Title: Preliminary Results on Hydrophones Energy Calibration with a Proton Beam
1Preliminary Results on Hydrophones Energy
Calibration with a Proton Beam
Giulia De Bonis University La Sapienza Rome,
ITALY
International ARENA Workshop May 17-19,
2005 DESY, Zeuthen
- Results at an intense low-energy proton beam in
- ITEP (Moscow),
- special thanks to Vladimir Lyashuk and Andrei
Rostovstev group - Nprotons 1010
- Eprotons 100 MeV, 200 MeV
2Overview
- Hydrophones Characterization (Frequency Response)
- Hydrophones Calibration on Proton Beam
- Future Developments
3BENTHOS (prototipe)
Piezo-Electric HYDROPHONES
RESON 4042 (modified)
previously used for 6 months at 2000 m depth.
Both hydrophones are pre-amplified ( 30 dB)
4Frequency Response -the Hydrophones Sensitivity
- Test at IDAC (CNR Roma)
- Data Analysis Results
5CALIBRATION - Frequency Response
IDAC Institute of Acoustics O. M. Corbino
Rome (Italy) http//www.idac.rm.cnr.it/ ?
UAL - Underwater Acoustics Laboratory
water tank (fresh water) with dimensions
6.0 m (length 4.0 m (width) 5.5 m
(depth)
remotely-operated transducer positioning system
capable of handling weights up to 100 kg on two
independent carriages
6Experimental Set-Up
Hydrophone
The signal source (Reson ACS 9060) produces a
5KHz to 25 KHz sine wave (frequency sweep with a
step of 0.5 KHz).
Spherical Transducer (Model ITC 1007)
1.5 ms
L2.8 m (depth)
d1 m (distance)
7CALIBRATION - Frequency ResponseRESULTS
-173 dB re 1V/1mPa
-183 dB re 1V/1mPa
Reson
Benthos
Hydrophones sensitivity is measured in dB re
1V/1mPa
8Protons Interaction in Water -the Acoustic Signal
- -Test at ITEP (Moscow) Proton beam
- - Preliminary Data Analysis Results
9Particles Interaction in Waterthe Acoustic
Signal
instantaneous localized energy deposition
local heating of the medium
Local density variation
PRESSURE WAVE
10The Bragg Peak
- If the proton energy is in the range 100-200
MeV, the most of the primary proton energy is
deposited at the Bragg Peak.
The Bragg Peak is a good approximation of a
localized high-density energy deposition in
water. Considering the Bragg Peak one can
simulate an acoustic source.
11ITEP Experimental Set-up June 2004
Dimensions 50.8 cm 52.3 cm 94.5 cm The 90
of the basin's volume is filled with fresh water.
NO control on temperature.
V.Lyashuk and A.Rostovstev group, G. De Bonis, G.
Riccobene, R. Masullo and A. Capone
Data Acquisition with 3 different hydrophones
B ? -173 dB re 1V/1mPa
R ? -183 dB re 1V/1mPa
T ? -133 dB re 1V/1mPa
Collimator
12Hydrophones Configuration
(Monte Carlo Simulation)
13TTX Data
BENTHOS
Hydrophones
RESON
ITEP
BCT Beam Current Transformer
14Hydrophones Data - a Zoom View
Electro-magnetic induced pulse
Typical pulse collected with 1010 protons _at_ 200
MeV
Acoustic Pulse related to protons
interaction Bipolar Shape
15Hydrophones Data Analysis FIT Operation
BENTHOS
RESON
ITEP
16Results - LINEARITY
Linear Fit
Bipolar Amplitude
BENTHOS Hydrophone
Proton Intensity
Total deposited energy 108 eV 2. 51010 2.5
1018 eV
17Results - LINEARITY
Linear Fit
18Results - LINEARITY
Linear Fit
19Collimator Diameter Dependance
20Number of entering protons
The voltage signal measured at the BCT channel is
proportional to the number of protons in the
emitted bunch. One can calculate Nproton using
the formula
Nproton ABCT V 2 C 108
where C is a parameter depending on machine
settings the C-value is given by machine
technicians.
More over, collimators, located downstream the
BCT, are used to modify the number of protons
interacting in water. We considered collimator
with diameter f 2, 3, 5 cm).
21Ebeam 100 MeV
Results (taking into accounts the effect of
collimators)
Nprotons ENTERING THE BASIN
22Future Plans
- Simulation (Geant4) of proton beam energy
deposition in water - Simulation of acoustic signal formation
- Development of a tool for open sea hydrophone
calibration (controlled sparker) - Simulation of acoustic signal from UHE neutrino
induced showers in sea water