A Fast-Response Logarithmic Electrometer for Pulse-Reactor Experiments

The response time of a logarithmic electrometer was improved for pulse reactor experiments requiring long detector cables. A new phase-compensation technique was used in the circuit and it is based on the idea that a current variable resistance inserted between a detector cable and the input terminal of the logarithmic electrometer recovers the phase lag caused by the input capacitance. This stable and fast-response logarithmic electrometer was successfully applied to transient power measurements of the one-shot pulse-reactor "YAYOI."