RICE ICRC 2001 Aug 13 2001 1 Recent

RICE: ICRC 2001, Aug 13, 2001 1 Recent Results from RICE Analysis of August 2000 Data Dave Seckel for Dave Besson for the Rice Collaboration correspondence: dbesson@ku. edu See also: HE 228: Ice Properties (contribution) HE 241: Shower Simulation (poster)

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 2

RICE: ICRC 2001, Aug 13, 2001 Radio Detection of High Energy Neutrinos Goals Pe. V: AGN 1 km 3 Ee. V: GZK 103 km 3 Coherent radiation S ~ DQ ~ 0. 25 Es/Ge. V l ~ RM ~ 10 cm Transparency > 1 km Thermal noise @ 250 k 3

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

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

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

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

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% 8

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 9

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 ? 10

RICE: ICRC 2001, Aug 13, 2001 EM pulse (see HE 241) 1. 2. 3. Angular distribution OK Spectra differ slightly All differences from shower Experimental results (Saltzberg, et al. ) confirm coherence and Askaryan effect 11

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

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

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

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

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 d. B 16

RICE: ICRC 2001, Aug 13, 2001 Individual channel calibration 17 HP 8713 C NWA 0 -1000 MHz 200 -500 MHz: +/- 6 d. B • antenna + amplifier calibrations • cable (TX, RX) and filter • relative geometry of TX/RX (r, q)

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

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

RICE: ICRC 2001, Aug 13, 2001 Effective Volume 20 Ideal 1 hit, 1 s, l GHz 1 km 3 @ 100 Pe. V RICE 2000 4 hits (hardware)

RICE: ICRC 2001, Aug 13, 2001 Offline Analysis 21 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, 2001 Model Flux Limits 22

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

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 km 3 @ 100 Pe. V • Flux limits about 100 above optimistic models (less than one month data) • RICE-2 (bigger V, lower E - AGN) and RICE-3 (1000 km 3 @ 1 Ee. V - GZK) 24

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

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. Mc. Kay, J. Ralston, S. Razzaque, D. W. Schmitz M. I. T. : • I. Kravchenko correspondence: dbesson@ku. edu 29

RICE: ICRC 2001, Aug 13, 2001 Equations 30

RICE: ICRC 2001, Aug 13, 2001 Single channel spectral response HP 8713 C NWA 0 -1000 MHz • antenna + amplifier calibrations • cable (TX, RX) and filter • relative geometry of TX/RX (r, q) 31

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

RICE: ICRC 2001, Aug 13, 2001 Spectrum 33

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