Abstract
Experimental results are reported on hydrogen-cooled aluminum cryoresistive coils operating at frequencies greater than 1 Hz. It is shown that eddy current losses due to pulsing are minimized by using single-layer coils. Higher losses of cabled conductors and multilayer coils are caused by self-shielding of each conductor or layer from the AC fields from the other conductors. I/sup 2/R losses for cable is low if the wire size is much smaller than the skin depth (d<<2 mm). High-purity aluminum inductors pulsed at 1 Hz for a few minutes have storage efficiencies greater than 95%. High-modulus-low-density structural materials are required to limit conductor strain and resistivity degradation. Optimization of energy stored per unit mass is discussed, and conceptual designs of 300-MJ hydrogen cooled cryoresistive toroids and solenoids are examined.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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