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Summary of the Acoustic R&D Parallel S ession

Summary of the Acoustic R&D Parallel S ession. R. Nahnhauer DESY. AAL. Quo vadis ?. x. x. Mission (nearly) accomplished !. Four journal publications: Y . Abdou et al., arXiv : 1105.4339 , subm . to NIMA technical paper

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Summary of the Acoustic R&D Parallel S ession

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  1. Summary of the Acoustic R&D Parallel Session R. Nahnhauer DESY AAL Quo vadis? x IceCube Meeting Uppsala

  2. IceCube Meeting Uppsala

  3. x IceCube Meeting Uppsala

  4. Mission (nearly) accomplished ! Four journal publications: Y. Abdou et al., arXiv: 1105.4339 , subm. to NIMA technical paper R. Abbasi et al., APP 33(2010)277 speed of sound R. Abbasi et al., APP 34(2011)382 att. length R. Abbasi et al.,arXiv:1103.1216, subm. to APP noise&transients Five PhD Thesis Several Bachelor, Master, Diploma Thesis A lot of data could still be evaluated:  inclined speed of sound  noise sources  shadowing effects  frequency behaviour  etc., ect. IceCube Meeting Uppsala

  5. Sensor noise behavior stable over years: Compare 2009 2011 IceCube Meeting Uppsala

  6. IceCube Meeting Uppsala

  7. Distance: 10 cm Aim:  learn more about detector efficiency vs.  and   learn more about noise sources (get hits in both channels of one sensor nearly only from acoustic signals, i.e. from reconstructed events - hint that measured noise level is caused by sensor electronics) IceCube Meeting Uppsala

  8. Similar behavior found for later measurement with string D sensor IceCube Meeting Uppsala

  9. AachenAcoustic Laboratory IceCube Meeting Uppsala

  10. Check result of early 2011 Perform reciprocity calibration for AAL transmitters Do for SPATS3 - reciprocity cal. - hybrid cal. (use calibrated transmitter) IceCube Meeting Uppsala

  11. increase systematical error IceCube Meeting Uppsala

  12. IceCube Meeting Uppsala

  13. A one layer PVDF acoustic sensor. Thermoacoustic effect in water Sascha Cramer Bachelor thesis Sascha Cramer Oservations: Clean bipolar signal (thermoacoustics signal) Polarityinversionofthethermoacousticssignalataround 4 °C IceCube Collaboration meeting

  14. IceCube Meeting Uppsala

  15. signal strength ~ Gruneisen parameter  • First reliable direct comparison of signal strength in water and ice ! • Measurement confirms expectations for • Speed of sound • Frequency • Signal strength • Final calibration still • necessary IceCube Meeting Uppsala

  16. VenioRomamiterumcrucifigi. • Quo vadis, Domine? Quo vadis? From problems to success IceCube Meeting Uppsala

  17. How a hybrid radio-acoustic detector in ice could look like J. Berdermann1), M. Carson2), R. Nahnhauer1) 1)DESY, 2)Gent University Aim of the new simulation study  Check the general possibilities of a hybrid detector concept for a x*100 km3cosmogenic neutrino detector  Discuss some of the basic requirements for a necessary R&D program, as there are e.g. - new (robotic) drilling and deployment technologies - new power and communication systems - new type of cable integrated sensors - new data collection, reduction and transfer concepts - etc. pp It is NOT the aim of this study to work out a concept which tomorrow can be started to be build – the realistic timescale is at least of O(10years) A 2-3 orders of magnitude larger detector than ever built can not just be a blow-up of an older one but needs new ideas and techniques IceCube Meeting Uppsala

  18. The next radio detector at the Pole - ARA 37 clusters nearly without correlations per eventNo hybrid (acoustic) optionforeseen and possible holes too distant (1.3-2 km) holes not deep enough 148 holes IceCube Meeting Uppsala

  19. Don’t give up the hybrid idea for UHE neutrino detection still important because of : - Signal Identification - Noise Reduction - Detector Calibration - Event Reconstruction - Energy and Direction Resolution Acoustic technology may do for low cost at least part of the job, as long as better alternatives are missing Do now necessary simulations based onreasonable measurements Maryland 2009 Workshop IceCube Meeting Uppsala

  20. Comparison with radio triggers II (model dep.) 10 mPa 1 mPa 35% 16% 29% 11% 18% 6% IceCube Meeting Uppsala

  21. Conclusions For considered grid arrays in average about 10% of radio events have additional acoustic signal - ~80% of those give own acoustic trigger  depth dependence: 200-400 m would be ok the deeper the better (200-1000m gives factor 2)  threshold dependence 10 mPa would be ok the lower the better, particularly for lower energies  grid constant dependence 500 m spacing would be ok 333m spacing better, particularly for lower energies In general: reasonable number of coincident events detectable only with large scale detector (~400 km2) IceCube Meeting Uppsala

  22. IceCube Meeting Uppsala

  23. IceCube Meeting Uppsala

  24. IceCube Meeting Uppsala

  25. Ultimahoralatet IceCube Meeting Uppsala

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