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Concept of the LORD experiment

Concept of the LORD experiment. V.Chechin for the LORD Collaboration. Layout of LORD. LORD Lunar Orbital Radio Detector. Moon. CR, neutrino. Multibeam inflatable parabolic antenna (D=5…25 m). 10 m. RF inflatable antennas. 5 m. Biconical feed antennas. satellite. Moon.

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Concept of the LORD experiment

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  1. Concept of the LORD experiment V.Chechin for the LORD Collaboration

  2. Layout of LORD LORD Lunar Orbital Radio Detector Moon CR, neutrino Multibeam inflatable parabolic antenna (D=5…25 m)

  3. 10 m RF inflatable antennas 5 m Biconical feed antennas

  4. satellite Moon

  5. Trigger system thresholds Square Law Detectors Dscr BPF 1th Beam Dscr BPF LNA & Dscr BPF Dscr BPF 2th Beam Trigger Trigger Logic of 2th Beam LNA OR 3th Beam LNA Trigger Logic of 3th Beam

  6. Basic parameters Number of beams M = 3 Satellite altitude h  5001000 km Antenna’s diameter D  1020 m System temperature T  300 K Beamwidth   0.1*0.1 Frequency range f  300700 MHz 4 channels with f  4050 MHz Time gate   20 ns Signal-to-noise ratio SNR  35

  7. Calculation scheme Antenna: f Emin(SNR, kT, Seff, f) Geometry: h, RM Radiation field parameterization: R*E(W,f,cos) Transmission through rough interface Directional pattern  Apertures (km2 ster) ACR, A & (W, Emin, f, h) Fluxes JCR, J Differential event rates JCR*ACR, J*A (1/eV/s) Integral event ratesJCR*ACRdW, J*AdW(1/s)

  8. Angular apertures (ster) Total apertures (km2 ster)

  9. Radiation field parametrization • The basic problem of finding the apertures is the calculation of the radiation field with allowance for its absorption and refraction on the rough interface as well as near-field effects. Instead of performing Monte Carlo simulations we used the known parametrization f02500 MHz. The function (f,W) for hadronic showers was found by fitting Monte Carlo results for ice in the form  A+B log(W) and scaling from ice to lunar regolith For neutrino-produced showers, W<y>W Transmission coefficient with allowance for wave divergence and lunar surface roughness (Dq from 2 to 5 degree)

  10. Differential aperture dA/d(nadir)

  11. CR and NU apertures: SNR=4 Over whole visible surface LORD cosmic rays LORD10 neutrinos

  12. COSMIC RAYS h=1000 km h=1000 km Diameter of parabolic antennas d=10 m Satellite altitude

  13. COSMIC RAYS h=1000 km d=10 m h=1000 km d=10 m

  14. Neutrino h=1000 km h=1000 km

  15. LORD10

  16. LORD and LORD10 limits on  flux 1 year LORD: azimuth=2p Eth=0.01V/m MHz LORD10: Eth=0.07V/m MHz azimuth=0.3 LORD10 Models: TD – topological defects; MPR – Mannheim, Proteroe, Rachen; WB – Waxman, Bahcal; GZK  min: NpEp—2, max: NpEp—1

  17. Torus parabolic multibeam antenna Frequency 3.7-4.2 GHz Gain 46 dBi Reflector size 7 m x 12.8m Beamwidth 1 x 2 degrees Arc Coverage 75 degrees Number of feeds 37

  18. CR and NU apertures: SNR=3 Over whole visible area cosmic rays LORD neutrinos

  19. CR and NU apertures: SNR=5 Over whole visible surface cosmic rays LORD neutrinos

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