Speaker
Description
The European Synchrotron Radiation Facility (ESRF) operates a well-established program of comprehensive Storage Ring (SR) and regular machine surveys to maintain the geometric integrity of the accelerator and serve as the primary reference for all beamlines. Over the past three decades, the SR survey has evolved into a highly coordinated activity comprising nearly 10,000 measurements completed within a single eight-hour shift, achieving measurement uncertainties of approximately 50 μm in the radial direction (dR) and 20 μm vertically (dZ). However, until now, beamline survey campaigns have been conducted on a more ad-hoc basis, typically comprising partial or local measurements carried out only when necessitated by specific alignment interventions. Moreover, alignment requirements on the beamlines have evolved considerably and have become increasingly stringent, demanding a more systematic and rigorous monitoring approach.
To address this, ESRF has introduced a new monitoring method that extends the comprehensive SR and regular machine surveys to the beamlines through a dedicated annual survey campaign. This approach replaces the former ad-hoc practice with a systematic, full-beamline monitoring strategy tied directly to the Storage Ring reference network. These measurements provide valuable information on the long-term geometric behavior of the beamlines, enabling identification of global displacement patterns and direct comparison with the evolution of the Storage Ring reference network.
As the campaign has only recently been established, the available dataset is not yet sufficient to identify long-term trends or draw definitive conclusions. This paper presents the methodology and implementation of the annual beamline monitoring campaign, laying the foundations for future studies of the geometric evolution of ESRF beamlines and establishing the framework for ongoing stability assessment.
