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Presented by N. Budnev, Irkutsk State University 17-19 May 2005, Zeuthen

The High Frequency Noise as a Background for Acoustic Detection of High Energy Neutrino in the Lake Baikal. Presented by N. Budnev, Irkutsk State University 17-19 May 2005, Zeuthen. Baikal Collaboration. Institute of Nuclear Research, Russian Academy of Sciences (Moscow, Russia) :

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Presented by N. Budnev, Irkutsk State University 17-19 May 2005, Zeuthen

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  1. The High Frequency Noise as a Background for Acoustic Detection of High Energy Neutrino in the Lake Baikal Presented by N. Budnev, Irkutsk State University 17-19 May 2005, Zeuthen

  2. Baikal Collaboration Institute of Nuclear Research, Russian Academy of Sciences (Moscow, Russia) : V.M.Aynutdinov, V.A.Balkanov, L.B.Bezrukov,D.A.Borschev, I.A.Danilchenko, Ya.I. Davidov, Zh.-A.M.Djilkibaev, G.V.Domogatsky, O.N.Gaponenko, A.M.Klabukov, S.I.Klimushin, A.P.Koshechkin, B.K.Lubsandorzhiev, S.P.Mikheyev, A.I.Panfilov, D.P.Petuhov, P.G.Pokhil, V.A,Poleschuk, B.A. Shaibonov, E.A.Vyatchin, V.A.Zhukov Irkutsk State University (Irkutsk, Russia): N.M.Budnev, A.G.Chensky, O.A.Gress, T.I.Gress,O.G.Grishin, A.N.Dyachok, R.R.Mirgazov, Yu.V.Parfenov, A.A.Pavlov, A.A.Kochanov, G.L.Pan'kov, L.V.Pan'kov, V.Yu.Rubtzov, Yu.A.Semenei,B.A.Tarashansky Moscow State University (Moscow, Russia): L.A.Kuzmichev, M. Mehanov, E.A.Osipova, E.G.Popova, V.V.Prosin, A. Shirokov, I.V.Yashin Nizhni Novgorod State Technical University (Nizhni Novgorod, Russia): V.F.Kulepov, M.B. Milenin , S.V. Fialkovski St.Petersburg State Marine Technical University (St.Petersburg, Russia): M.I.Rozanov Kurchatov Institute (Moscow, Russia): A.I.Klimov Joint Institute for Nuclear Research (Dubna, Russia): I.A.Belolaptikov, K.V.Konischev,E.N.Pliskovsky, R.V.Vasiljev DESY -Zheuthen (Zeuthen, Germany): T.Mikolajski ,Ch.Spiering, R.Wischnewski

  3. Cherenkov EAS detector 80 m Hydrophone muons 90 m Acoustic impulse NT-200

  4. Search of acoustic signals from EAS Acoustic antennas EAS Detectors pinger

  5. The acoustic antenna Hydrophones Depth of central -6 m Depth of other – 4 m

  6. Search of acoustic signals from EAS Reconstructed pinger location

  7. False reconstruction Impulse from pinger Noise impulse

  8. The questions????????????????? What is a nature of the short acoustic impulses? Are they result of an interference or they are generated by point-like sources? How the point-like sources are distributed (near a surface and at shallow depth or in a water body)? Do up going impulses appear due to refraction and reflection from bottom? What’s about depth dependence of the noise? ????????????????????????????????????????

  9. The recorder to study the high frequency acoustic noise 1.4 m

  10. The gain – frequency characteristic.

  11. The depth dependence of noise 26.03.03.

  12. The depth dependence of noise 31.03.03. 22:55 00:34 STD [mPa] 02:32 Depth [m]

  13. The depth dependence of noise 05.04.03.

  14. Time dependence of noise 1300 m

  15. The amplitude spectral density 26.06.03.

  16. The amplitude spectral density 05.04.03. Gas seep?

  17. The amplitude spectral density 18.06.03. 06:37, strong rain 05:46, week rain

  18. The amplitude distribution of short impulses Number of impulses Amplitude, PSD

  19. Number of the sign change Number of impulses Number of sign change

  20. Length distributions of the bipolar impulses Number of impulses Length of the bipolar impulses, us/10

  21. The short bipolar impulse time

  22. Conclusions • Future of acoustic detection of super high energy neutrino essentially depend on success in war with background. • We have study carefully the last to win a victory. • Recorder with compact 3-dimensional antenna is required.

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