In order to improve coverage of beam loss measurements, we have been investigating the use of a fibre based time of flight measurement.
A prototype system has been installed, with fibres installed across cells one and two, starting just downstream of the injection kicker magnets. The fibres are positioned in the beam plane horizontally, one fibre in board and one out board. Sensors are installed at the upstream and downstream ends.
Initial measurements show that the system can detect injection losses and losses due to RF trips.