5.2 Capacitor Bank Current Monitoring Current measurements were made with Rogowski coils (with integrators). They were surplus units from the Princeton-Pennsylvania Accelerator. Calibration of these current transformers gave 5.00 mV/amp over a frequency range of 100 Hz to 20 KHz with a flat response. These are well suited for the 1 KHz frequencies found in the drive circuit. 5.3 SCR Trigger Pulse Recording As the bucket travels through the accelerator it interrupts evenly spaced beams of light to sense bucket position. This signal is then delayed before being used to fire the group of four SCR's (see APPENDIX I). These pulses (width) from the optical sensors of each phase are fed to a fan in circuit which is a "massive OR”. This results in all of the pulses appearing on a single channel that can be easily recorded. A typical output for the accelerator is shown in Fig. 5.2. Velocity and acceleration of the bucket can be obtained from this information. In addition, a pulse counter can be used to quickly check that all optical sensor circuits are properly functioning by counting the number of pulses. The fan in circuit can be seen in Fig. 1.5 at the end of the accelerator in the aluminum box. Along with the pulse recording system there is an associated "firing simulator" circuit. It is used to generate a sequence of pulses that electrically simulate the motion of a bucket through the accelerator. This permits easy and routine testing of all the SCR and
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