IC40 Physics Run IC40 Physics Run PreparationsPreparationsErik Blaufuss – University of MarylandIceCube Science Advisory CommitteeMay 5-6, 2008
The TFT boardThe TFT boardTFT is a working committee within the
collaboration charged with determining:◦ 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
TFT board members drawn from◦ Run coordinator◦ Subsystem experts (DAQ, online filtering)◦ Several experts from physics analysis and
simulation
The TFT boardThe TFT board 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 TFT has an established filter evaluation criteria,
taking into account:◦ 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 FilteringIC40 FilteringIC40 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
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.CPU at pole ~85% loaded under normal
rate
IC40 new triggersIC40 new triggersIn 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 IC40 Filters – Upgoing muons muons 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 IC40 Filters – Low Energy muons muons Three filters compliment standard
muon◦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 – CascadesIC40 Filters – CascadesTwo 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 - OthersIC40 Filters - OthersEHE filter
◦Aimed at GZK neutrinos, tau neutrino searches, exotic particle searches.
◦Selects any event with ~600 pe total charge
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
IC40 Filters - OthersIC40 Filters - OthersMoon filter
◦ Select cosmic ray events in region near moon◦ Use moon shadow to verify ability to see point sources
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 CoreDST
◦ 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 IC40 Filters – By the Numbers.Numbers.IC40 trigger rate (I3+TWR) :
1340 HzIC40 filter rate: ~80 Hz, 6% (no
moon)
http://internal.icecube.wisc.edu/status/detector-summary.xml
IC40 Filters – By the IC40 Filters – By the Numbers.Numbers.
GB/day
Total: 32.5 GB/day
IC60 PlanningIC60 PlanningPreparations 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.
Expect similar start to physics run◦ Run IC40 filters until April 1, 2009
Earlier deadlines for IC60 TFT requests◦ September 1 : DAQ and trigger proposals◦ November 1 : Filter and bandwidth proposals
Future filteringFuture filteringLooking 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
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.