New Magnetic Pickup Probe for Charged Particle Beams

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Abstract
A new transmission-type current monitor of high sensitivity and accuracy has been developed in order to measure the total intensity of a pulsed beam. The method has been applied to a linac beam. This method causes no interference with the beam and its sensitivity is independent of the beam energy. The system essentially consists of a magnetic core and a feedback amplifier. The beam passes through a window of the magnetic core, and the signal induced in of a pickup coil wound on the core is amplified and negatively fed back to another coil wound on the same core. The total number of ampere-turns is thus automatically made equal that due to the beam current. The voltage generated across a resistor by this feedback current is proportional to the instantaneous total current of the beam and accurately reproduces the current waveform. An output voltage pulse of 0.5 volt can easily be obtained for a beam of 1 mA peak.

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