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Calibrating the first four Calibrating the first four IceCube strings IceCube strings Kurt Woschnagg, UCB Kurt Woschnagg, UCB L3 Detector Characterization L3 Detector Characterization IceCube Collaboration Meeting, Bartol, March IceCube Collaboration Meeting, Bartol, March 2004 2004

Calibrating the first four IceCube strings

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Calibrating the first four IceCube strings. Kurt Woschnagg, UCB L3 Detector Characterization IceCube Collaboration Meeting, Bartol, March 2004. Objectives for first four strings. What we need DFL measurements (gain, angular acceptance) → DB Timing (RAPcal, DAQ software) - PowerPoint PPT Presentation

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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