Author: Brands, H.
Paper Title Page
SwissFEL Beam Synchronous Data Acquisition - A Sneak Peek Under the Hood  
  • S.G. Ebner, F. Märki
    PSI, Villigen, Villigen, Switzerland
  • H. Brands, B. Kalantari, L. Sala
    PSI, Villigen PSI, Switzerland
  A new Data Acquisition system is being developed for the upcoming FEL at PSI. This system is based on several novel concepts and technologies, and it targets at immediate data availability and online processing. The system is capable of assembling an overall data view of the whole machine thanks to the distributed and scalable buffering back-end. Load on data sources is reduced by immediately streaming data as soon as it becomes available. The streaming technology used provides load balancing and fail-over by design. Data channels from various sources can be efficiently aggregated and combined into new data streams for immediate online monitoring, data analysis and processing. The system is dynamically configurable, various acquisition frequencies can be enabled and data can be kept for a defined time window. All data will be available and accessible enabling advanced pattern detection and correlation during acquisition time. Accessing the data in a code-agnostic way will also be possible through the same REST API that is used by the web-frontend. Furthermore, data can be automatically reduced, compressed and extracted for later studies and documentation.  
poster icon Poster MOPGF059 [0.145 MB]  
Data Streaming - Efficient Handling of Large and Small (Detector) Data at the Paul Scherrer Institute  
  • S.G. Ebner
    PSI, Villigen, Villigen, Switzerland
  • H.R. Billich, H. Brands, E.H. Panepucci, L. Sala
    PSI, Villigen PSI, Switzerland
  For the latest generation of detectors transmission, persistence and reading of data becomes a bottleneck. Following the traditional pattern acquisition-persistence-analysis leads to a massive delay before information on the data is available. This prevents the efficient use of beamtime for users. Also, sometimes, single nodes cannot keep up in receiving and persisting data. PSI is breaking up with the traditional data acquisition paradigm for its detectors and is focusing on data streaming, to address these issues. Data is immediately streamed out directly after acquisition. The resulting stream is either retrieved by a node next to the storage to persist the data, or split up to enable parallel persistence, as well as online processing and monitoring. The concepts, designs, and software involved in the current implementation for the Pilatus, Eiger , PCO Edge and Gigafrost detectors at SLS, as well as what we are going to use for the Jungfrau detector and the whole beam synchronous data acquisition system at SwissFEL, will be shown. It will be shown how load-balancing, scalability, extensibility and immediate feedback are achieved, while reducing overall software complexity.  
slides icon Slides WED3O06 [2.264 MB]