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Cold atom experiments commonly use broad magnetic Feshbach resonances tomanipulate the interaction between atoms. In order to induce quantum dynamicsby a change of the interaction strength, rapid ($\sim\mu s$) magnetic fieldchanges over several tens of Gauss are required. Here we present a compactdesign of a coil and its control circuit for a change of the magnetic field upto $36G$ in $3\mu s$. The setup comprises two concentric solenoids with minimalspace requirements, which can be readily added to existing apparatuses. Thisdesign makes the observation of non-equilibrium physics with broad Feshbachresonances accessible.

A compact and fast magnetic coil for the interaction manipulation of quantum gases with Feshbach resonances