I.2. Radio-detection of extensive air showers Part II Olivier Martineau-Huynh TREND workshop, April…

I.2. Radio-detection of extensive air showersPart II

Olivier Martineau-HuynhTREND workshop,

April 19, 2013

Expected distribution

• CODALEMA antennas oriented along East-West direction: sensible to x component of EEAS field only.

EEAS . x skymap

Expected distribution

• Trigger

Scintillator trigger

efficiency

Expected distribution

• « Toy model » distribution… matches well experimental one!

D. Ardouin et al., Astropart . Phy 1376 (2009)

CODALEMA EAS radio-detection

D. Ardouin et al., Astropart . Phy 1376 (2009)

Shower energy (scintillators) (log)

E rad

io

• Energy calibration (CODALEMA):• correction for geomagn. effects

• Scales linearly with shower energy

CODALEMA energy determination

Eradio =A0

. cos g

• Radial amplitude profile: exponential fit gives A0, λ0, x0, y0

A0

Eradio (µV/m) a E (eV)

distance to shower axis [m]

Fiel

d am

plitu

de [μ

V/m

] T. Saugrin PhD thesis

T. Saugrin PhD thesis

arxiv.org/abs/1301.2557v1

LOFAR

• But warning:

arXiv:1302.2733v1

Composition determination

XmaxXmax

Beaming of radio emission due to relativistic effects

Smaller pseudorapidity for deep showers, clearly correlated to steeper radio profile…

Simulationarxiv.org/abs/1301.2557v1

High

er X

max

Polarization measurements• Good tool to understand radio signal generation

geosynchrotron vs chareg excess) & cross-check models.

AERA: 161 stations over 20km² @ AUGER site (Phase 2, March 2013)

AERAPhase 1 result

arXiv:1302.2733v1

EAS Radio-detection strong points• Measurement of direction of origin, energy, nature of primary• Easiness of deployment & cost! Well suited to giant arrays!

15k€/unit3 tons

<1k€/unit (?)<10kg (?)

AUGER CODALEMA

Large interest / excitement in the EAS community… many R&D projects.

Conclusion

• Promising & obvious progresses• … But:

Self-triggering & EAS identification?Larger arrays?

Threshold?

Results to be refined & confirmed (energy determination, composition study, polarization studies, modelization)

TREND phase 1

Applications other than UHECRs??

TREND phase 2

TREND phase 2