Benchmark Tutorial
Other Blessing Tutorials: Overview | Blessing
Go to: "Cosmic Ray e-Lab→Upload →Benchmark"

Benchmark Menu

This is where a detector owner will select a best standard data file for comparison to other files in order to bless the other.
The file owner needs to review the blessing plots and use judgement to select one standard file.
So, first pull down the DAQ list to see your DAQ#s,
Detector Pull down

and select your appropriate DAQ#.
Now, set the date range to include one CRMD configuration (coincidence and geometry).
Click "Select Benchmark". This will present a list of candidates for selection.

Select Benchmark


Review the list of candidates by clicking on the file number (such as "6119.2013.1012.0") and looking at the Singles Rates and Trigger Rate.
Use your judgment to decide if this file is representative of all the data for your particular CRMD configuration. A high quality file will have steady Singles & Trigger Rates, plus Singles will fall between 12 to 35 Hz for the standard QuarkNet counters. Here is an example of good blessing plot:

Good Example


and this shows a bad blessing plot:
Bad Example


Notice how one of the channels wanders around indicating irregular rates.

After you have selected a representative file, type a helpful name that you will recognize later and click "Save".
Now, when you go back to "Upload" → "Upload" the chosen benchmark will appear on the pull-down list next to the DAQ#.

For the DAQ# for which you are uploading data, select a benchmark file from the pull-down list. This benchmark file will now be compared to the uploaded data to measure its quality.

Later, if the detector configuration changes (coincidence, geometry) then a new benchmark file needs to be selected.

When selecting files for analysis, review the blessing plots by clicking on the "star". See if you agree with the owner assessment for quality data.