Ice Shear Measurement using the deep AMANDA strings and IceCube flashers Kurt Woschnagg, UCB
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Ice Shear Measurement using the deep AMANDA strings
and IceCube flashers
Kurt Woschnagg, UCBLake Geneva, 4/24/07
http://wiki.icecube.wisc.edu/index.php/Ice_shear_measurement
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shear model
Ice temperature profilefrom AMANDA thermistors
Fill in IceCube data (5 strings)
× 9 years
AMANDA strings 11-13:► extend to 2350 m
► deployed Jan 1998
Note: flow is really 10 m at surface
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IceCube strings 48/57/58:► Surround 11/12/13► Newly deployed → (~)vertical► All DOMs have working flashers→ measure individual DOM-OM distances vs depth
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d1 d2
d3
(x1,y1)(x2,y2)
(x3,y3)
Known: x1, y1, x2, y2, x3, y3, v
Unknown: x, y, t0
d1 = (x1-x)2 + (y1-y)2 = v(T1 - t0)
d2 = (x2-x)2 + (y2-y)2 = v(T2 - t0)
d3 = (x3-x)2 + (y3-y)2 = v(T3 - t0)
(x,y)
√ √ √
T
flash time
prompt time
time [ns]
flashing
receiving
T0-less analysis through triangulation
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1. Merge TWR events with TestDAQ data (flasher pulse) 2. Assume reasonable T0 start values for AMANDA OMs 3. Make travel time histograms for all receivers 4. Fit leading edges (=prompt times+scattering) and
convert to distances (may require ice simulations)5. Triangulate: solve 3 equations for receiver OM's
(x,y,T0) 6. Plot fitted (x,y) vs depth
→ is there a trend? → is it along the flow direction?
→ at least upper limit on ice shear
Note: this measurement can possibly also be done with muon tomography [Martino Olivo/Carsten Rott]
Analysis Strategy
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Requirements Flashers on 48, 57, 58 operational
(only with TestDAQ for now) TWRdaq operational Deep OMs alive Deep OMs read out by TWR
(6 electrical, 18 optical) IceCube/TWR time synch to a few ns IceCube/TWR data merging
fusing should work (Steve M., Gustav W.)
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Will AMANDA trigger?
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Will AMANDA trigger? well…
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How vertical were strings 11-13 in 1998?
[Analysis and plots by Varun Gopalakrishna (UW)]
11 12
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Run Plan• Pilot runs
Determine suitable brightnessProvide data to develop analysis code– flash DOMs 33 and 48 on 48/57/58– two different intensities per flasher– 10 min/run → 2 hours
• Data runs– flash every DOM 40-54 on 48/57/58– flash a few DOMs 20-30 on 48/57/58– each run 5-10 min → 5-10 hours
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• Pilot runs delayed by AMANDA illness– Fixed now
• Pilot runs to be taken soon
• Want to get data taking out of the way before physics runs start
Status