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Combined Opto -Acoustical Sensor Modules for KM3NeT. Alexander Enzenhöfer on behalf of the KM3NeT consortium ARENA 2012 Erlangen , 19.06. – 22.06.2012. KM3NeT. Water Cherenkov neutrino telescope Multi-cubic-kilometre instrumented volume Located in the Mediterranean Sea - PowerPoint PPT Presentation
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Combined Opto-Acoustical Sensor Modules for KM3NeT
Alexander Enzenhöfer on behalf of the
KM3NeT consortium
ARENA 2012
Erlangen, 19.06. – 22.06.2012
KM3NeT
Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012 2
• Water Cherenkov neutrino telescope• Multi-cubic-kilometre instrumented volume• Located in the Mediterranean Sea• At least 300 vertical structures (detection units)
with several hundred metres length, housing photosensors
Requirements
3Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
• Relative positions of the photosensors have to be determined with precision better than 20 cm (corresponding to nanosecond precision in timing)
• Dynamic environment needs constant monitoring• Long-term stability of all utilised parts• Resistance to environmental influences (salinity,
pressure)
“Acoustic Positioning System“
• Dedicated acoustic emitters at fixed positions (sea floor)
• Acoustic receivers along each detection unit• Multiple time delay measurements and
subsequent trilateration
4Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Storey 2
Compass board
“AcouBoards”
Experience from AMADEUS
5Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Comparison: Compass – acoustical sensors
6Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Optical and acoustical detection technique
7Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Acoustical sensor
8Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Small piezo cylinder (18 x 12 mm) with preamplifier inside aluminum tube(21 mm x 30 mm)
Mainamplifier board (61.5 x 32.0 mm) with Bandpass (2 kHz – 125 kHz)
Low power consumption: < 10 mA @ 3.3 V (Piezo + preamp)
< 40 mA @ 3.3 V (system including mainamplifier)
Basic concept for an Opto-Acoustical Module
9Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Acoustic Module from AMADEUS (acoustic sensors inside glass sphere)
Opto-Acoustical Module (OAM, acoustic sensors inside glass sphere next to PMT(s))
Single-PMT design
• Cooperation with colleaguesfrom INFN and INFN-LNS(Italy)
• NEMO Phase II infrastructure• 13‘‘ glass sphere• 1 x 10‘‘ PMT• Deployment planned for this
year at Capo Passero (Sicily)
10Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Results I
11Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Frequency spectrum for hydrophone (top)and OAM (bottom) for applied sinusoidal ultrasonic signal (30 kHz)
Frequency spectrum for OAMs showing interference with calibration device inside the module
Multi-PMT design
• Cooperation with colleaguesfrom Nikhef (Netherlands)
• KM3NeT infrastructure• 17‘‘ glass sphere• 31 x 3‘‘ PMTs
12Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Results II
13Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
Frequency spectrum of the OAM noise next to 5 powered PMTs
Time domain signal for knocking on the glass sphere
Summary and outlook
• Flexible design allows for sensor integration to different module layout
• Sensor and readout allows for different applications (positioning, marine science, acoustic particle detection, ...)
• No showstopper observed so far• Detailed investigation of acquired data• Identify and solve further technical difficulties• Some more tests in the final configuration• Tests under real conditions
14Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012
The research leading to these results has received funding from the European Community Seventh Framework Programme under grant agreement n. 212525 and from the Sixth Framework Programme under contract n. 011937