AJ Heroux with Teresa Montaruli
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Transcript of AJ Heroux with Teresa Montaruli
AJ Heroux with
Teresa Montaruli
Playing in the Snow!!
Outline– What is IceCube?
• History• Deployment• DOMS• IceTop
– Shadow of the moon• Motivation• Methods• Results
– Future Work– Work done with
DOMs
• AMANDA was the precursor to IceCube
• Roughly 600 PMTs• Buried at depths from
1500-2000 m• Pioneered the hot water
drilling used in IceCube• Still functional, will be able
to work with IceCube
IceCube – The Next Generation
• 4800 PMT• Buried at depths from
1500 to 2500 m• Much greater
sensitivity and accuracy over AMANDA
• Coincidences and veto by IceTop will help streamline analysis
Cherenkov Radiation and Neutrino Detection
• Created by ultra-relativistic particles
• This light is what the AMANDA/IceCube DOMs detect
• Similar to sonic boom or shockwave, but EM based
• For AMANDA/IceCube, produced by muons from muon neutrinos
• When DOMS are triggered in a row, there is a chance for a signal
Shadow of the MoonMotivations
• Calibration• Absolute Pointing
Accuracy• Angular resolution
Methods for Calibration
• Known neutrino sources – AGN, Supernovae, Accreting Black Holes….
or not• Moon/Sun Shadow with Atmospheric
Muons from Cosmic Rays
How to find the Shadow?
• Need to know where it is– Albrecht Karle’s code– My code: SLALIB– NASA JPL Ephemerides
• Accuracy– 10’ longitude, 3”
latitude
• Result: My code will be implemented in IceCube software
SunMoon
Declin
ati
on
in
Deg
rees
Sun and Moon Declination in Degrees - 2005
Calculating the Muon Deficit
• Need to know several key values– Atmospheric Muon Flux– Effective Area of IceCube– Radius of the Moon disc and Search
Bin
• From there we calculate– Expected Muon Events– Blocked Muon Events– Significance of the Deficit
Cosmic Ray Muon Flux
Images from Paolo Desiati, AMANDA Collaboration
Calculations for the MoonBased on 2005 Data
• Cosmic Muon Flux
• Search Bin
• Size of Moon
• Effective Area of IceCube
• Expected Background
• Blocked Events
• Significance of Deficit
AMANDA vs IceCube
31.39σ in 64 days1.88σ in 64 days38.92 in 98 days2.34σ in 98 daysSignificance
21898959336791010Events Absorbed
486568121444748356186756Events Expected
0.18 or 64 days0.18 or 64 days0.27 or 98 days0.27 or 98 daysMoon above 20 ۫۫
106 m²3·104 m²106 m²3·104 m²Effective Area
1°3°1°3°Angular Resolution
8.5·10-9 cm-2 sec-1 sr-18.5·10-9 cm-2 sec-1 sr-18.5·10-9 cm-2 sec-1 sr-18.5·10-9 cm-2 sec-1 sr-
1Cosmic Ray Flux
IceCubeAMANDAIceCubeAMANDA-II
SunMoon
Future Work• It will now be possible to calibrate
IceCube every month using this method.
• Starting in 2014, the moon will not reach the 20 degree cutoff until around 2017
STF Work: My Program
• Sorts through any test results generated by ReadSTFTest.pl from Hagar Landsman.
• Sorts data based on temperature of test, date of test, or on separate value from test.
• Multiple output options, and changing code from test to test is contained within first few lines of code.
Results
goodbad
good
Acknowledgements
• Teresa Montaruli – IceCube Collaboration• Hagar Landsman – IceCube Collaboration• Ed Mierkiewicz – UW Astronomy Dept• Bob Benjamin – UWW Physics Dept• The whole IceCube group especially
JuanCarlos Diaz-Valez, Jonathan Dumm, Alessio Tamburro, Albrecht Karle
• The other REU Students