Measuring track response in - PowerPoint Presentation

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Measuring track response in - PPT Presentation

the 35ton data David Adams BNL June 8 2016 DUNE 35t simreco Updated 08jun2016 1130 EDT Introduction G oals I would like to study detector response in the 35ton TPC We see clear tracks in 35ton data ID: 798630

response track ton 35t track response 35t ton reco dune sim bnl june adams channels 2016 apa sticky bad

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Slide1

Measuring track response inthe 35-ton data

David AdamsBNLJune 8, 2016

DUNE 35t sim/reco

Updated 08jun2016 11:30 EDT

Slide2

IntroductionGoalsI would like to study detector response in the 35-ton TPC

We see clear tracks in 35-ton dataClearly evident in collection viewOften (but not always) there are corresponding tracks in induction planesSee my talk at the the May 11 35-ton sim/reco meetingCan we compare signal shapes with MC?Bad channels, stuck bits and high noise make this challenging

D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 20162

Slide3

IntroductionProcedureMostly working in my own analysis module:

DXDisplay Repository: https://github.com/dladams/dune_extensionsDevelop and ask for tools that can be used in this and other environmentsTSI tools in dunetpc

Using sliced samples from recent reprocessing/pnfs/lbne/scratch/users/php13tkw/v05_10_00/slice/run*/*/lbne*_split.rootThanks to Karl for processing theseOnly looking at run 13843 right nowD. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 20163

Slide4

Bad channelsI tried using the bad channel list in dunetpcI.e. the service with channels listed in FCL file

I am working with regularly-updated head of dunetpcIt removes some bad channels but not all and it removes channels that appear to be goodSee following slidesShould I make my own bad channel list?

D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 20164

Slide5

TPC 1 spectrum keeping all channels

D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 2016

Slide6

TPC 1 spectrum excluding “bad” channels

D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 2016

Slide7

Sticky bitsSticky bits are commonAssume sticking any time the low six bits are all on or all off

I.e. ADC count is 63, 64, 127, 128, 191, 192, …, 4031, 40320 is underflow4095 is overflowFollowing pages show this is pretty commonI have modified my code so bins with sticky bits can be ignoredADC spectra have holes but look much nicerNew service StandardRawDigitExtractService

extracts data from larsoft RawDigit,subtracts pedestal andsets flag indicating underflow, overflow or sticky bitUsed here to identify sticky bitsD. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 20167

Slide8

TPC 1 sticky bits

D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 2016

Slide9

Channel zoom of preceding page

D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 2016

Slide10

NoiseWell known that much of noise is coherentI.e. strong correlation with nearby channels

But correlation is complex and strongest for groups of 64 or 32With many exceptions within these groupsFollowing page show overlay of a signal in a channel with the spectra from many other channels in the same group of 32Bins with sticky bits are removedSignal from track is evident in the spectraNoise shows strong albeit not perfect correlation

Assuming this spectrum is typical, it should be possible in some cases to use neighbors to estimate the background under the signalExcluding nearest neighbors polluted by signalSelect tracks where neighbors have consistent spectraD. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 201610

Slide11

ADC spectra from run 13843 event 1

D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 2016

11Pedestal-subtractedADC countTickChannel 938Neighboring channelsin same group of 32

Slide12

Plan of actionIdentify bad channels by eyeLook at 2D ADC spectra and sticky-bit plots

Ignore bins with apparent sticky bitsDevelop procedure for coherent BG estimationFind sets of channels with coherent BG signalsStart with groups of 32Can we include channels with different wire orientations?Must exclude channels with tracksSerious issue because our goal is to study the response to a track

I.e. neighbors are guaranteed to be polluted by track signalWe must avoid the nearest neighborsSurvey dataFind track peaks with BG that can be estimatedAccumulate BG-subtracted track spectraLike to have track angles—use reco (3D) tracks?D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 201612

Slide13

SW organizationDeveloping tools for “data preparation”Pedestal subtraction

Identification of bad channelsIdentification of bins with underflow, overflow or stuck bitsCoherent noise subtractionPackaging these tools as TSI services in dunetpcEasy to mix and match different service implementationsProvide high-level steeringHigh-level service that starts from larsoft RawDigit

And art module wrapper for this serviceBoth will work for all Dune detectors (35t, FD, protoDUNE)Use existing code where availableRepackage as servicesMore at next FD sim/reco meetingD. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 201613

Slide14

Summary/conclusionsI continue to look at 35t dataBut not a full-time activity

Goal to study the response to charged tracksCompare with and eventually tune MCThere are challenges to using the 35t data in this mannerMany bin with stuck bits—ignore theseHigh noise levelChannel-to-channel coherence provides an avenue to remove much of this noiseBut coherence is complicated and extends to a limited # channels

And there will likely be signal pollution in the channels used to estimate the noisePlan outlined for extracting response spectraDo we want to carry this out?Generally used code being packaged as dunetpc servicesD. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 201614

Slide15

ExtrasOnline-ordered channel-tick spectra w/o and w/ bad channelsExample track

spectrumCorrelation plotsD. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 2016

Slide16

Online-ordered spectrum for all channelsD. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 2016

Slide17

Online-ordered spectrum w/o “bad” channels”D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 2016

Slide18

Event 1, track 1

D. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 201618

Slide19

Track in collection planeD. Adams, BNL DUNE 35t sim/reco Track response in 35-ton June 8, 2016