Tagging Spectrometer Expert

Tagger Microscope

Expert Communication with the Microscope

Interacting with the microscope is accomplished through the command line using software in the /home/hdops/TAGMutilities directory. Note, this is for experts only. Do not issue commands unless you are confident you know what you are doing.

For communication to be possible, the daemon TAGMremotectrl must be running on gluon28.

1. Someone with root privileges needs to start TAGMremotectrl. Ideally this will be performed automatically after each reboot.
2. If it needs to be started, make sure that the network device em2 is up.
3. If em2 is not up, issue the command `/sbin/ifconfig em2 up`

Once the power voltages have been turned on and TAGMremotectrl is running, check that the control boards are responding:

1. /home/hdops/TAGMutilities/bin/probeVbias -l gluon28.jlab.org:5692
2. This can be performed from any gluon node, not just 28.
3. The response should show the MAC address for each of the control boards 8e - 9e.
4. If a board does not appear, turn off/on the power voltages and try again. This reset usually resolves the issue.

The current SiPM voltages as well as other important voltages and temperatures can be seen with the readVbias command:

1. /home/hdops/TAGMutilities/bin/readVbias 8e@gluon28.jlab.org:5692
2. 8e can be anything from 8e to 9e in hex format.
3. Low gain is about 5 V, high gain is about 10 V
4. The sumref voltages are 4.00-4.15 V depending on the board
5. DAC health should be 13 after initially biasing the SiPMs
6. Typically SiPM biases are 72 V when active, 70-71 when effectively turned off

Biasing the SiPMs can be performed with the following command:

1. /home/hdops/TAGMutilities/bin/setVbias -L -C setVbias_fulldetector-2-23-2017.conf -r 1-5 -c 1-102 -g 0.45 -p 15 gluon28.jlab.org:5692
2. Only change the SiPM voltages if you know what you're doing!
3. Running the setVbias command without arguments will provide the usage and meaning of each option.
4. Standard running uses low gain, g = 0.45, p = 15