A Cyclotron Beam Current Integrator and Recorder

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Abstract
The instrument described was developed to integrate and record the Massachusetts Institute of Technology Cyclotron beam current, for both the probe and the external target. Probe target currents are found by use of voltages developed by a thermopile which measures the temperature rise of the target cooling water; external target currents are measured directly by the voltage drop across a 10‐ohm resistor, in parallel with the 10‐ohm input impedance of the integrator itself, connected between the external target and ground. The instrument is essentially a stable, high sensitivity, linear a.c. amplifier, with a low impedance input, and a mechanical inverter for the d.c. input signal. Integration is accomplished by a standard a.c. watthour meter, and recording by means of a 5‐ma, d.c. pen recorder. The amplified signal is also used to operate a warning system to indicate audibly a change in the beam current.
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