UPDATE TO SN TRIGGERING

Karl Warburton

Iowa State University

8th January 2018

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NEW SAMPLES!

• Everyone should have received an email from myself on Christmas day / seen a Slack

message about new samples.

• 3 set of 1 million events – an event is a 2.5 ms (5000 tick) long continuous set of

detector readout. If the sample contains a MARLEY neutrino, it was generated at T=0 in

this window, though obviously hits produced at all times in the window.

• Has both TPC and PD readout.

• There are 3 samples (all with electronics noise “turned on”);

• Radiologicals only

• SN only

• Radiologicals + SN

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HOW TO ACCESS THE FILES

• The samples are all uploaded to tape, so that we can access them forever.

• They are further defined collectively into a “dataset” containing ~10k files;

• snb_radio_dune10kt_1x2x6_snb_timedep_bkg_reco

• snb_timedep_dune10kt_1x2x6_snb_timedep_bkg_reco

• snb_timedep_radio_dune10kt_1x2x6_snb_timedep_bkg_reco

• Currently the files are still in the /pnfs/scratch/ locations which they were generated in;

• /pnfs/dune/scratch/dunepro/MCC10-Production/SuperNovaSamples/v06_60_00/reco/*/files.list to get the

locations of all of the files – feed this into a job to run over all files.

• Eventually these files will get deleted and then we will have to pull the files off tape.

• DO NOT RUN OVER THE DATASET WITHOUT FIRST PULLING FILES OFF TAPE. I CANNOT STRESS

THIS ENOUGH. You WILL get angry emails from many SCD people about wasting resources.

• We will have to pull files off tape after we don’t use the ones in scratch for ~1 month.

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HOW TO PULL FILES OFF TAPE

• The easiest way is to start a screen / tmux / whatever session on a terminal and simply type either one

of the following;

• samweb run-project –defname=<defname> --parallel 4

• samweb prestage-dataset --defname=<defname> --parallel 4

• The top is what I use in NOvA, the bottom is something I was told by Tingjun. They are functionally equivalent.

• If you really want to run on a single file locally;

• samweb list-definition-files $dataset # (show the files in a dataset)

• samweb get-file-access-url $filename # (Get a SAM URL for a file)

• ifdh cp -D $url $directory # (Copy that file back)

• There is no reason why you can’t just prestage a single file though, especially because I’ve made

defintions for you;

• `<def>_1k_events` # First 10 files

• `<def>_10k_events` # First 100 files

• `<def>_100kevents` # First 1000 files

4

RUNNING OVER THE DATASET

• Continuing on previous work I’ve shown I ran over the whole dataset to improve stats.

• Also added some histograms to see the properties of the “primary electron” assumed to

be the first electron in the MCParticle cascade from the interaction.

• I’m about 99% sure this will be true for all SN interactions.

• It is the longest electron in ~95% of the SN interactions (from very unsceintific flipping through

of output).

• In the samples produced there are hits calculated using “FastHit” at thresholds of 10, 15,

20, 25, 30.

• Have worked out the spread in time, spread in channels, number of hits, summed ADC for

both all MARLEY hits, and only the primary electron.

5

HIT THRESH OF 10 ADC – ALL MARLEY HITS

6

HIT THRESH OF 10 ADC – PRIM E HITS ONLY

• Can see that all distributions are much

more localised (Time vs Chan) and

linear (Nhit vs Chan).

7

HIT THRESH OF 30 ADC – ALL MARLEY HITS

8

HIT THRESH OF 30 ADC – PRIM E HITS ONLY

• Again, highly localised.

• Can see that there isn’t a tremendous

difference between the 10 and 30 ADC

threshold, so hopefully don’t lose too

much efficiency in having a high threshold,

but will reduce background.

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SUMMARY

• Obviously have the analogous plots for

thresholds of 15, 20, 25 ADC.

• Have span up a small run where I tried to

see the whether the MARLEY hits would

fall into some clustering windows.

• Will have this ready – plus a plotting

macro so that I can “plot dump” better

soon.

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• In the image, the first number is the time range, and the second number

is the channel range – 0 represents all channels/time.

• These are hand-selected from trying to contain a majority of the Prim

El points – will see how well they work next week…

BACKUPS

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WHAT IS THE FAST HIT FINDER?

• Developed for the 35 ton – thanks to T. Blackburn, A. Booth, M. Stancari!

• Was initially designed for quickly looking at collection plane signals, but proved very helpful in

calculating signal/noise ratios.

• For collection planes it looks for two hits above a threshold. Calls this the time of the hit, and moves on.

Doesn’t work out hit width / hit integral.

• For induction planes it looks for the “crossing point” (where ADC is 0) and calls that the time of the hit.

Again, doesn’t work out hit width / hit integral.

• At the collaboration meeting there was feedback about ways to improve this to make it more

of a rolling sum from 0 in an effort to increase the sensitivity to some of the low charge hits.

• I still haven’t look at this, though Michelle is thinking of doing this so I will act as a minor partner in this.

• Tyler has made some improvements, but yet to make it into develop I believe.

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