|MOMAU003||The Computing Model of the Experiments at PETRA III||44|
The PETRA storage ring at DESY in Hamburg has been refurbished to become a highly brilliant synchrotron radiation source (now named PETRA III). Commissioning of the beamlines started in 2009, user operation in 2010. In comparison with our DORIS beamlimes, the PETRA III experiments have larger complexity, higher data rates and require an integrated system for data storage and archiving, data processing and data distribution. Tango  and Sardana  are the main components of our online control system. Both systems are developed by international collaborations. Tango serves as the backbone to operate all beamline components, certain storage ring devices and equipment from our users. Sardana is an abstraction layer on top of Tango. It standardizes the hardware access, organizes experimental procedures, has a command line interface and provides us with widgets for graphical user interfaces. Other clients like Spectra, which was written for DORIS, interact with Tango or Sardana. Modern 2D detectors create large data volumes. At PETRA III all data are transferred to an online file server which is hosted by the DESY computer center. Near real time analysis and reconstruction steps are executed on a CPU farm. A portal for remote data access is in preparation. Data archiving is done by the dCache . An offline file server has been installed for further analysis and inhouse data storage.
|Slides MOMAU003 [0.347 MB]|
|Poster MOMAU003 [0.563 MB]|