Plunging Faraday Cup System and a Slit System for Use in the Zero Gradient Synchrotron Short Straight Sections

Each short straight section of the Zero Gradient Synchrotron (ZGS) contains mechanisms for positioning three beam detectors. The mechanisms are noteworthy because of their unique target fast stroke length adjustment capabilities. One detector consists of a solid plate containing a long, horizontal slit. Plate position is vertically adjustable over a wide range. Beam currents to the plate flow through a coaxial cable to a signal detecting circuit. The second detector is a vertical square bar that is plunged upward. The plunge distance and horizontal position of the bar are continuously adjustable over the whole aperture. A coaxial cable connected to the bar carries beam currents to a signal detecting circuit. The third device is a vertical segmented assembly of linearly arranged detectors that can be plunged downward. The plunge distance and the horizontal position of the segmented assembly are continuously adjustable over the whole aperture. Each insulated segment is connected to resistor networks that provide voltages proportional to the total current to the segments and to the weighted function of the current to each segment. The vertical position of the beam can be derived from these voltages.