Beam Position Monitors & Fast Orbit Feedback System

What is it?

Synchrotron’s machine requires a stability of the beam position in the order of hundreds of nanometers, monitored through Beam Position Monitors (BPMs). Such stability is accomplished with a dedicated system, known as Fast Orbit Feedback System (FOFB) which dynamically counteracts noise and vibrations by adjusting the beam positions 10 times a second.

The FOFB is in charge of the following:

• Gathering the beam positions and drifts around the machine provided by the BPMs.

• Transmitting all the position measurements to the computational unit/s.

• Calculating the correction values and actuation on the beam through corrector magnets.

The BPM and FOFB Control System is an instrumentation system used for diagnostic and beam stabilization. It includes hardware equipment (Libera Brillance), firmware and software (TANGO devices and GUI library).

Both are part of the accelerators Diagnostics, in charge of measuring the beam position, intensity and distribution.

More generally, Diagnostics comprise:

• Fluorescent Screen and Optical Transition Radiation monitor (FSOTR)
• CCD Cameras & Detectors
  
• Beam Positioning Monitors (BPMs, for instance Libera Brilliance electronics) 
• Beam Charge Monitors (BCM)  
• Oscilloscopes, distributed throughout the ring for feedback to the Fast Orbit Feedback System (FOFB)