1. Photonics Implementation
Progress on
Photonics Implementation
Kurt Woschnagg, UCB
Mons, October 2003
For the photonics implementation group:
Ice description
Table production
AMASIM
Parametrization
Kurt W. (Berkeley)
Paolo D. (Madison)
Igor L. (London)
Stephan H. (Stockholm)
Peter N. (Brussels) !
!!! ?
Ped M. (Hawaii) ?
Consulting

2. Optical properties in AMANDA ice
From in-situ light sources in AMANDA we get (after some analysis):
If you ask “what is the absorption/scattering length?” don’t expect a simple answer!

3. 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

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

5. Photonics Implementation Action Items
1. Create photon tables (Paolo D.*, Igor L.)
Tables for full “millennium” ice done
Test tables (bulk, no scattering) done
2. Modify AMASIM (Stephan H.*)
New interface (new geometry, integral muons) ~done
3. Parametrize tables (Peter N.*, Daan H.)
Why: Tables are many and huge, not practical
NN fits to tables in progress
4. Upgrade reconstruction (Christopher W.?)
Why: Current Pandel functions fitted to old bulk ice
Pandel fit to new tables, table reconstruction,… to do
* talk to follow