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Acoustics PowerPoint PPT Presentation


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Acoustics. (Activity of ITEP group). V.I. Albul 1) , V.B. Bychkov 1) , V.S. Demidov 2) , E.V. Demidova 2) , K.E. Gusev 2) , N.K.Krasnov 1) , A.F. Kurchanov 1) , V.E. Lukyashin 2) , V.I. Lyashuk 2) , E.G. Novikov 2) ,

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Acoustics

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Acoustics

(Activity of ITEP group)

V.I. Albul 1), V.B. Bychkov 1), V.S. Demidov 2), E.V. Demidova 2), K.E. Gusev 2),

N.K.Krasnov 1), A.F. Kurchanov 1), V.E. Lukyashin 2), V.I. Lyashuk 2), E.G. Novikov2),

A.A. Rostovtsev2), A.Yu. Sokolov2), S.S. Vasil’ev 1), D.N. Zaborov2)

1) Mendeleev All-Russia Research Institute for physics-technical and radio-technical measurements,

Mendeleevo, Moscow region

2) Scientific Center of Russian Federation Institute of Theoretical and Experimental Physics ( ITEP ),

Moscow

1. Proton beam measurements

2. Acoustic signal simulation

3. Sensitive hydrophone manufactiring

4. Experiment at the Lake Baikal


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Two experiments with proton beam at ITEP

Proton beam: 200 MeV / ~70 ns / 108 – 1012 protons / Diam = 1-5 cm

  • Measurement of the signal

  • shape and propagation inside the

  • water volume.

II. Measurement of a tempera-

ture dependence of the acoustic

signal formation.

P

P


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Propagation of the acoustic signal

Proton

beam

Time [mks]

A structure of the acoustic field as measured by a movable

hydrophone synchronized with the proton beam.

Sound sources

A: acoustic trace from

the absorbed beam

B-D: acoustic signal

from the Bregg peak

A-C: acoustic signal

from beam entry point

These 3 sound sources define a structure of the recorded signals.


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Measurement of the temperature dependence

The temperature was varied between about 1o C and 8o C

At T~4oC the acoustic signals change polarity and get broader

Amplitude

~4oC


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Simulation of an acoustic signal

calculations

energy deposition in water E = 3.2 E+17ev, distance 0.32m (compared to the model of G.A.Askarian )

The model underestimates the ITEP proton beam measurements

by factor of 2


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Deep water hydrophones ( ITEP, Moscow), used for searching of signals from extensive atmospheric showers and acoustic investigations in the experiment BAIKAL during expeditions of 2001 - 2003 years


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Scheme of the acoustic experiment

lake Baikal

March, 23 – April, 4 2003

Scintillator detectors (EAS trigger)

50 m

30 m

50 m

H1 (4 m)

B4 (4 m)

B3 (4 m)

G8 (9 m)

G7 (9 m)

B6 (4 m)

H2 (9 m)

H3 (14 m)

H4 (19 m)

hydrophones (name and depth shown)


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Hydroacoustic antenne of ITEP (Moscow), used for searching of signals from extensive atmospheric showers in the experiment BAIKAL


An example of detected sound hydrophones h1 h4 g7 g8 l.jpg

An example of detected sound (hydrophones H1-H4,G7,G8)

Arbitrary units


An example of detected sound hydrophones b4 b6 b3 l.jpg

An example of detected sound (hydrophones B4,B6,B3)

Arbitrary units

* This example presents a background signal (not a signal from EAS)


Distribution of the delays in the triangle of hydrophones located on a horizontal plane h2 g7 g8 l.jpg

Distribution of the delays in the triangle of hydrophones located on a horizontal plane (H2-G7-G8)

The ellipse corresponds to real physical sounds located near horizontal plane

φ

Sounds coming from or through the center of the experimental setup


Angular distribution of sources seen from h2 calculated from arrival times of signals at h2 g7 g8 l.jpg

Angular distribution of sources seen from H2, calculated from arrival times of signals at (H2-G7-G8)

sin 

3 “clusters”

 = 90º surface noise

 = 0º ???

 = -10º ???

noise channeling below ice due to temperature gradient ?

t8-t2 = ((d8-d2)/v)*cos *cos ( s- 82)

t7-t2 = ((d7-d2)/v)*cos *cos ( s- 72)


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Acoustic noise from Baikal water


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