Summary of yet another Photonics Workshop AMANDA/IceCube Collaboration Meeting Berkeley, March 19, 2005.

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Presentation transcript:

Summary of yet another Photonics Workshop AMANDA/IceCube Collaboration Meeting Berkeley, March 19, 2005

Ice Model Basics Need to describe Fphoton(A,t) around light sources (muon tracks, cascades, flashers, standard candles) for simulations of AMANDA events Tables of Fphoton(A,t) are calculated using Monte Carlo propagation of photons through scattering and absorbing medium (ice) Dependence on distance, OM orientation, ice properties, etc Prefer to have simplifications (symmetries, averages, approximations) but must pay price for these

Light Scattering in South Pole ice flat for bubbles bubbles power-law for dust scattering by dust

Light Absorption in South Pole ice flat (weak temp. dependence) absorption by ice absorption follows dust profile

PTD vs. photonics: layering Bulk PTD Layered PTD photonics 2 3 2 1 2 3 2 1 2 3 2 average ice type 1 type 2 type 3 “real” ice

Photonics Workshop Agenda Introduction Kurt Woschnagg 10’ Photonics upgrades Thomas Burgess 10’ Status of photonics development Johan Lundberg 45’ New features Michelangelo D’Agostino 15’ Photonics with simuperl Markus Ackermann 10’ Wuppertal photonics production Christopher Wiebusch 10’ Discussion All 60’ Merging with Simulation Workshop

level2 photonics upgrades (Thomas Burgess) “Oldschool” version of photonics - one static global set of tables available - cannot unload tables New version - allow several tables loaded at once - enable table unloading - good for: finite muons multiple muons

Making photonics work (Johan Lundberg) Upgoing infinite muon Bug fixes Functionality rework: - finite muons Animations: muons in ice (bulk, layered) dN(t)/dt Light distribution dP(t)/dt Independent arriving photon pdf

New features (Michelangelo D’Agostino) Realistic flasher source (option #8) beamed flasher LED regular cosθ LED 6 tilted LEDs + 6 horizontal LEDS

New features (Michelangelo D’Agostino) 2. Hole ice (around flasher source)

High statistics table production Two sites: AliceNext (Wuppertal) SweGrid Some discrepancies between tables Make test tables Compare (Johan) If OK, high statistics tables

Using photonics in simulations (Rafael Lang) Buggy tables used for this, but still…

Photonics and IceCube Using ROMEO with Photonics Romeo simulates the waveform produced by light detection in ice needs to know photon arrival theta and wavelength for each photon estimates arrival direction, source distance and wavelength spectrum first option: produce photonics tables binned in arrival theta and wavelength (not available) too big tables and requires work on photonics (not practical) ROMEO has the needed information second option: use present tables ROMEO needs to guess arrival direction, position on photocathode and wavelengths of photons need to check estimation algorithm using photonics simulation itself estimate systematic uncertainty on waveform determination by ROMEO

Message: photonics is good to go Conclusion We have entered the post-Ped era: plenty of expertise at all levels Photonics debugged and understood we can do showers and muons tables contain what we expect them to It’s time to use it for physics simulations Message: photonics is good to go