  The physics potential of the Circular Electron Positron Collider (CEPC) can
be significantly strengthened by two detectors with complementary designs. A
promising detector approach based on the Silicon Detector (SiD) designed for
the International Linear Collider (ILC) is presented. Several simplifications
of this detector for the lower energies expected at the CEPC are proposed. A
number of cost optimizations of this detector are illustrated using full
detector simulations. We show that the proposed changes will enable to reach
the physics goals at the CEPC.
