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GECo Channels

Utilities for organizing and querying LIGO timing-related channels.

A script for storing data about the timing system's current configuration with plenty of command line options (and a simple internal python interface) for filtering the channel list.

Site Maps

Hanford, WA


Livingston, LA


There are two as-installed site maps saved in Omnigraffle format. You will need Omnigraffle (and hence a Mac) to open them. When exported to PDF, each timing device is clickable and will link to a page on LIGO DV Web with a list of relevant channels for that device, from which point you can make plots in your browser using LIGO DV Web, or just use the channel names you have found. The names of devices in the map can also be directly used to reconstruct at least partial channel name information.

Channel names, as used in dataviewer and sitemap, can be constructed by concatenating the italicized names with an underscore between them, starting with the nearest Master/Fanout. For example, the below comparator (the yellow device) would have channel names beginning with: L1:SYS-TIMING_Y_FO_A_PORT_9_SLAVE_CFC

Timing Comparator

While onsite, use the sitemap command from any terminal to view a menu of MEDM control screens. Click SYS > Timing to get a "green screen" real time view of the timing system.

Use dataviewer from any terminal to get timeseries data on any of these channels. Go to the Signal tab, select the Slow checkbox in the bottom left corner, and navigate through L1 > L1:SYS > L1:SYS-TIMING and so on until you’ve found the relevant channel. All possible channels are listed, regardless of whether they are in active use.

Timing devices connect to the ports on the front of a master/fanout module via a fiber connection. There are 16 ports on any given master/fanout. Keep the timing map up-to-date by placing devices beside the master/fanout ports to which they are connected.

Updating the Site Maps

  1. When editing this map in Omnigraffle, make sure to add a URL action in the "Properties" section of the "Inspect" sidebar. For the URL, write the prefix l.dv/ (which will later be expanded to a list of channel name results on LIGO-DV-Web) followed by the partial channel name (should look like l.dv/)
  2. Run the script (full text below), which should also be contained in this repository on this graffle file. For example, if the SVG file is called map.svg, you would run ./ map.svg.
  3. Re-open this file and confirm that any new links have been expanded properly.
  4. Export to your preferred format. SVG, PDF, and HTML all preserve links; other image formats do no.

Full text of

(note that the sed command is a single line)


sed -i.orig 's|l.dv/\([a-zA-Z0-9_-]*\):\([a-zA-Z0-9_-]*\)|https\://\&baseSelector=true\&ifo=any\&subsys=any\&fsCmp=%3E%3D\&fs=any\&chnamefilt=\1%3A\2\&currentOnly=show+only+currently+acquired\&submitAct=Retrieve+Channel+List+%BB|g' "$1"


scripts for getting names, descriptions, and sublists of timing channels




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