RICE: ICRC 2001, Aug 13, Recent Results from RICE Analysis of August 2000 Data See also: HE228: Ice Properties (contribution) HE241: Shower Simulation (poster) Dave Seckel for Dave Besson for the Rice Collaboration correspondence: RICE: ICRC 2001, Aug 13, OUTLINE Concept Deployment Status Event Rate Calculation Interaction rate Detector efficiency and calibration Simulation of signal generation Propagation Data Acquisition Analysis Preliminary n e flux limit from Aug 2000 Summary RICE: ICRC 2001, Aug 13, Radio Detection of High Energy Neutrinos Goals PeV: AGN 1 km 3 EeV: GZK 10 3 km 3 Coherent radiation S ~ D Q ~ 0.25 E s /GeV l ~ R M ~ 10 cm Transparency > 1 km Thermal 250 k RICE: ICRC 2001, Aug 13, Deployment Status 16 Rx (10 cm dipole) 5 Tx 3 Horns 4 Oscilliscopes (x4) DAQ PCs Pulse Generator Dry hole Pole: Network analyzer Antenna range Kansas: RICE: ICRC 2001, Aug 13, Single Channel Power Scope Trigger generator Antenna Amp in PV cable AmpFilter Splitter PC RICE: ICRC 2001, Aug 13, Sample Trigger (surface event) Time domain Spectrum RICE: ICRC 2001, Aug 13, Event Rates for RICE G is interaction rate to create a shower e is detection efficiency RICE: ICRC 2001, Aug 13, 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% RICE: ICRC 2001, Aug 13, 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 RICE: ICRC 2001, Aug 13, Shower simulations (see HE 241) ZHS GEANT FLUKA Number of particles & track length differ 30% Is this good or bad ? RICE: ICRC 2001, Aug 13, EM pulse (see HE 241) 1.Angular distribution OK 2.Spectra differ slightly 3.All differences from shower Experimental results (Saltzberg, et al.) confirm coherence and Askaryan effect RICE: ICRC 2001, Aug 13, Tx locations from timing residuals RICE: ICRC 2001, Aug 13, Propagation (read HE 228) Index of refraction Absorption Simultaneous fit to Rx, Tx positions and n(z) RICE: ICRC 2001, Aug 13, DAQ: Antenna to trigger Power Scope Trigger generator Antenna Amp in PV cable AmpFilter Splitter PC RICE: ICRC 2001, Aug 13, Antenna calibration Measure Z A, h, ( q, y) dependence Antenna Range RICE: ICRC 2001, Aug 13, Amplifer Gains 14/3/ /3/2001: 200 forced triggers w/thermal noise Isolate deep and surface Amps using filter Since 1/1/2001: stable +/- 1 dB RICE: ICRC 2001, Aug 13, Individual channel calibration HP8713C NWA MHz MHz: +/- 6 dB antenna + amplifier calibrations cable (TX, RX) and filter relative geometry of TX/RX (r, q) RICE: ICRC 2001, Aug 13, Pulse Shapes Model response for d -function impulse Rx response for square wave pulse RICE: ICRC 2001, Aug 13, Trigger logic RICE: ICRC 2001, Aug 13, Effective Volume RICE hits (hardware) Ideal 1 hit, 1 s, l GHz 1 km 100 PeV RICE: ICRC 2001, Aug 13, Offline Analysis From waveforms Also: acceptable c 2 for vertex, and vertex below -50 m. Cuts pass ~85% of events in MC. RICE: ICRC 2001, Aug 13, Model Flux Limits RICE: ICRC 2001, Aug 13, Power Law Flux Limits RICE: ICRC 2001, Aug 13, Summary Too many Daves Many calibration steps many unique to RICE Could still be improved but a number in every box 1 km 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 km 1 EeV - GZK) RICE: ICRC 2001, Aug 13, RICE: ICRC 2001, Aug 13, RICE: ICRC 2001, Aug 13, RICE: ICRC 2001, Aug 13, Tests for Figures RICE: ICRC 2001, Aug 13, 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: RICE: ICRC 2001, Aug 13, Equations RICE: ICRC 2001, Aug 13, Single channel spectral response antenna + amplifier calibrations cable (TX, RX) and filter relative geometry of TX/RX (r, q) HP8713C NWA MHz RICE: ICRC 2001, Aug 13, Signal Strength RICE: ICRC 2001, Aug 13, Spectrum RICE: ICRC 2001, Aug 13, RICE: ICRC 2001, Aug 13,