  Analytic expressions for alternating current (ac) loss in radially arranged
superconducting strips are presented. We adopt the weight-function approach to
obtain the field distributions in the critical state model, and we have
developed an analytic method to calculate hysteretic ac loss in superconducting
strips for small-current amplitude. We present the dependence of the ac loss in
radial strips upon the configuration of the strips and upon the number of
strips. The results show that behavior of the ac loss of radial strips carrying
bidirectional currents differs significantly from that carrying unidirectional
currents.
