Speaker
Description
Stored energies in the FCC-ee colliding ring are expected to be just below 20 MJ for the Z-pole configuration - still one order of magnitude below that of the LHC. However, due to the extremely small vertical beam size, the beam energy density remains high enough to pose a risk of damaging the accelerator. A beam loss system must therefore be capable of detecting losses quickly enough to protect the accelerator components by triggering a beam extraction before any damage occurs.
In addition, the system must provide continuous measurements of the magnitude and location of beam losses throughout the accelerator to optimize the machine operation. While final specifications for the minimum and maximum detectable beam losses are still under study, the proposed beam loss system for the FCC-ee will cover monitoring in both the arcs and at the collimators.
For the arc, the required granularity of the system is being discussed. For the collimators, a fast read-out beam loss monitor is proposed downstream each unit. R&D is necessary to determine the final technology to be used for both the arc and the collimation systems. However, based on the current information, the required infrastructure and number of devices can already be estimated.
