Icecube dust loggers
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IceCube Dust Loggers. Kurt Woschnagg, Ryan Bay Physics Department, UC Berkeley Instrumentation Session IceCube Collaboration Meeting Bartol, March 2004. Borehole Dust-Logger. First-generation logger (mechanically drilled hole). Field Tested Pole-to-Pole. A dust logger in Greenland.

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IceCube Dust Loggers

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Icecube dust loggers

IceCube Dust Loggers

Kurt Woschnagg, Ryan Bay

Physics Department, UC Berkeley

Instrumentation Session

IceCube Collaboration Meeting

Bartol, March 2004


Borehole dust logger

Borehole Dust-Logger

First-generation logger

(mechanically drilled hole)


Field tested pole to pole

Field Tested Pole-to-Pole

A dust logger in Greenland

A dust logger in Antarctica


Record of northern climate variations at gisp2 greenland ice sheet project 3054 meters

Record of Northern climate variations at GISP2(Greenland Ice Sheet Project, 3054 meters)

Dust logger data

Dust in ice core

Temperature record from ice core


Motivations for an optical dust logger in icecube

Motivations for an optical dust logger in IceCube

  • Constrain horizontal variations

  • Improve depth resolution of ice model

    • Currently ~10 m using in situ OMs

    • Volcanic ash?

  • Bonus science

    (à la RICE, acoustic detectors, etc.)

    A hole in the ice is a valuable commodity

fast

crucial

calibs

hi-res


Dust layers dominate ice properties

Dust layers dominate ice properties

AMANDA:

Variations in

optical properties

correlate with…

…dust in

ice cores.


Km scale horizontal variations

Km-scale horizontal variations?


Siple dome west antarctica over 60 volcanic ash layers detected

Siple Dome, West AntarcticaOver 60 volcanic ash layers detected


Volcanic ash at south pole

Volcanic ash at South Pole

  • ~500 miles from SDM; altitude 3× as high

  • Known to exist

    Palais, J. M. et al.,

    GRL (1992)

    Cole-Dai, J. et al.,

    Ann. Glaciol. (1999)


Ash bands can improve simulations

Ash bands can improve simulations

Thin, extremely absorbing

ash bands introduced

“Standard” ice description

Zcog = depth (z) of center-of-gravity for reconstructed muon tracks

Analysis by Marek Kowalski


Simulation of volcanic ash layers in bubbly ice

Simulation of volcanic ash layers in bubbly ice

MC

Data


Strawman icecube dust logger design

Strawman IceCube dust logger design


Technicals

Technicals

  • Continuous laser, signal integration: 10 ms – 1 s

  • Sampling rate: ~50 Hz

  • Located at bottom of string, between weights (TBD)

  • Centered in hole, unobstructed view

  • 4 service-wire pairs from lowest breakout (@DOM59)

  • Connectors TBD

  • Readout during deployment (only)

    → slipring connection

  • Stand-alone DAQ or Integrated into deployment/drill


Issues

Issues

  • Irregular walls will degrade data quality

  • Dust log requires real-time depth readout

    → Pick-off deployment pressure

  • Must not jeopardize deployment

    • Time limit

    • No retrieval once drop (lowering!) begins

  • Slower rate (factor 2) through instrumented ice?

    Normal drop speed (15m/min): ~1 hour


Plan for icecube dust loggers

Plan for IceCube dust loggers

  • Total of 9 loggers

    - one in each of the six corners

    - three inside array

    (one of these at AMANDA center for cross-calibration with AMANDA dust profile)

  • First dust logger in first season (04/05, PY03)

  • Then two per season

  • Built & operated by UCB (at least first few)


Conclusion

Conclusion

  • Dust loggers are crucial calibration devices

  • Need to get one in early

  • Have experience, will travel


Simulation of volcanic ash layers in bubbly ice1

Simulation of volcanic ash layers in bubbly ice

MC

Data


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