A new EtherCAT based control/automation scheme for the BElChem DCM beamline

Abstract To align BESSY II with the broader BESSY II+ facility upgrade plan, a new generation of control systems hardware and software is necessary [1]. The existing end-of-life hardware will be gradually replaced with modern state-of-the-art tools. In the initial phase, the new Berlin Joint Lab for Electrochemical Interfaces (BElChem) hard x-ray beamline at BESSY II will undergo equipment upgrade, starting with the installation of new motion control hardware. The beamline includes a double crystal monochromator (DCM), and two adjacent mirror chambers, which comprise 20 motor axes, a selection of different feedback and temperature sensors and a piezo driver. The selection of the new hardware is based on the integration of all necessary components into a unified physical control system, while ensuring the required precision and velocity for beamline operation. Previous prototypes involving the EtherCAT interface have delivered positive results, prompting its adoption in this project. Various EtherCAT devices are considered during the evaluation process. The design of the EtherCAT-based control system will be presented and discussed.