IceCube Collaboration Meeting Ghent, October 9, 2007

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Presentation transcript:

IceCube Collaboration Meeting Ghent, October 9, 2007 Optical Properties of Ice and Our Modeling Thereof Kurt Woschnagg 1. Imperfections in the millennium ice model 2. The new ice model: AHA 3. Selected simulation results with AHA IceCube Collaboration Meeting Ghent, October 9, 2007

The millennium model Scattering Absorption Main uncertainties: ► measurements done horizontally → “smearing” of layer structure ► dearth of data below 2100 m → deep extrapolation with ice core data

Is a detailed model needed? Light flux from a muon in… …”bulk” ice …millennium ice

Is a detailed model needed? [Oxana Tarasova] AMANDA cascades (L2) PTD/MAMINT photonics/millennium

Unresolved systematics in the millennium model The Stephan plot Relative OM “sensitivities” by S. Hundertmark et al. millennium ice photonics AMASIM B C A depth 1900 1800 1700 1600 1500

Photonics Full Circle Test message: layer smearing observed stronger for absorption

Extending the Ice Map for IceCube Need to complement AMANDA data

Evidence for clean deep ice: flasher data PRELIMINARY

Evidence for clean deep ice: IC9 data/MC [Jon Dumm] Ratio of Exp / Sim Structure washed out in MC Not enough light near bottom in MC

Evidence for clean deep ice: IceTop/InIce coinc. [Tom Gaisser] ~0.5 EeV ~2000µ Known muon flux muon “visibility radius” propagation length (y2k)

Added full millennium ice layering The ice properties were measured with a homogeneous photon simulation. Added full millennium ice layering

Look at photons recorded at same depth as source… …where they spent their time: …what kind of ice they saw:

Smearing depends on source… 532 nm 470 nm 337 nm

Averaging over wavelength and distance

Wavelength/distance averaged layer smearing

Distinguishing scattering from absorption “Lundberg epiphany” Scattering regime Absorption regime inexact regime definition (→ knob to turn), but simple and fast

Ice model tweaking: layer unsmearing Final stretching stretch and repeat

Ice model tweaking: new extrapolation to deep ice Extrapolation was based on Vostok+Dome Fuji ice cores Deep ice too clean to use Dust Logger data Newer and better ice core data from EDML:

Ice model tweaking: new extrapolation to deep ice

The Additionally Heterogeneous Absorption model Amplitude- stretched Cleaner

The Additionally Heterogeneous Absorption model Main Uncertainties: Scattering/absorption regimes defined too crudely May have resulted in overstretching of absorption If modification needed: make more sophisticated analysis Deep ice may need update Complete analysis of bulk ice flasher data Compare with flasher simulations (need tables) Compare with Albrecht’s flasher calibration… http://wiki.icecube.wisc.edu/index.php/New_ice_model

Photonics full circle test with AHA Near…

Photonics full circle test with AHA Far…

Photonics full circle test with AHA Averaged over typical measurement distances

Simulations with AHA: did it help? [Oxana Tarasova] AMANDA cascades: background zreco Photonics tables: 20 m binning in source depth

Simulations with AHA: did it help? [Oxana Tarasova] AMANDA cascades: signal zreco Photonics tables: 20 m binning in source depth

Simulations with AHA: did it help? [Jon Dumm] SPE occupancy (IC22) Photonics tables: 40 m binning in source depth

Simulations with AHA: did it help? [Peter Niessen] Photonics tables: 80 m binning in source depth

Conclusions: Aha Akbar! AHA has improved MC/data agreement → Systematic uncertainty has been retired ► AMANDA simulation AHA seems to produce the expected effects Some indication that layer stretching was overdone More basic checks needed: Stephan plot, residual times, … ► IceCube simulation Effects weaker than expected Not obvious what is going on Try finer binning in photonics tables Compare simulations with one thing changing at a time (ice model, DOM efficiencies, simulation version, …)