC sample data, we use the same correlation for f H for the analysis of the TFMC data, for the time being (i.e., until possible curvature effects have been quantified). Those data can then be fitted with very good agreement over a wide range of mass flow rates (see FIG 5) by using the Katheder correlation for the bundle friction with an ad-hoc multiplier, albeit much larger (~ 2.4) than for the CSMC sample.…”

“…The two test campaigns of Phase I and of Phase II resulted in that a significant amount of ITER-relevant information, ranging from current sharing temperature to AC losses, could be extracted from the analysis of the TFMC performance. To make this possible, notwithstanding the fact that all diagnostics were located outside the coil, a suitable understanding of the thermal-hydraulics in the coil was needed [2][3][4][5].…”

“…Here we concentrate on a sub-set of specifically thermal-hydraulic issues of the TFMC test and analysis: 1) the analysis of the relation between pressure drop (Ap) and mass flow rate (dm/dt) in the different pancakes, particularly the ones equipped with heaters, where a dedicated differential pressure measurements was available (a first analysis of these data for Phase I was given in [6]); 2) a simple analysis of quench initiation and propagation in the coil (without making use of complex simulation tools). Other items of relevant thermalhydraulic interest have already been considered elsewhere (e.g., the issue of heat generation and exchange in the joints [7,8], or the above mentioned studies of the so-called safety discharge [4,5], or the effects of the resistive heaters on the helium dynamics in the coil [9]).…”