-- MagdalenaMuenker - 2017-05-11

Test-Beam Measurements

General Information

The working directory is '/home/telescope/investigator-software'.

The measurement is composed of three different steps:

  1. Pedestal measurement
  2. Analysis of pedestal measurement
  3. Data taking
The different steps are described in the following.

Pedestal Measurement

Before starting the Investigator data taking, a pedestal measurement needs to be performed. During data taking, the Investigator software can then use the pedestal measurement to extract the noise level and set a trigger theshold on the value of signal/noise.

To record the pedestal measurement the RunControl needs to be started first in a seperate terminal from the directory ' ' with the command './RCGui', since the Investivestigator software waits for a start-command, which can be send from RunControl:

  • Start the pedestal measurement in the investigator-software directory with the command 'sudo ./pedestalMeasurements.sh $chip_number$ $mini_matrix$' and wait till Investigator is ready.
  • Go to the tab 'set paraments (without starting measurements)' in the RunControl Gui and dend the start-command to the Investigator software by clicking on 'Investigator start'.
  • Wait untill the Investigator software has at least recorded 500 events (visible in print out of ./pedestalMeasurements.sh script) before clicking on 'Investigator stop' in the RunControl Gui.
  • After the Investigator software has written the events (visible in print out of ./pedestalMeasurements.sh script: 'finished writing'), the Investigator software is stopped by stopping the script ./pedestalMeasurements.sh with ctrl-c.
A directory 'data/investigator/lab/ch$chip_number$_mm$mini_matrix$/pedestal/' has been created containing the data of the pedestal measurements.

Important notes

  • The bias voltage is hard coded as 'VBB_LIST' in the script ./pedestalMeasurements.sh
  • If the pedestal measurement was not recorded correctly, the directory 'data/investigator/lab/ch$chip_number$_mm$mini_matrix$/pedestal/' needs to be deleted, since the pedestal measurement is not over written, once a directory has been created for the parametes the pedestal value depends on:
    • Chip number
    • Mini matrix
    • Reset voltage
    • Bias voltage
  • During beam one should check, that the pedestal measurement is taken in the time between the spills.

Analysis of pedestal measurement

In a next step the pedestal measurement needs to be analysed to extract the noise level. For this the script 'sourceMeasurements.sh' needs to be started:

  • Type the command 'sudo ./sourceMeasurement.sh $chip_number$ $mini_matrix$ $trigger threshold [signal/noise]$', while the last parameter $trigger threshold [signal/noise]$ can be set to an arbitray value.
  • If the Investigator is ready, click on 'Investigator start' in the RunControl Gui.
  • Wait untill the print out from the script './sourceMeasurement.sh' says, that the pedestal measurement has been analysed and click on 'Investigator stop' in the RunControl Gui.
  • Stop the script './sourceMeasurement.sh' with ctrl-c.
A file 'name' with the single pixel noise values as the xth parameter has been created in the directory 'x'.

Important notes

  • The bias voltage is hard coded as 'VBB_LIST' in the script ./sourceMeasurements.sh

Data taking

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Topic revision: r2 - 2017-05-11 - MagdalenaMuenker
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