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Calibrations

Events per BC Calibration

Description

Generates histograms of Events per Bunch Crossing (BC). Events can be filtered by applying amplitude thresholds to the A-side and C-side.

Command-Line Options

Option Default Description
--slot-len-sec 3600 Duration of each slot in seconds.
--slot-len-tf 0 Slot length in Time Frames (TFs).
--one-object-per-run — If set, the workflow creates only one calibration object per run.
--min-entries-number 0 Minimum number of entries required for a slot to be valid.
--min-ampl-side-a -2147483648 Amplitude threshold for Side A events.
--min-ampl-side-c -2147483648 Amplitude threshold for Side C events.

How to Run

Simulation Data

First, it is important to digitize data with a non-zero run number, orbit, and timestamp. To set these parameters, one can use the --configKeyValues option, as shown in the example below.

o2-sim-digitizer-workflow \
--onlyDet FT0 \
--configKeyValues="HBFUtils.nHBFPerTF=128;HBFUtils.orbitFirst=128;HBFUtils.orbitFirstSampled=256;HBFUtils.runNumber=560560;HBFUtils.startTime=1768464099000"

To process simulation data, digits must first be converted to RAW format. The o2-ft0-digi2raw tool performs this conversion and generates the required configuration file.

Once converted, you can run the calibration either as a single integrated workflow or by spawning as the sender and receiver components separately.

Single Workflow Example

Execute the following command within the simulation directory:

o2-raw-file-reader-workflow --input-conf FT0raw.cfg --loop -1 \
| o2-ft0-flp-dpl-workflow --condition-backend=http://localhost:8080 \
| o2-calibration-ft0-events-per-bc-processor --FT0EventsPerBcProcessor "--slot-len-sec=10" \
| o2-calibration-ccdb-populator-workflow --ccdb-path=http://localhost:8080

Sender example (in simulation directory):

o2-raw-file-reader-workflow --input-conf FT0raw.cfg --loop -1 \
| o2-ft0-flp-dpl-workflow --condition-backend=http://localhost:8080 \
| o2-dpl-output-proxy --channel-config "name=downstream,method=connect,address=tcp://localhost:30453,type=push,transport=zeromq" --dataspec "downstream:FT0/DIGITSBC"

Receiver example:

o2-dpl-raw-proxy --channel-config "name=readout-proxy,type=pull,method=bind,address=tcp://localhost:30453,rateLogging=1,transport=zeromq" --dataspec "A:FT0/DIGITSBC/0" \
| o2-calibration-ft0-events-per-bc-processor --FT0EventsPerBcProcessor "--slot-len-sec=10 --min-ampl-side-a=0" \
| o2-calibration-ccdb-populator-workflow --ccdb-path=http://localhost:8080/

CTF Data

Example:

o2-ctf-reader-workflow --ctf-input ctf.root --onlyDet FT0 \
| o2-calibration-ft0-events-per-bc-processor --FT0EventsPerBcProcessor "--slot-len-sec=10" \
| o2-calibration-ccdb-populator-workflow --ccdb-path=http://localhost:8080/