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DMT Monitors: Beyond the FOM

This document provides an in-depth overview of the DMT monitors utilized in the LIGO project, extending beyond commonly known Figures of Merit (FOMs). It covers how to recognize running monitors, the types of data produced, and their locations, as well as practical applications of DMT for analyzing new phenomena. Key elements include trend monitoring, status reports, alarms, and trigger statistics. The content serves as a comprehensive guide for LIGO personnel to effectively use data from the DMT system for both online and offline operations.

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DMT Monitors: Beyond the FOM

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  1. John Zweizig LIGO/Caltech LLO August 18, 2006 DMT Monitors: Beyond the FOM

  2. Everyone Knows About the FOMs

  3. Other Things Aren't So Obvious • How do I know what's running? • What kinds of data are the monitors producing? • Where are the output data located? • How do I use them? • Can I use DMT to look at new things?

  4. Overview • DMT Online • data products • Spi Page • Getting the data • Running existing monitors. • Setting up the environment • Making a PSLmon configuration • Running offline (or online at LHO?)

  5. DMT Data Products • Online DMT viewer objects • dmtviewer (FOMs) • webview • Trends • Everything you see on the FOMs and a lot more are recorded as trends • 1/minute statistical summary (mean, max, min, n, rms)

  6. DMT Data Products • Status reports • Monitor specific status and configuration info (not standardized) • May contain plots, statistics, channel names, etc. • Triggers • Time stamps of interesting events (transients, state changes, readout errors, range overflows, etc) • Lots of metadata to describe transient tim, frequency, etc. • Alarms • flag abnormal run states, failures

  7. Alarms Triggerstatistics Recent triggers Monitor docs Status report Spi Page

  8. Viewing Online Data Objects • webview • Standard browser accessible plots • http://stone.ligo-wa.caltech.edu:9991/monitors.html • dmtviewer • Must install dmtviewer from e.g. ligotools • DMTWEBSERVER=stone.ligo-wa.caltech.edu:9991/LHO,delaronde.ligola.caltech.edu:9991/LLO

  9. webview: Select Monitor

  10. webview: Select plot

  11. webview: et voila

  12. Trend Storage/Retrieval • DMT Trend archive directory structure • Online directories: /dmt/<monitor>/H-M-<gps> • Archive: /archive/frames/dmt/LLO/<monitor>/H-M-<gps> • Trend writer class writes to $DMTRENDOUT/. • Read/process/plot trends like any frame (matlab, root/DMT, etc) or dump with trendtable. • Plot trends from control room with dv.

  13. dv: Channel Selection

  14. dv: Make Plot

  15. dv: Plots

  16. Triggers • Trigger Indicate properties of transient events • Name, subtype • Time: Start, maximum, duration • Frequency: Center, bandwidth, peak • Trigger archival • Triggers generated by monitors, are sent to TrigMgr (and then SeqInsert) to be stored in database

  17. Retrieve Triggers with Guild

  18. Guild Results

  19. Running a Monitor Trigger output Monitor report Trend output directory

  20. PSLmon • Originally written to look at PSL properties (the only subsystem working at the time) • Doc: http://www.ligo.caltech.edu/~jzweizig/dmt/Monitors/PSLmon • Now – A general purpose set of tools • Band limited RMS (fourier domain) • Glitch finding • Spectra • Coherence (not used/tested/supported)

  21. Configuration File • Shell command like syntax. • Configuration commands • Parameter: Set a run-time parameter • Channel: define a channel to be processed • Filter: Define filters • Band: Create a band-limired RMS tool • Glitch: Create a glitch tool

  22. Design a Filter • Use foton or root to specify a filter and • Look at the Bode plot • Check out the time domain response in root

  23. Filter design in Root

  24. Filter Bode Plot

  25. Time Domain Response

  26. Create a PSLmon Configuration

  27. Running on Bermuda Configuration Script Monitor report files Trend files

  28. Dump Trend Channel Names

  29. Look at Trends

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