Here you can find a short description of how to start and operate a program which controls the high voltage for the 3GEM setup on our MediTPC.
- The program shall be run at
flctpcdaq02.desy.de. Connect viatelnet(username:tpc, password: ask somebody who has worked with the DAQ before). - Change to the subdirectory
~/3gem_steer, then start the executable3gem_steer.exe. Caution: Only one instance of the program shall be run! Safety first: The program will not ramp up any voltages at startup, but still be aware that the high voltages might be already applied to the GEMs! - “Default” voltages and electric fields are read out from the file
3gem_steer.conf.
The user interface is meant to be self-explanatory.
Upper left corner: Goal GEM voltages, trip current and transfer/induction fields.
Lower left corner: Goal HV power supply voltages, which are calculated from Goal GEM voltages and\ fields. The status of the HV power supply channels is displayed.
Lower right corner: Monitored (current) voltages of the HV power supply.
Upper right corner: Monitored (current) GEM voltages and fields, which are calculated from monitored voltages of the HV power supply.
Navigation is done with the cursor keys: up/down for selecting GEM/field and right/left for trimming the values. Hit “Enter” in order to enter new value.
Once a GEM voltage/field has been changed, the corresponding HV power supply channels will show new values but (!) will not update these channels! One should hit “Commit changes…” or hit the “C” key.
In order to switch the HV on/off, hit “Switch HV ON” or “Switch HV OFF”, respectively.
Quit the program with “Quit” or hit the “Q” key.
In the case of a trip, the program will reestablish the voltages in five minutes. If more than four trips occur within one hour, the program will not ramp up voltages any more – one has to restart the program!
The source code is available in the subdirectory ~/3gem_steer/src, feel free to work on a copy of this code. You can also download the source code here:
3gem_steer.tgz
