1Stefan Fliescher
Radio Detection of Cosmic Ray induced Air Showers at the
Pierre Auger Observatory
Stefan FliescherSupervisor Martin Erdmann3. Physikalisches Institut A
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The Pierre Auger Observatory
Buenos Aires
Santiago de Chile
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The Pierre Auger Observatory
70 km
70 km
1600 Water Tanks Surface Detector 24 Fluoresence Telescopes
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Detection of Cosmic Ray Induced Air Showers
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Detection of Cosmic Ray Induced Air Showers
p
ee
e
0
+
+
--
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Detection of Cosmic Ray Induced Air Showers
Running 100% of time Only snapshot of shower developement
p
ee
e
0
+
+
--
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Detection of Cosmic Ray Induced Air Showers
Fluorescence Light
Running 100% of time Only snapshot of shower developement
Calorimetric measurment of primary particle Dutycycle only ~13%
p
ee
e
-
0
+
+
-
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Radio Pulse: Geosynchroton Radiation
e
e
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Radio Pulse: Geosynchroton Radiation
e
e
e
e
e
Earth's Magnetic Field Vector
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Radio Pulse: Geosynchroton Radiation
e
e
Synchroton Radiation
Projection on the ground
e
e
Earth's Magnetic Field Vector
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Radio Pulse: Geosynchroton Radiation
e
e
Synchroton Radiation
Projection on the ground
e
e
Pancake thickness: ~ 1-10 m coherent > 1 m
Signal in Radio Regime 10-100 MHz
Earth's Magnetic Field Vector
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Radio Pulse: Frequency Content
Pancake thickness: ~ 1-10 m coherent > 1 m
Signal in Radio Regime 10-100 MHz
Tim Huege
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Radio Pulse: Frequency Content
Pancake thickness: ~ 1-10 m coherent > 1 m
Signal in Radio Regime 10-100 MHz
Running 100% of time Integrated signal of shower developement
Tim Huege
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BLS
Aluminum LPDAs externally triggered by scintillator plates
100 m
Auger Radio Detector 2007LPDA: Logarithmic Periodic Dipole Antenna
3.8 m
14
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BLS
Auger Radio Detector 2007
May to November 2007:313 Radio Events triggered In coincidence with the Auger Surface Detector
E 0.4 EeV 35 SD reco. __
Aluminum LPDAs externally triggered by scintillator plates
100 m
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BLS
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Auger Radio Detector 2007
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EW
NS
SD reconstruction: Ep ~ 2,1 EeV
60 290
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Angular Resolution
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Angular Resolution
3 antennas @ 100 m
SD ang. Res.: ~1.9 Tank distance 1500 m
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Radio Detection Efficiency
Efficiency: probabilityto see an amplitude with S/N14 in a single antenna, when the Radio Setup is triggered in coincidence with SD
*
show
er a
xis
R.
Measured
East-West Polarization
North-South Polarization
Monte Carlo
MeasuredMonte Carlo
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BLS
100 m
Auger Radio Detector 2008
Black Spider LPDAs
225 m
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BLS
100 m
Auger Radio Detector 2008
225 m
Black Spider LPDA
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BLS
100 m
Auger Radio Detector 2008
225 m
2 weeks of data taking 11.5106 recorded tracesCombine all traces within 3.5 s 75000 events = 3 antennas 1000 events = 4 antennas 19 events = 5 antennas 1 event = 6 antennas 35000 x reconstruction of angles
Challenge Self Trigger :
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Full Radio Sky
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Full Radio Sky
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Man-made Source Direction
~88km
N
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Man-made Source Direction
~88km
N
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Full Radio Sky
Integrated 2 weeks
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18:30 19:30Date 14.10.08:
Moving Radio Source
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18:30 19:3019:30 20:30
Date 14.10.08:
Moving Radio Source
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18:30 19:3019:30 20:3020:30 21:30
Date 14.10.08:
Moving Radio Source
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18:30 19:3019:30 20:3020:30 21:30
Date 14.10.08:
Moving Point Source: Thunderstorm
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Self Triggered + Coincident with SD
V
s
SD reconstruction: Ep ~ 0,84 EeV
22 219
Setup by our french collaborators
Acounis et al.
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AERA Collaboration
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The AERA Site
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Overview AERA
6 km
3 km
159 Detector Stations
1.5 km35
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Overview AERA
Power L
ine
Fence
1.5 km
159 Detector Stations
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Overview AERA
1.5 km
Dense Core22 @ 150 m
159 Detector Stations
Medium Density52 @ 250 m
Wide Spacing85 @ 380 m
Medium Density52 @ 250 m
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Sim. Detection Efficiency for Single Antennas
show
er a
xis
Rground*
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AERA: Sim. Effective Detector Size
Demand for successfull detection: 3 antennas have seen radio pulse
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AERA: Sim. Effective Detector Size
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AERA: Sim. Effective Detector Size
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AERA: Sim. Effective Detector Size
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AERA: Sim. Effective Detector Size
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AERA: Sim. Effective Detector Size
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AERA: Sim. Effective Detector Size
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AERA: Sim. Effective Detector Size
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Event Rate Estimate
Steeply falling flux ofcosmic ray spectrum :
: Growing effective detector size
Fold & Integrate them...
=3.3
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Event Rate Estimate per YearN
umbe
r of
Eve
nts
per
Year
Zenith: 0 - 60
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Num
ber
of E
vent
s pe
r Ye
ar
Event Rate Estimate per YearZenith: 0 - 60
Energy range previous radio experiments
Ankle : Transition from galactic to extragalactic
sources?
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Num
ber
of E
vent
s pe
r Ye
ar
Event Rate Estimate per YearZenith: 0 - 60
Energy range previous radio experiments
Ankle : Transition from galactic to extragalactic
sources?
Large systematic uncertaintiesup to 100% due to method
Small uncertainties robust estimate
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Antenna Developement for AERA2007: Alu LPDA
2008: Black SpiderWire LPDA
2009: Small Black Spider
Wind stabiltyBandwidthTransport & Maintance BandwidthCost & Producibility
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Radio Spectum and Antenna Sensitivity
Incr
easi
ng S
ensi
tivity
Alu LPDARadio Spectrum @ Auger Site
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Radio Spectum and Antenna Sensitivity
Incr
easi
ng S
ensi
tivity
Alu LPDARadio Spectrum @ Auger Site
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Radio Spectum and Antenna Sensitivity
Incr
easi
ng S
ensi
tivity
Alu LPDABlack SpiderSmall Black Spider
Radio Spectrum @ Auger Site
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Summary & Outlook
2007 Successful observation of radio emission from UHECRs at the POA
Analysis on Self Triggered DataMan Made Source, Thunderstorm, Looking for Cosmic Ray Candidates
Working French Self Trigger
Ongoing Construction of the Auger Engeneering Radio Array AERA
FR / NL / DE - Collaboration
Ongoing Series Production of 35 Small Black Spiders for the dense core of AERA
Radio promisses new insights to the nature of cosmic rays from 1017 1019 eV
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