Abstract
AC losses determined by ac and dc magnetization and calorimetric techniques in a wide variety of twisted and untwisted in-situ composites are discussed. In all conductors studied so far the full penetration hysteresis losses are much larger than would be expected based on the filament size. The effect of twist and the anisotropy of magnetization as a function of the superconductor volume fraction has been used to characterize the transverse coupling between filaments which gives rise to the increased loss. Eddy current losses have been observed by electronic wattmeter and calorimeter techniques and are found to be small.
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