The noise scan consists of one scan step only (AliITSOnlineSPDscanSingle class, see SPDscan Package documentation). Detector configuration is the same throughout the scan, applied in such a way that the pixels are expected to be silent.
The processing is done in the "AliITSOnlineSPDscanAnalyzer::ProcessNoisyPixels" method. The efficiency of hits in each pixel is compared to a reference value (fNoiseThreshold, which could be set at for example 0.01). A minimum number of events is also required (fNoiseMinimumEvents).
|fNoiseThreshold||Threshold for the fraction of events a pixel may be hit before it is declared noisy|
|fNoiseMinimumEvents||Minimum number of events required in the search for noisy pixels|