Photonics Workshop Objectives
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Transcript of Photonics Workshop Objectives
Photonics WorkshopAMANDA/IceCube Collaboration Meeting
Berkeley, March 19, 2005
Going the last mile…
Photonics Workshop, Berkeley, March 19, 2005
Photonics Workshop Objectives
Review where we stand- Debugging/testing complete?
- Do we have all the tools we need?
Coordinate how we proceed- Final go for mass production
Photonics in IceCube- Do we have a plan? If not, make one
Photonics Workshop, Berkeley, March 19, 2005
Photonics Workshop Agenda
Introduction Kurt Woschnagg 10’
Status of photonics development Johan Lundberg 45’
Update on PSI Thomas Burgess 10’
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
Photonics Workshop, Berkeley, March 19, 2005
Ice Model Basics
• Need to describe photon(A,t) around light sources (muon tracks, cascades) for simulations of AMANDA events
• Tables of photon(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
Photonics Workshop, Berkeley, March 19, 2005
Light Scattering in South Pole ice
power-law for dust
flat for bubbles
bu
bb
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scattering by dust
Photonics Workshop, Berkeley, March 19, 2005
Light Absorption in South Pole ice
absorption follows dust profile
flat (weak temp. dependence)
absorptionby ice
Photonics Workshop, Berkeley, March 19, 2005
Light propagation codes: two approaches
PTD• Photons propagated through
ice with homogeneous prop.• Uses average scattering
• No intrinsic layering: each OM sees homogeneous ice, different OMs may see different ice
• Fewer tables• Faster• Approximations
Photonics• Photons propagated through
ice with varying properties• All wavelength dependencies
included• Layering of ice itself: each OM
sees real ice layers
• More tables• Slower• Detailed
Photonics Workshop, Berkeley, March 19, 2005
photonicsBulk PTD Layered PTD
PTD vs. photonics: layering
average ice type 1 type 2 type 3 “real” ice
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Photonics Workshop, Berkeley, March 19, 2005
PTD-based ice models
MAM, mamintasens16-layer“Kurt”, stdkurt, sudkurtbulkkgmf125
See talk on ice models at Madison AMANDA meeting in 2003 for details
Photonics Workshop, Berkeley, March 19, 2005
We’re getting there…
Photonics Workshop, Berkeley, March 19, 2005
frozen subglacial lake
airborne radar imaging (Blankenship et al.)
South Pole stationand AMANDA
IceCube
For IceCube:Are the dust layers horizontal
on km-scale?
Photonics Workshop, Berkeley, March 19, 2005
Discussion Topics• Table production: what, where, when• Systematics (special tables)• Special sources• Table fitting
– Do we still have a size/memory problem?– NN fits
• IceCube– L4?– Special needs:
• Extended ice table• DOM description
• Future complications– Non-horizontal dust layers (breaking the last symmetry)