IC59 Cascade FilterComparison between the recos for

(HLC+SLC) and (HLC only) pulsesPart I

Mariola Lesiak-BzdakLBNL

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Cascade Phone Call, Nov. 8, 2010

Hard Local Coincidence

• A DOM will trigger if the PMT signal exceeds 0.25 PE. Readout hit only if a neighboring DOM on the same string is also hit within ±1μs – Hard Local

• LC span 1• LC span 2 Triggered DOM

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What is SLC?• SLC stands for Soft Local Coincidence readout

mechanism. It means that the PMT waveform is digitized and read out whenever the DOM's PMT signal exceeds the threshold, even without coincidence with neighboring DOMs (thus, it is actually no coincidence at all). Thus, each hit without the local coincidence condition met will be SLC hit.

• Most SLC hits recorded in an event are due to dark noise – cleaning of SLC hits needed – see:

http://wiki.icecube.wisc.edu/index.php/SLC_hit_cleaning

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Comparison of the same event seen with only HLC (left) and both HLC and SLC (right)

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HLC + SLC readouts HLC readouts only

No cleaning applied!

Cleaning needed!

Seeded RT-Cleaning principle

• A hit is only kept if it has another hit:

• within a designated radius R

AND

• within a time distance T

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More:http://wiki.icecube.wisc.edu/index.php/SLC_hit_cleaning

SLC hit cleaning implementation in the code at Level2 for IC59

[m][ns]

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At Level2 scripts there is only one type of SLC hit cleaning implemented:

see: http://code.icecube.wisc.edu/svn/meta-projects/std-processing/trunk/scripts/IC59/

HLC and SLC hits of the same IC59 event

HLC readouts only

SLC readouts only

HLC + SLC readouts

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HLC+SLC recos check

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Output i3 file has the following pulses in the frame: OfflinePulseSeriesReco, TWOfflinePulseSeriesReco, OfflineSLCPulseSeriesReco

L3+ scripts: recos using HLC pulses

only•Add SLC and HLC pulses:OfflinePulseSeriesReco+OfflineSLCPulseSeriesReco

•Time Window Cleaning applied to the pulses sum• Do L2 muon recos (SPEFit8 CascadeLlhVertexReco, AtmCscdEnergyReco) for TWC(HLC+SLC) Pulses and repeat L3+ recos - no cuts applied!

Comparison between the reconstruction for HLC pulses only and

(HLC+SLC)

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Reminder: IC59 Level3+ cuts

-------------------------------------------------------– Energy reconstructed by AtmCascadeEnergyReco

• Energy > 10 TeV OR

– Zenith angle reconstructed by muon fit SPEFit8• Zenith > 80 deg

AND– Reduced likelihood rlogl of CascadeVertexFit

• Rlogl < 10 -----------------------------------------------------------------------

AND– FillRatioFromMean(radius=mean*1.1) > 0.5

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AtmCscdEnergyReco_Energy

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CascadeLlhVertexFit_rlogl

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SPEFit8_Zenith

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FillRatioFromMean

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Comparison of shapes of distributions for DATA and rescaled E^-2 Signal

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Conclusions

• Further analysis required:– Check efficiencies with new variables– Check reconstructions as a function of NCh,

energy– Add L1 fits: i.e. Tensor of Inertia

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Extra SLIDES

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SPEFit32_Zenith

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CredoFit_rlogl

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