  The dynamical properties of hybrid normal metal/superconductor structures
have recently come into research focus both experimentally and theoretically.
Recent experimental studies of the coherent admittance $% Y(\omega )$ of SNS
rings as function of the phase difference $\phi _{0}$ are still not fully
understood. Here we concentrate on the linear response regime, calculating
$Y(\omega )$ by solving Usadel equations, linearised in electric field.
Although partially reproducing previously known results, we find qualitatively
different behaviour in the collisionless regime of $\tau _{in}^{-1}\ll \omega
\lesssim E_{Th}$ and high temperature $T\gg E_{Th}$ and low temperature
$T\lesssim E_{Th}$ near the minigap closing $\phi _{0}\sim \pi $. We find that
the dissipative part $\mbox{Re}Y(\omega )$ peaks when the minigap closes (at a
phase difference of $\pi $) even at high temperatures, when the equilibrium
supercurrent is fully suppressed.
