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Calibrating the first four IceCube stringsCalibrating the first four IceCube strings
Kurt Woschnagg, UCBKurt Woschnagg, UCBL3 Detector CharacterizationL3 Detector Characterization
IceCube Collaboration Meeting, Bartol, March 2004IceCube Collaboration Meeting, Bartol, March 2004
Objectives for first four stringsObjectives for first four strings
What we needWhat we need DFL measurements (gain, angular acceptance) DFL measurements (gain, angular acceptance) →→ DB DB Timing (RAPcal, DAQ software)Timing (RAPcal, DAQ software) Charge (on-board LED, DAQ software)Charge (on-board LED, DAQ software)
GeometryGeometry Timing/geometry verification (flashers, muons)Timing/geometry verification (flashers, muons)
What we wantWhat we want Optical properties below 2100 mOptical properties below 2100 m Dust profile with volcanic ash bandsDust profile with volcanic ash bands Cross-calibration with AMANDA and SPASECross-calibration with AMANDA and SPASE Deep temperature profile Deep temperature profile → → ice flowice flow
Calibration devicesCalibration devices
Flasher boardsFlasher boards geometry, timing, vertex, energy, ice geometry, timing, vertex, energy, ice Dust loggersDust loggers ice properties ice properties On-board LEDsOn-board LEDs charge, timing (transit time) charge, timing (transit time)
Pressure sensorsPressure sensors geometry, deployment geometry, deployment Payout, drill, GPSPayout, drill, GPS geometry geometry Laser distance meterLaser distance meter well depth (geometry) well depth (geometry) ThermistorsThermistors ice properties ice properties Acoustic televiewerAcoustic televiewer hole diameter (drilling) hole diameter (drilling)
AMANDA, IceTop, SPASEAMANDA, IceTop, SPASE verification, cross-calibration verification, cross-calibration
In following yearsIn following years
Standard candles (lasers)Standard candles (lasers) vertex, energy, (geometry, x-calib) vertex, energy, (geometry, x-calib)
Geometry calibration in 3 stagesGeometry calibration in 3 stages
► Stage 1 (~days)Stage 1 (~days)
Combine deployment data: surface survey, drill log, Combine deployment data: surface survey, drill log, pressure data, payout etc.pressure data, payout etc.
► Stage 2 (~weeks Stage 2 (~weeks → days?→ days?))
Interstring calibration with flasher dataInterstring calibration with flasher data
Requires: timing calibrationRequires: timing calibration
► Stage 3 (~months Stage 3 (~months → weeks → days?→ weeks → days?))
Muon surveyMuon survey
Requires: timing calibration, reconstructionRequires: timing calibration, reconstruction
Geometry calibration – Stage 1Geometry calibration – Stage 1
Initial geometry from deployment data:Initial geometry from deployment data:
GPS survey of surface locationsGPS survey of surface locations Pressure sensorsPressure sensors Well depthWell depth Drill logDrill log Cable payoutCable payout
+ Hole diameter from + Hole diameter from
acoustic televiewer (?)acoustic televiewer (?)
→ → Absolute Absolute OM positions within ~1 mOM positions within ~1 m
Time scale: days Time scale: days →→ day? day?
Geometry calibration – Stage 2Geometry calibration – Stage 2
Take data with 8-10 Take data with 8-10 flashers on each stringflashers on each string
Dedicated calibration Dedicated calibration runs (length: TBD)runs (length: TBD)
Cross-calibrate with Cross-calibrate with AMANDA OMs and AMANDA OMs and flashers (string 18)flashers (string 18)
→ → Relative string Relative string positionspositions
within ~0.5 mwithin ~0.5 m
Time scale: weeks Time scale: weeks →→ days?days?
Global interstring fit to flasher timing data
Measuring ice flow with cosmic-ray muons
Rigid down to 2000 m
Stuck atbedrock
Lagging
1. Reconstruct downgoing muon tracks2. Find location for each OM that minimizes
its contribution to the reconstruction likelihood
Geometry calibration – Stage 3Geometry calibration – Stage 3
Survey with downgoing Survey with downgoing muonsmuons
→ → OM positions within ~0.3 mOM positions within ~0.3 m
Time scale: Time scale:
month(s) month(s) → → weeks weeks → → days?days?
Test: finds artificial shifts
Development and testing on AMANDAdata underway @ UCB (Jeff Allen, Dima)
Timing/geometry verificationTiming/geometry verification
Use reconstructed (downgoing) eventsUse reconstructed (downgoing) events IceCube muonsIceCube muons AMANDA muonsAMANDA muons SPASE coincidencesSPASE coincidences
In-situ light sourcesIn-situ light sources IceCube flashersIceCube flashers AMANDA flashers, lasersAMANDA flashers, lasers
Look at Look at time residualstime residuals amplitudesamplitudes reconstructed vertex positionreconstructed vertex position
Cross-calibrationsCross-calibrations
With AMANDA:With AMANDA: AMANDA light sources seen with IceCube stringsAMANDA light sources seen with IceCube strings IceCube light sources seen with AMANDA stringsIceCube light sources seen with AMANDA strings Separate and common (not in Y1?) reconstructionSeparate and common (not in Y1?) reconstruction Matching dust profilesMatching dust profiles
With SPASE:With SPASE:
Geometry survey – sensitive in depth coordinate (muon Geometry survey – sensitive in depth coordinate (muon tomography sensitive in x,y)tomography sensitive in x,y)
With IceTop:With IceTop:
Can we do something with 8 tanks?Can we do something with 8 tanks?
Ice Properties with first fourIce Properties with first four
Design, build, deploy first dust loggerDesign, build, deploy first dust logger Adaptable to IceCube holes?Adaptable to IceCube holes? Verify AMANDA dust profileVerify AMANDA dust profile Ash bandsAsh bands
Flasher dataFlasher data Optical properties from timing fitsOptical properties from timing fits Absorption/scattering below 2100 mAbsorption/scattering below 2100 m
ThermistorsThermistors Firm up deep temperature profileFirm up deep temperature profile Ice flow modelIce flow model