The 'miniscanner' in position in front of the ejection 58 septum magnet

The 'miniscanner' in position in front of the ejection 58 septum magnet. The mechanism provides for the movement of a probe, in the shape of a flag, across the proton beam to allow the spatial density of the beam to be accurately measured. The squared screen rapidly provides more general information about the rad.al position of the beam.