AERA - Why everybody should start listening to radio 1 Florian - - PowerPoint PPT Presentation

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AERA - Why everybody should start listening to radio 1 Florian - - PowerPoint PPT Presentation

Feb 12, 2024 463 likes •629 views

AERA - Why everybody should start listening to radio 1 Florian Briechle 25/09/19 Overview Why is Radio? Production of Radio Emission How is Radio? Detector Principles of AERA What can we do with Radio? Results from Radio

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Florian Briechle 25/09/19

AERA - Why everybody should start listening to radio

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Florian Briechle 25/09/19

Overview

 Why is Radio? ➔ Production of Radio Emission  How is Radio? ➔ Detector Principles of AERA  What can we do with Radio? ➔ Results from Radio  How will Radio be? ➔ Outlook

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Florian Briechle 25/09/19

Alan Watson on Radio...

“During the London Conference, Greisen gave an invited paper (‘Highlights in Air Showers 1965’) which was insightful and influential and is still well-worth reading. Amongst the topics he discussed was the detection of air showers using the radio method which had just been demonstrated. Greisen commented ‘The technique is barely in its infancy.... We feel confident it is a significant breakthrough and further study will reveal ways of obtaining information about showers not available by other means’. His prediction would eventually turn

  • ut to be correct but it was to be an infancy lasting nearly 40 years.”

Alan Watson approves!

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Radio emission mechanisms

1st order: geomagnetic radiation

➔ Electrons/positrons deflected

in Earth's magnetic field B

➔ Polarized into direction of

Lorentz force

➔ Scales with angle between

shower axis and B

2nd order:charge excess / Askaryan effect

➔ Time varying net charge excess ➔ Electrons from air nucleus

knocked out

➔ Positrons annihilate in shower front ➔ Radially polarized towards

shower axis

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What is AERA?

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The Auger Engineering Radio Array

World's largest radio detector for cosmic rays

More than 150 autonomous radio stations on 17 km²

Taking data since 2011

Coincident measurements with SD and FD

Two different antenna types

➔ Log-periodic dipole

antenna (LPDA)

➔ Butterfly antenna 

Two polarizations

Sensitive in the range

  • f 30 – 80 MHz

LPDA Butterfly antenna

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Florian Briechle | briechle@physik.rwth-aachen.de

We also have drones!

Octocopter

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Florian Briechle | briechle@physik.rwth-aachen.de

Typical event

Circles: AERA station

Color: measured energy fluence

➔ No difference between measured signal in stations and fit  Well performed fit

Transform into v x B system to symmetrize event v: direction of shower B: Earth’s magnetic field

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Florian Briechle | briechle@physik.rwth-aachen.de

Measuring with Radio

Radio can measure all commonly used properties of cosmic primaries

Energy: clear correlation between SD and RD

RD observable Obtained via fit of event

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Florian Briechle | briechle@physik.rwth-aachen.de

Example 2: Xmax

Xmax: Measured footprint size is estimate for Xmax

Distance to Xmax Radio observable (related to size of footprint)

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Especially useful for Horizontal air showers

Extensive air showers with zenith angle θ > 60°

Radio (and muons) reach ground

EM and hadronic components die out earlier in atmosphere

Inclined showers have larger footprint on ground up to tens of km²

Can measure in regions where SD and FD are blind

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Radio is used worldwide

AERA LOFAR Tunka-Rex Ice-Top Arianne

Interesting times for Radio detection!

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What the future holds

Radio officially part of AugerPrime

First test stations already deployed

RadioUpgrade antenna Some people expressing their joy working with Radio

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… and also other experiments

GRAND: Giant Radio Array for Neutrino Detection

Observatory in China currently in testing,

final size: 200000 km² with 200000 antennas

Not feasible with SD or FD due to technological and money constraints

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Summary and Outlook

Radio detection has never looked as promising as now!

Feasible alternative (or addition) to standard detection methods

Cheap and easily handable

Results from AERA show competitive results with SD and FD

Future observatories will heavily use Radio

Looking for PhD? We can always use more manpower :)

(and if that did not already convince you, we also have a Radio Meme WhatsApp)