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Comprehensive Overview of the CSS Scan System for Experimental Automation

The CSS Scan System developed by Kay-Uwe Kasemir offers a modular and robust solution for automating experimental setups in scientific research. This system integrates supervisory control, data acquisition (DAQ), and flexible command execution, allowing for various scan types such as X/Y scanning and temperature ranges. Key functionalities include live-cycle management, real-time progress monitoring, and condition-based delays. The system supports multiple channels and interfaces, connecting seamlessly with existing beamline equipment. By streamlining experimental automation, it enhances data analysis and improves research efficiency.

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Comprehensive Overview of the CSS Scan System for Experimental Automation

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  1. The CSS Scan System Kay-Uwe Kasemir SNS/ORNL Dec. 2013

  2. Large Experimental Setups To Control http://imgs.xkcd.com/comics/telescope_names.png

  3. Overall Picture for SNS Detector Aggregator Nexus Nexus Instrument Events Translation Service Data Stream Nexus Sample Environment Sample Environment Equipments Sample Environment Equipments Scan Server Mantid Histogram Service GUI: CSS GUI: CSS GUI: CSS EPICSIOCs Channel Access

  4. Experiment Components Equipment Motors, Temperature Regulators, Detectors, .. Supervisory Control Manually control and monitor Automation Schedule ‘scan’ of crystal positions, temperatures, … Data Acquisition Log data of interest during an experiment ‘run’ Data Analysis Turn logged data into scientific information

  5. Experiment Components… • Equipment • Supervisory Control • Automation • Data Acquisition • Data Analysis CSS Scan System: Modular, robust building block for experiment automation. Interfaces to supervisory control, DAQ, …, but as a separate component.

  6. Ideally both Flexible and Robust Flexible Control any beam line equipment Standard tasks: X/Y scan of surface CT-scan sample rotation Temperature range scan Ad-hoc tasks: While ramping Temperature, scan X/Y for each T Scan table of T, X, Y Robust • Control Scan’s Live-cycle • Start/pause/resume/stop • Monitor progress • Simulate scan • Queue multiple scans • Built-in checks • Are devices available? • Did device acknowledge? • Does read-back match? • Did access time out?

  7. Scan Server Accepts ‘Scans’, executing them in order of submission http, REST (also: EPICS V4 server; ‘telnet’ console) Scan Server Channel Access (also: EPICS V4, simulated channels) EPICS IOCs Equipment

  8. Scan Commands • Set device = value Optional: wait for completion, verify read-back, with timeout. • Wait for device == value Optional: Wait until a device is ==, >, …, incremented-by a certain value, with timeout. • Loop device = 1 .. 10, stepping 2 Optional: completion, read-back and timeout. • Log device1, device2 Log data to monitor/analyze scan. No replacement for DAQ! • Delay for … seconds Discouraged. Better: Wait for device to meet condition. • Script • Execute Jython code. Use with care. Custom commands can be added via Eclipse extension points.

  9. Accessing the Scan Server Web Browser Java CSS Scan Editor, Scan Monitor Jython (CSS *.opi) Matlab Any custom code .. with ‘http’ library

  10. CSS User Interfaces for Scans Scan Server

  11. Beam Line Example: CT ORNL HFIR CG-1D

  12. “Table” Scan

  13. “Range” Scan with Edge Detection

  14. ScanEditor • “Undo” • Drag/dropcommands or PV names (also as XML text) • Device PVs (or alias) can be picked from beamline-specific configuration Add commands Open, save Set parameters

  15. Matlab Create Scan Monitor Analyze (maybe submit follow-up scan)

  16. Performance (before PVManager) • Command Execution • 80000 commands/second: Delay 0 sec, Set w/o read-back • 4500 commands/second: Set w/ read-back, Loop • Download scan into Editor • 10000 commands: 1 second • 50000 commands: 15 seconds

  17. Ongoing Work Separation of Scan Execution and GUI Good for stability Added work “Start”: GUI Script to submit scan  Scan Server “Plot”: Scan writes to PVs  BOY displays PVs Simpler interfacing via PVManager and V4 Data Types “Start”: Invoke pvmanager ‘service’ for 1D-scan “Plot”: Read scan log as V4 Table ‘pva:scanData?id=47’

  18. Submit Scan via PVManager “Service”

  19. PVAccess & PVManager for Status & Log

  20. Summary: CSS Scan System Modular, robust building block for experiment automation.

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