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GPU TPC CF: Add hipTailFilterMinimum option #15513

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Merged
davidrohr merged 1 commit into from
Jun 11, 2026
+5 −0
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GPU TPC CF: Add hipTailFilterMinimum option #15513

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1 change: 1 addition & 0 deletions GPU/GPUTracking/Definitions/GPUSettingsList.h
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Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,7 @@ AddOptionRTC(maxTimeBinAboveThresholdIn1000Bin, uint16_t, 500, "", 0, "Except pa
AddOptionRTC(maxConsecTimeBinAboveThreshold, uint16_t, 200, "", 0, "Except pad from cluster finding if number of consecutive charges in a fragment is above this baseline (disable = 0)")
AddOptionRTC(noisyPadSaturationThreshold, uint16_t, 700, "", 0, "Threshold where a timebin is considered saturated, disabling the noisy pad check for that pad")
AddOptionRTC(hipTailFilter, uint8_t, 0, "", 0, "Enable Highly Ionising Particle tail filter in CheckPadBaseline (0 = disable, 1 = filter tails)")
AddOptionRTC(hipTailFilterMinimum, uint16_t, 1024, "", 0, "Thread signal above this minimum as saturated")
AddOptionRTC(hipTailFilterThreshold, uint16_t, 100, "", 0, "Threshold that must be exceeded for a timebin to be counted towards Highly Ionising Particle tail")
AddOptionRTC(hipTailFilterAlpha, float, 0.5f, "", 0, "Smoothing factor for the exponential Highly Ionising Particle tail filter")
AddOptionRTC(occupancyMapTimeBins, uint16_t, 16, "", 0, "Number of timebins per histogram bin of occupancy map (0 = disable occupancy map)")
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4 changes: 4 additions & 0 deletions GPU/GPUTracking/TPCClusterFinder/GPUTPCCFDecodeZS.cxx
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Expand Up @@ -477,6 +477,10 @@ GPUd() void GPUTPCCFDecodeZSLinkBase::WriteCharge(processorType& clusterer, floa
CfChargePos pos(padAndRow.getRow(), padAndRow.getPad(), localTime);
positions[positionOffset] = pos;

if (charge >= clusterer.Param().rec.tpc.hipTailFilterMinimum) {
charge = 1023.f;
}

// Only apply gain correction if ADC not fully saturated
// and ensure gain correction doesn't accidentally saturate the ADC
if (charge < 1023.f) [[likely]] {
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