Introduction:

In this paper, we present a new generation of Beam Profile Monitors (BPMs) on the X-Ray beamline to monitor in real-time the position of the beam at specific locations.

Hardware devices and placement:

Those BPM are made of 4 antennas that are connected to an IBA specific electronic measurement device. The design of the antennas and electronics has been optimized to increase sensitivity while reducing the radiofrequency noise. Locations of the antennas were studied to ensure resolution for the X-ray field monitoring as well as equipment protection. 

Increase measurement sensitivity and dynamics:

One of the main challenges of those BPMs was the large range of measured beam current going through the beamline, for tuning or for full power operations. With the development of the specific electronic board, we reached a minimum measured beam current of 10 µA and a maximum of 80 mA, along with a beam position measurement accuracy of less than 0,8 mm.

Beam position on X-ray target :

Ensuring a good position of the electron beam on the X-ray target is a mandatory step to guarantee X-Ray OQ and enable parametric release. A set of 2 BPMs is used on the beamline to measure the deviation and the position of the beam on the X-ray target. Optimizing the position of those BPMs on the beamline combined with the high accuracy of the beam position measurement allow to ensure a beam position error on the X-ray target better than 5 mm.

Conclusion :

The BPM is giving a safe routine operation by automatically controlling the beam position. This allows in routine full power with low risk in 7/24 operation.

This paper demonstrates that, after optimization, they can be used for accurate and automatic X-Ray operations and will enable parametric release in the near future.