Synchrotron particle beam position information transmission system - conveys from many probes to one remote control unit

摘要

The particles are accelerated in the synchrotron in a beam of which the position is checked by means of many X and Y pairs of probes. Because of the high particle speeds, a basic signal of 200 MHz is detected at a pair of probes, with the signal larger if the beam travels nearer a probe and smaller if further away. The control system operates to keep the signals from both X probes and both Y probes equal, which indicates that the beam is central. The central control generates a 400 KHz clock, using a crystal oxide oscillator and frequency dividers. This is transmitted on symmetrical lines to each probe control unit, where the monitoring of the X probe pair is switched at 400 KHz.