1. IC40 Physics Run Preparations
Erik Blaufuss – University of Maryland
IceCube Science Advisory Committee
May 5-6, 2008

2. The TFT board
TFT 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

3. The 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.

4. IC40 Filtering IC40 physics run has already started.
Began collecting data in IC40 configuration:
April 11, Run
All request trigger and DAQ settings implemented
I3DAQ and TWR DAQ events being merged and taped
Filters for IC40 deployed
April 17, Run
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

5. IC40 new triggers
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

6. IC40 Filters – Upgoing 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

7. IC40 Filters – Low Energy 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

8. IC40 Filters – Cascades
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

9. IC40 Filters - Others EHE filter GRB filter Cosmic Ray filters
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
Cosmic Ray filters
Spectrum and composition of primary cosmic rays
Atmospheric muon spectrum
Calibration events between sub-detectors

10. IC40 Filters - Others Moon filter Downgoing contained filters DST
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 Core
DST
Record small event summary for all triggered events
Collect high statistics sample of cosmic ray events, search for anisotropy, seasonal variations…

11. IC40 Filters – By the Numbers.
IC40 trigger rate (I3+TWR) : 1340 Hz
IC40 filter rate: ~80 Hz, 6% (no moon)

12. IC40 Filters – By the Numbers.
GB/day
Total: 32.5 GB/day

13. IC60 Planning
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.
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

14. Future filtering
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
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.