The Lumberjack Datalog Plotter (D44)
The accelerator system has a very powerful data logging system called "Lumberjack" (it is called "lumberjack" because it is a "logger").
Within this system, individual logging processes record specific device
readings, either at discrete intervals,or sampled on particular events.
Analyzing the logged data can be extremely useful in understanding performance
and debugging problems. The interface used for reading back logged
data is D44. You can use this plot to retrieve and plot up to eight
devices either as a function of time or as a function of another logged
device value. The interface is shown below
The interface is not entirely intuitive, but it's worth learning, if you
want to really understand things. Specific setups can be saved and
recalled for common tasks.
For example, to get a summary of MiniBooNE beam performance:
- Click in the field next to "Data Source" and select "MBoon (DUE04)".
This selects a particular list of saved setups.
- Click on "Recall".
This will pull up a list of saved setups.
- Click on "summary".
This will recall a setup similar to the one shown above.
The saved setup restores everything except the plotting display
- To plot these variables over, say, the last 4 hours
- Click "T2 Now"
- Click "Interval"
- Click "hour"
- Enter "4" in the field and hit return.
- (An alternative is to type over the existing fields after "T1=".)
- Now click on any of the variable names to make the plot.
The resulting plot will look something like this
The datalog plotter also has a web-based interface, which might be a
little more intuitive for those not familiar with the controls system.
It can be found at