Event Filtering

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Events can be filtered by the MIDAS logger (mlogger) into different saved files based on the Event ID or the Trigger Mask (see MIDAS Event Structure). They are specified in the Frontend Equipment List of an event.


To filter events in this way, it is necessary to set up the required number of logging Channels. By default, only one logging channel is created.

Event selection for each of the logging channels can be done by specifying the Event ID key and/or the Trigger mask key

Use the Filename key to specify the path and/or filename for each logging channel.

[deap@ladd07 src]$ odbedit
[local:deap:R]/>cd logger
[local:deap:R]/Logger>ls
Data dir                        /data7/deap/scratch
Message file                    midas.log
Write data                      n
Auto restart                    n
ODB Dump                        y
ODB Dump File                   run%05d.odb
Auto restart delay              0
Tape message                    y
Channels                        
SQL                             
Run duration                    0
Next subrun                     n
Subrun duration                 0
History                         
[local:deap:R]/Logger>cd Channels/
[local:deap:R]Channels>ls
0     
[local:deap:R]Channels>copy 0 1 <<< Duplication of channel 0 to channel 1
[local:deap:R]Channels>cd 1/settings [local:deap:R]Settings>ls Active y Type Disk Filename run%05d.mid.gz Format MIDAS Compression 1 ODB dump y Log messages 0 Buffer SYSTEM Event ID -1 Trigger mask -1 Event limit 0 Byte limit 0 Subrun Byte limit 0 Tape capacity 0 Subdir format Current filename run00102.mid.gz
[local:deap:R]Settings>set "Event ID" 2 <<< Change the logging condition [local:deap:R]Settings>set Filename runid2%05d.mid.gz <<< Change the destination logging file name
[local:deap:R]Settings>ls Active y Type Disk Filename runid2%05d.mid.gz Format MIDAS Compression 1 ODB dump y Log messages 0 Buffer SYSTEM Event ID 2 Trigger mask -1 Event limit 0 Byte limit 0 Subrun Byte limit 0 Tape capacity 0 Subdir format Current filename run00102.mid.gz

Finally, restart the logger.