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