Article on Halo Studies Published in JINST
A thorough understanding of halo formation and its possible control is highly desirable for essentially all particle accelerators. Particles outside the beam core are not only lost for further experiments, they are also likely to hit the beam pipe, and activate this, as well as accelerator and experimental components in close proximity, which makes work on the accelerator costly and time consuming. Well established techniques for transverse beam profile measurements of electron or high energy hadron beams are the observation of synchrotron radiation, optical transition radiation or the like. A particular challenge, however, is the detection of particles in the tail regions of the beam distribution in close proximity of the very intense beam core.
Results from laboratory measurements on two different devices are presented in the article "Flexible Core Masking Technique for Beam Halo Measurements with High Dynamic Range" that was now published in the Journal of Instrumentation.