IC40 Physics Run Preparations
Erik Blaufuss – University of Maryland
IceCube Science Advisory Committee
May 5-6, 2008
The TFT board
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TFT is a working committee within the
collaboration charged with determining:
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Trigger and DAQ settings for physics data taking
Online filters deployed to Pole and their settings.
TDRSS satellite bandwidth allocations.
Review allocations of non-physics data detector
allocations to support run coordinator
◦ Determine allocations of CPU resources at Pole
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TFT board members drawn from
◦ Run coordinator
◦ Subsystem experts (DAQ, online filtering)
◦ Several experts from physics analysis and simulation
The TFT board
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Physics working groups submit proposals for triggers, filters,
satellite bandwidth
◦ Reviewed by TFT
◦ TFT works to generate DAQ/filter settings
 Tuning filters based on information provided in proposals
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TFT has an established filter evaluation criteria, taking into
account:
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Matches physics goals of IceCube
Amount of resources being requested
Filter maturity
Results from previous years requests
No physics filter has had to be rejected to date
◦ A handful of filters this season tuned down somewhat to
accommodate satellite bandwidth constraints.
 Small impact on physics signal in each case.
IC40 Filtering
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IC40 physics run has already started.
◦ Began collecting data in IC40 configuration:
 April 11, Run 110811
 All request trigger and DAQ settings implemented
 I3DAQ and TWR DAQ events being merged and taped
◦ Filters for IC40 deployed
 April 17, Run 110847
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TDRSS bandwidth allocation well-filled.
◦ Total: 37 GB/day
◦ Slightly in excess of our goal of 35 GB/day but TDRSS
seems to be routinely delivering.
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CPU at pole ~85% loaded under normal rate
IC40 new triggers
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In addition to majority triggers used in previous
years, this year has two new triggers:
◦ 5 of 7 String trigger – Low energy muons
◦ ULEE trigger – 3 of 4 string trigger w/ large veto
 Experimental trigger/filter – very small rates.
 Aims to collect tracks ~10 GeV neutrinos
IC40 Filters – Upgoing muons
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Upgoing muon filter – single largest filter
◦ Select upgoing events based on log-likelihood
reconstruction zenith angle using I3-only data
 Fully efficient at ~1 TeV.
◦ Aimed at use in ATM neutrino, Point source searches,
and diffuse neutrino searches
IC40 Filters – Low Energy muons
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Three filters compliment standard muon
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Aim for filter efficiency at or below 100 GeV
Two use merged I3+TWR data
Low energy atmospheric neutrinos, WIMPs
Low-up filter –any LE event, I3+TWR, I3-only
JAMS filter – I3+TWR events with few I3 hits
Low energy contained filter – vertical tracks
from I3 string triggers.
Low Up filter signal efficiency
IC40 Filters – Cascades
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Two cascade filters, both select events based on
event topology
◦ I3 Cascade filter – higher energy cascades in I3 DAQ
data.
◦ LE Cascade filter – lower energy cascade sensitivity in
region around denser AMANDA
IC40 Filters - Others
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EHE filter
◦ Aimed at GZK neutrinos, tau neutrino searches, exotic particle
searches.
◦ Selects any event with ~600 pe total charge
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GRB filter
◦ Searching for neutrino (muon or cascade) signal coincident with
GCN alerts
◦ Obtain raw data from 2 hour window around GRB time, apply
special filters
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Cosmic Ray filters
◦ Spectrum and composition of primary cosmic rays
◦ Atmospheric muon spectrum
◦ Calibration events between sub-detectors
IC40 Filters - Others
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Moon filter
◦ Select cosmic ray events in region near moon
◦ Use moon shadow to verify ability to see point sources
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Downgoing contained filters
◦ 2 filters: use upper/outer strings as active veto to search
Southern sky for neutrino sources
◦ I3+TWR: seach for starting tracks near denser AMANDA region,
using I3 as veto
◦ I3-only: use deep portions of central strings as fiducial volume –
Study for Deep Core
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DST
◦ Record small event summary for all triggered events
◦ Collect high statistics sample of cosmic ray events, search for
anisotropy, seasonal variations…
IC40 Filters – By the Numbers.
IC40 trigger rate (I3+TWR) : 1340 Hz
 IC40 filter rate: ~80 Hz, 6% (no moon)
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http://internal.icecube.wisc.edu/status/detector-summary.xml
IC40 Filters – By the Numbers.
GB/day
9
8
7
6
5
4
3
2
1
0
Total: 32.5 GB/day
IC60 Planning
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Preparations for next seasons physics run are now just
underway.
“IC60” represents first year with a more incremental
upgrade.
◦ # of strings not doubling
◦ Online systems more mature
◦ Much more advanced and capable simulation.
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Expect similar start to physics run
◦ Run IC40 filters until April 1, 2009
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Earlier deadlines for IC60 TFT requests
◦ September 1 : DAQ and trigger proposals
◦ November 1 : Filter and bandwidth proposals
Future filtering
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Looking for ways to do filtering better, and considering
several approaches.
For more mature analyses, do more data reduction
online and return smaller fraction of data from Pole
◦ Move higher level reduction steps to online filters
◦ Point source/upgoing neutrinos for example
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Tool to identify and tag/remove common atmospheric
muon background.
◦ Evolve to Level 1 filter for all neutrino filters
◦ More advanced algorithms now useable online on smaller
fraction of data.
◦ Needs collaboration-wide effort.