Abstract
The Karabo distributed control system has been developed to address the challenging requirements of the European X-ray Free Electron Laser facility, including complex and custom-made hardware, high data rates and volumes, and close integration of data analysis for distributed processing and rapid feedback. Karabo is a pluggable, distributed application management system forming a supervisory control and data acquisition environment as part of a distributed control system. Karabo provides integrated control of hardware, monitoring, data acquisition and data analysis on distributed hardware, allowing rapid control feedback based on complex algorithms. Services exist for access control, data logging, configuration management and situational awareness through alarm indicators. The flexible framework enables quick response to the changing requirements in control and analysis, and provides an efficient environment for development, and a single interface to make all changes immediately available to operators and experimentalists.
Highlights
Femtosecond X-ray Experiment (FXE) DET LPD1MÀ1=FPGA=FEM Q1M2 refers to the 1 Mpixel Large Pixel Detector (LPD, see Section 5.3), installed in the FXE hutch, and there to a sub-component which is an FPGA board acting as the control interface to the second module of the first detector quadrant
While Karabo is implemented with an open communication between the devices, basic security aspects are addressed during the installation at EuXFEL by separating the control network hosting the Karabo servers from the generic office network of the company
The control and analysis software group at the European XFEL follows modern software engineering procedures: the group of 20+ software engineers is supported by an agile manager, coordinates work in daily stand-up meetings and uses a public backlog of activities
Summary
The European XFEL is a research facility with diverse and somewhat unusual requirements including a pulse structure (up to 27000 photon pulses per second) arranged into 10 Hz trains of pulses at 4.5 MHz (Altarelli et al, 2006; Altarelli, 2011) and the use of state-of-the-art, high-repetition-rate, large-area 2D imaging detectors capable of detecting images of scattered photons produced by a single XFEL photon pulse. This decision was supported by the DAQ-and-Controls section of the Detector Advisory Committee (DAC) which is the responsible international advisory body for the European XFEL. The intention is to release Karabo to the public using an open source software licence in the future
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