Beam Current and Position Monitors at the NBS Linac

During the development of a new beam current and position display system, the quality of the signals and the convenience of the display have been of most importance. The quiality of the signals from the ferriteloaded toroids and solenoids has been improved by careful noise shielding from modulator and beam return currents, and by steps taken against beam-induced microwave signals. The beam display is a set of edgewise meters showing beam current and position along the linac: logarithmic scales for current and variable gain amuplifiers for the position channels allow convenient use of the system.