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We found new signatures of the dynamical Casimir effect (DCE) in the contextof superconducting circuits. We show that if the recent experiment made byWilson {\it et al}, which brought the DCE into reality for the first time, isrepeated with slight modifications (for instance, different values for thecapacitance of the SQUID), three remarkable results will show up, namely: {\it(i)} a quite different spectral distribution for the created particles,deviating from the typical parabolic shape; {\it (ii)} an enhancement by afactor of approximately $5 \times 10^3 $ in the number of created particleswith half driven frequency of the effective moving mirror and {\it (iii)} anenhancement by a factor of $3 \times 10^2$ in the particle creation rate. Theseresults may guide the experimentalists in their search for alternative routesto observe the DCE in future experiments.

New signatures of the dynamical Casimir effect in a superconducting circuit