T0 Scan

This page presents the tests that were performed on the T0 Scan. In the Göttingen lab an USBpix system was used as a ROD and an alternating plot behavior was seen. See also here for a summary presentation at the DAQ meeting. The code can be found in the following branch: /user/jmellent/PixelDAQ-02-05-00_T0

Changes in PixModuleGroup::endT0Set(...)

  • Distinction between PixScan::TIMEWALK and PixScan::SCURVE_MEAN was removed. Now always PixScan::SCURVE_MEAN is chosen
  • For test purposes conv[ife] is set to 1
  • For dummy values of double a = (*hTime)(col, row); and double b = (*hTime1)(col, row); the alternating plot behavior occurs still
  • ((ConfFloat &)((*fe)->config()["Misc"]["DelayCalib"])).m_value is always 1 for conv[ife] = 1 and for a non fixed calibration it increases with every scan
Changes in PixModuleGroup::writeConfig(...)
  • Added check to see if PlsrldacRamp is set correctly
Checks in USBPixController::writeScanConfig(...)
  • scn.getStrobeLVL1DelayOverride() is always 1
  • reduce_lvl1delay is always 0
  • scn.getStrobeLVL1Delay() has the same values as reg_data[3] and a range from 56 to 58
  • These values are also identical for multiple scans
  • Changed reg_data[3] = (scn.getStrobeLVL1Delay() - reduce_lvl1delay); to reg_data[3] = (unsigned char) (scn.getStrobeLVL1Delay() - reduce_lvl1delay);

Suspects for the alternating plot behavior

  • Inside USBPixController
  • Or USBpix code called from there (top suspect)
  • Inside post-loop histogram processing (would also affect IBL RODs)

-- JohannesDonatusMellenthin - 2017-01-17

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Topic revision: r2 - 2017-01-17 - unknown
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