Here we describe an electronic circuit capable of producing rapidly switched dc magnetic fields of up to with a rise time of and a pulse length variable from to more than , suitable for use in the study of magnetic field effects on radical pair (RP) reactions. This corresponds to switching the field on a time scale short relative to the lifetime of typical RPs and maintaining it well beyond their lifetimes. Previous experiments have involved discharging a capacitor through a low inductance coil for a limited time using a switching circuit. These suffer from decaying field strength over the duration of the pulse given primarily by the ratio of the pulse width to the RC constant of the circuit. We describe here a simple yet elegant solution that completely eliminates this difficulty by employing a feedback loop. This allows a constant field to be maintained over the entire length of the pulse.
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Brief Report| March 15 2007
Rapid rise time pulsed magnetic field circuit for pump-probe field effect studies
T. A. Salaoru;
T. A. Salaoru, Jonathan R. Woodward; Rapid rise time pulsed magnetic field circuit for pump-probe field effect studies. Rev. Sci. Instrum. 1 March 2007; 78 (3): 036104. https://doi.org/10.1063/1.2713434
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