radio detection of cosmic ray induced air showers at the ...kolleg/fileadmin/data/... · stefan...

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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p

ee

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0

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--

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Running 100% of time Only snapshot of shower developement

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ee

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Fluorescence Light

Running 100% of time Only snapshot of shower developement

Calorimetric measurment of primary particle Dutycycle only ~13%

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ee

e

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0

+

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-

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Radio Pulse: Geosynchroton Radiation

e

e

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e

e

e

e

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Earth's Magnetic Field Vector

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Synchroton Radiation

Projection on the ground

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e


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e

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Synchroton Radiation

Projection on the ground

e

e

Pancake thickness: ~ 1-10 m coherent > 1 m

Signal in Radio Regime 10-100 MHz


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Radio Pulse: Frequency Content



Tim Huege

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Radio Pulse: Frequency Content



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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15

EW

NS

SD reconstruction: Ep ~ 2,1 EeV

60 290

16

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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


Black Spider LPDAs

225 m

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BLS

100 m


225 m

Black Spider LPDA

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BLS

100 m


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


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Overview AERA

1.5 km

Dense Core22 @ 150 m


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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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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Incr

easi

ng S

ensi

tivity

Alu LPDARadio Spectrum @ Auger Site

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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

radio detection of cosmic ray induced air showers at the ...kolleg/fileadmin/data/... · stefan...

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