ORBIT DATA PROCESSING USING THE DATA ACQUISITION SYSTEM (DAQ) AT THE TTF VUV-FEL

At the Vacuum Ultraviolet Free Electron Laser TTF VUV-FEL located at DESY 66 Beam Position Monitors (BPMs) registrate the deflection of the electron beam. To make the huge amount of these orbit data manageable for the operator a server program processing the orbit data (Orbit Server) is implemented. As a part of the TTF VUVFEL DAQ it reads the data from a central data pool, the Shared Memory (SHM). Besides this, it computes on request other parameters of the beam, for example temporal trends or the beam position scattering at the BPM locations. The application of the SHM concept is an example, which proofs the benefits of using the SHM technology for accelerator controls. A corresponding Orbit-Display acts as the operator’s graphical interface. It mainly shows the orbit data, provides zoom functions in all three spatial dimensions and enables the operator to adjust the pre-processing done by the Orbit Server.