Status of 1.5.3 Detector Characterization a.k.a. Calibration & Monitoring
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Transcript of Status of 1.5.3 Detector Characterization a.k.a. Calibration & Monitoring
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Status of
1.5.3 Detector Characterization
a.k.a. Calibration & Monitoring
• Project Year 2 objectives (→ Mar ‘04)1. Calibration plan (first draft in March ‘03 – still circulating…)2. Define contents of calibration DB3. Define algorithms4. Monitoring interface for TestDAQ5. Monitoring plan (new L4 for monitoring: Rodin Porrata)
• Manpower1 FTE (UCB) + 0.5 FTE (UW) + 0.2 FTE (UD) + δ
Kurt Woschnagg, UC Berkeley
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Calibration Tasks
Low-level calibrations:• Timing 7 ns• Geometry 1 m• Charge, OM gain (lab, ice)• Angular OM acceptance (lab)• Optical ice properties
High-level calibrations:• Energy (cascades)• Vertex resolution• Pointing accuracy and angular resolution
DOM lab calibrations not included here
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Timing calibrationAutomatic, part of normal DAQ ops
1. Every waveform time-stamped (coarse, fine) locally in DOM
2. Clock calibration (RAPcal) to relate local times to global (master) time
3. PMT transit time measurement (in lab, in-situ with onboard LED)
Testing (post-deployment):- with flasher data- with muons (req. reconstruction)
Development and testing underway @LBL
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Calibration devices
• Standard candles (lasers) vertex, energy• Flasher boards geometry, timing, vertex,
energy, ice• Dust loggers ice properties• On-board LEDs charge, timing (transit time)
• Pressure sensors geometry, deployment
• Payout, drill, GPS geometry• Acoustic televiewer drilling
So far: physics requirements, cable issues
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Geometry calibration in 3 stages
►Stage 1 (~days)Combine deployment data: surface survey, drill log, pressure data, payout etc. One shot!
►Stage 2 (~weeks→days?)Interstring calibration with flasher dataRequires: timing calib.
►Stage 3 (~months→weeks→days?)Muon surveyRequires: timing calib., reconstruction
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Geometry calibration – Stage 1
Initial geometry from deployment data:
• GPS survey of surface locations
• Pressure sensors• Drill log• Well depth• Cable payout
+ Hole diameter from acoustic televiewer
→ Absolute OM positions within ~1 m
Time scale: days → day?
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Geometry calibration – Stage 2
→ Relative string positions within ~0.5 m Time scale: weeks → days?
Global interstring fit to flasher timing data
Does it work in IceCube?
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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
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Geometry calibration – Stage 3
Survey with downgoing muons
→ OM positions within ~0.3 m
Time scale: month(s) → weeks → days?
Test: finds artificial shifts
Development and testing on AMANDAdata underway @ UCB (Jeff Allen, Dima)
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Optical properties of ice
So what is left to do…
From in-situ light sources in AMANDA we get (after some analysis):
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Optical properties in IceCube
1. Are the dust bands horizontal over km-scale?
2. What happens below 2100 m?
3. Can we measure hole ice prop.?
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Calibration hardware
Flasher boards• Requirements document (ERD) finalized
• Each board has 12 LEDs (405 nm)6 horizontal for geometry6 at ~45° for cascade simulationAll 12 can be fired independentlyAdjustable light output
• Cascade energies up to 10 TeV (at least)
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Calibration hardware
Dust loggers
Conceptual design stage,but:• Experience at UCB• Proven method
Optimal placement: in IceCube corners andat AMANDA center
Deploy first season?
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Record of Northern climate variations at GISP2(Greenland Ice Sheet Project, 3054 meters)
Dust in ice core
Temperature record from ice core
Dust logger data
A dust logger in actionRyan Bay,
UCB
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DOM gain (charge) calibrationRelate measured charge to number of photoelectrons
• In lab (pre-deployment): measured for all DOMs → database- SPE peak- linearity- dynamic range- saturation- dependence on HV, temperature
• In situ (post-deployment): on-board LED, min-bias muon data- SPE peak- linearity? saturation?
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Calibration hardware
On-board LEDsHardware:
Separate UV LED on DOM main board
Purpose:Charge calibration: SPE peakTiming calibration: PMT transit time
Work in progress (@LBL):Light outputPulse widthOptical couplingPlacement
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Cascade energy calibration
~105 photons/GeV
In-situ light sources:
1. Flashers; up to 10 TeV2. Lasers; 1 TeV and up
Standard candles: absolute calibration in labRealistic cascade simulation (light distribution, timing)
• Overlay events to reach higher energies- saturation (database with lab measurements)- software
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Getting ready for the first strings
The first IceCube string is deployed in Dec ’04…then what?
Mainly calibrations in ’05
• Timing calibration• Reconstruction• Deployment daqAMANDA/IceCube cross calibrations:
- Common reconstruction- Coordinate system
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Dependencies by WBS element
• Reconstruction• Deployment• DAQ• AMANDA-IceCube integration• Software• Simulation• In-ice devices (in-situ light sources)
• Monitoring, database, …
help!