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Phun with Photonics

Phun with Photonics. Berkeley IceCube Collaboration Meeting Michelangelo D’Agostino UC Berkeley March 20, 2005. New Special Features. new flasher LED source option new full flasher board source option, fully configurable from the steering file hole ice cylinder simulation

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Phun with Photonics

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  1. Phun with Photonics Berkeley IceCube Collaboration Meeting Michelangelo D’Agostino UC Berkeley March 20, 2005

  2. New Special Features • new flasher LED source option • new full flasher board source option, fully configurable from the steering file • hole ice cylinder simulation • full documentation can be found at amanda.berkeley.edu/~mdagost/photonics Michelangelo D'Agostino

  3. Flasher LED Source • photonics already supports an LED source as option #4 • photon direction is chosen from a cos distribution in zenith angle and uniformly in φ (relative to the LED source axis) Michelangelo D'Agostino

  4. Flasher LED Source • the flasher LED’s that are actually in the ice are considerably more beamed • the intensity is closer to Gaussian in  with a σ of around 14 degrees beamed flasher LED regular LED cos  Michelangelo D'Agostino

  5. Flasher LED Source • a new flasher LED source is available as source option #7 in the photonics steering file • it can be offset and rotated just like any other photonics point source 7 # Source type (1=isotropic, 2=cerenkov, 3=beamed, etc..) Michelangelo D'Agostino

  6. Full Flasher Board Source • I’ve also added a full flasher board source available as source option #8 • 6 horizontal LED’s and 6 LED’s tilted at 48 degrees • each LED can be turned on or off from an additional line in the steering file (existing steering files are unaffected) 8 # Source type (1=isotropic, 2=cerenkov, 3=beamed, etc..) 000000 111111 #Flasher board configuration (6 horiztonal and then 6 tilted, separated by a space) Michelangelo D'Agostino

  7. Full Flasher Board Source • 6 tilted LED’s only Michelangelo D'Agostino

  8. Full Flasher Board Source • view from above; very few up-going photons Michelangelo D'Agostino

  9. Full Flasher Board Source • 6 horizontal LED’s only Michelangelo D'Agostino

  10. Full Flasher Board Source • full board; fewer photons in the lower hemisphere Michelangelo D'Agostino

  11. Hole Ice Cylinder • we know quite a bit about South Polar ice (e.g. see Kurt’s famous unpublished ice properties paper) • unfortunately, to get strings in, we have to melt the pristine ice and let it refreeze • we expect the hole ice to be bubbly and more highly scattering • as of now, hole ice is taken into account through DOM sensitivity in the photonics efficiency file Michelangelo D'Agostino

  12. Hole Ice Cylinder • I’ve added an option to simulate a hole ice cylinder • only available for the full flasher board source • the cylinder can be turned on or off and it’s radius and effective scattering length can be adjusted from new lines in the steering file 1 # Hole ice cylinder-1 to turn on, 0 to turn off .3 # Radius of hole ice cylinder (m) .50 # Hole ice effective scattering length (m) Michelangelo D'Agostino

  13. Hole Ice Cylinder scatters in the hole ice Michelangelo D'Agostino

  14. Hole Ice Cylinder • I still need to investigate whether the hole ice cylinder has a measurable impact on, e.g. single string timing differences • I’ll investigate whether we can learn anything about the actual parameters of the hole ice from these as well Michelangelo D'Agostino

  15. Photonics: Take the Plunge... For more information (and example steering files): http://amanda.berkeley.edu/~mdagost/photonics linked from Kurt’s photonics portal Michelangelo D'Agostino

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