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Recent Results from RICE

Recent Results from RICE. Analysis of August 2000 Data. Dave Seckel for Dave Besson for the Rice Collaboration correspondence: dbesson@ku.edu. See also: HE228: Ice Properties (contribution) HE241: Shower Simulation (poster). OUTLINE. Concept Deployment Status Event Rate Calculation

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Recent Results from RICE

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  1. RICE: ICRC 2001, Aug 13, 2001 Recent Results from RICE Analysis of August 2000 Data Dave Seckel for Dave Besson for the Rice Collaboration correspondence: dbesson@ku.edu • See also: • HE228: Ice Properties (contribution) • HE241: Shower Simulation (poster)

  2. RICE: ICRC 2001, Aug 13, 2001 OUTLINE • Concept • Deployment Status • Event Rate Calculation • Interaction rate • Detector efficiency and calibration • Simulation of signal generation • Propagation • Data Acquisition • Analysis • Preliminary ne flux limit from Aug 2000 • Summary

  3. RICE: ICRC 2001, Aug 13, 2001 Radio Detection of High Energy Neutrinos Goals PeV: AGN 1 km3 EeV: GZK 103 km3 Coherent radiation S ~ DQ ~ 0.25 Es/GeV l ~ RM ~ 10 cm Transparency > 1 km Thermal noise @ 250 k

  4. RICE: ICRC 2001, Aug 13, 2001 Deployment Status Pole: • 16 Rx (10 cm dipole) • 5 Tx • 3 Horns • 4 Oscilliscopes (x4) • DAQ • PCs • Pulse Generator • Dry hole Kansas: • Network analyzer • Antenna range

  5. RICE: ICRC 2001, Aug 13, 2001 Single Channel Power Filter Amp cable Amp in PV Splitter Scope Trigger generator PC Antenna

  6. RICE: ICRC 2001, Aug 13, 2001 Sample Trigger (surface event) Spectrum Time domain

  7. RICE: ICRC 2001, Aug 13, 2001 Event Rates for RICE • G is interaction rate to create a shower • e is detection efficiency

  8. RICE: ICRC 2001, Aug 13, 2001 G – interaction rate to create showers • function of energy, direction and position • f is local, after propagation through the Earth • models for s may vary up to 50%

  9. RICE: ICRC 2001, Aug 13, 2001 e - shower detection efficiency Monte Carlo Simulation + Calibration • Several unique features to RICE • Shower simulation + EM pulse calculation • Pulse propagation • Data acquisition and trigger • Offline analysis

  10. RICE: ICRC 2001, Aug 13, 2001 Shower simulations (see HE 241) • ZHS • GEANT • FLUKA Number of particles & track length differ 30% Is this good or bad ?

  11. RICE: ICRC 2001, Aug 13, 2001 EM pulse (see HE 241) • Angular distribution OK • Spectra differ slightly • All differences from shower Experimental results (Saltzberg, et al.) confirm coherence and Askaryan effect

  12. RICE: ICRC 2001, Aug 13, 2001 Tx locations from timing residuals

  13. RICE: ICRC 2001, Aug 13, 2001 Propagation (read HE 228) • Index of refraction • Absorption Simultaneous fit to Rx, Tx positions and n(z)

  14. Power Filter Amp cable Amp in PV Splitter Scope Trigger generator PC Antenna RICE: ICRC 2001, Aug 13, 2001 DAQ: Antenna to trigger

  15. RICE: ICRC 2001, Aug 13, 2001 Antenna calibration Measure ZA, h, (q, y) dependence Antenna Range

  16. RICE: ICRC 2001, Aug 13, 2001 Amplifer Gains • 14/3/2001 - 16/3/2001: 200 forced triggers w/thermal noise • Isolate deep and surface Amps using filter • Since 1/1/2001: stable +/- 1 dB

  17. RICE: ICRC 2001, Aug 13, 2001 Individual channel calibration HP8713C NWA 0-1000 MHz 200-500 MHz: +/- 6 dB • antenna + amplifier calibrations • cable (TX, RX) and filter • relative geometry of TX/RX (r, q)

  18. RICE: ICRC 2001, Aug 13, 2001 Pulse Shapes Model response for d-function impulse Rx response for square wave pulse

  19. RICE: ICRC 2001, Aug 13, 2001 Trigger logic

  20. RICE: ICRC 2001, Aug 13, 2001 Effective Volume Ideal 1 hit, 1 s, l GHz 1 km3 @ 100 PeV RICE 2000 4 hits (hardware)

  21. RICE: ICRC 2001, Aug 13, 2001 Offline Analysis From waveforms Also: acceptable c2 for vertex, and vertex below -50 m. Cuts pass ~85% of events in MC.

  22. RICE: ICRC 2001, Aug 13, 2001 Model Flux Limits

  23. RICE: ICRC 2001, Aug 13, 2001 Power Law Flux Limits

  24. RICE: ICRC 2001, Aug 13, 2001 Summary • Too many Dave’s • Many calibration steps – many unique to RICE • Could still be improved – but a number in every box • 1 km3 @ 100 PeV • Flux limits about 100 above optimistic models • (less than one month data) • RICE-2 (bigger V, lower E - AGN) • and RICE-3 (1000 km3 @ 1 EeV - GZK)

  25. RICE: ICRC 2001, Aug 13, 2001

  26. RICE: ICRC 2001, Aug 13, 2001

  27. RICE: ICRC 2001, Aug 13, 2001

  28. RICE: ICRC 2001, Aug 13, 2001 Tests for Figures

  29. RICE: ICRC 2001, Aug 13, 2001 RICE: Radio Ice Cerenkov Experiment Canterbury: • J. Adams, S. Seunarine Delaware: • D. Seckel, G. M. Spiczak Florida State: • G. Frichter Kansas: • C. Allen, A. Bean, D. Besson, D. J. Box, R. Buniy, E. Copple, D. McKay, J. Ralston, S. Razzaque, D. W. Schmitz M.I.T.: • I. Kravchenko correspondence: dbesson@ku.edu

  30. Equations RICE: ICRC 2001, Aug 13, 2001

  31. RICE: ICRC 2001, Aug 13, 2001 Single channel spectral response HP8713C NWA 0-1000 MHz • antenna + amplifier calibrations • cable (TX, RX) and filter • relative geometry of TX/RX (r, q)

  32. RICE: ICRC 2001, Aug 13, 2001 Signal Strength

  33. RICE: ICRC 2001, Aug 13, 2001 Spectrum

  34. RICE: ICRC 2001, Aug 13, 2001

  35. RICE: ICRC 2001, Aug 13, 2001

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