Bias voltage and angle scan - Instructions

If the windows are not already open,

Use remote desktop to connect to the Windows machine in the experimental area:

  • Open the Remmina Remote Desktop Client;
  • Connect to pcsyr02;
  • Go to the Control Peltier GUI;
  • Set the voltage to 18.00 V and then activate it, checking that the current is around 4.2 A.
From the terminal:
  • connect to the machine in the experimental area (ssh -XY tboperator@pcsyr01);
  • open the Alibava GUI by typing "alibava-gui";
  • Load the proper configuration file by clicking on "File"-->"Open", selecting "standard_ut_tb_trig_pulse_buffer_5000_no_pulse_shaping_with_plugin.ini" and typing in the terminal the following values: 0, 100, 30 (each followed by ENTER);
    • Coordinate the data taking with the VELO (and RICH) group: inform them that you intend to start, start to run slightly after them, and stop the run slightly before them.
    • Let one spill go by before starting UT data taking.
Take data!
  • 100k events per run.
  • Add the run in the run logbook at
  • Be sure to check the temperatures and voltages on the Telescope DQM. Our channels are T3 and T4 for Temperature.
  • Bias voltage scan from 25 to 250 V in 25 V steps and from 250 to 500 V in 50 V steps.
  • Quickly analyze the data and find the depletion voltage (it should be around 250 and 300 V).
  • Set the bias voltage to something slightly above the depletion voltage.
  • Angle scan of (0,5,15,25,-5,-15,-25) degrees at 300 V.
    • Quickly analyze the data and check that everything is going smoothly!


  • Talk to the people around you. See if there's a problem
  • Really lost? Call people!
    • GUI/DQM: Adam Davis(+41 76 631 35 29)

-- FedericaLionetto - 22 Oct 2014

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Topic revision: r4 - 2014-10-23 - AdamDavis
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