An internal timing probe for use in the MSU K1200 cyclotron

A probe was installed in the K1200 to measure the internal beam time structure as a function of radius. Using the fast rise times of a Si detector, which was specially cut to extend the active area to within 150 /spl mu/m of the detector edge, the time of arrival of the heavy ions on the detector is measured with respect to the accelerating RF voltage. Limited to count rates of several kHz, use of the detector requires attenuation of the injected beam, and permits studies of single particle beam dynamics.