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Combined Opto -Acoustical Sensor Modules for KM3NeT

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

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Combined Opto -Acoustical Sensor Modules for KM3NeT

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  1. Combined Opto-Acoustical Sensor Modules for KM3NeT AlexanderEnzenhöferon behalf of the KM3NeT consortium ARENA 2012 Erlangen, 19.06. – 22.06.2012

  2. KM3NeT • Water Cherenkovneutrinotelescope • Multi-cubic-kilometreinstrumentedvolume • Located in theMediterraneanSea • At least 300 verticalstructures (detectionunits) withseveralhundredmetreslength, housingphotosensors Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  3. Requirements • Relative positions of thephotosensorshave to bedeterminedwithprecisionbetterthan 20 cm (corresponding to nanosecondprecision in timing) • Dynamicenvironmentneedsconstantmonitoring • Long-termstability of all utilisedparts • Resistance to environmentalinfluences (salinity, pressure) Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  4. “AcousticPositioning System“ • Dedicatedacousticemitters at fixedpositions (seafloor) • Acousticreceiversalongeachdetectionunit • Multiple time delaymeasurements and subsequenttrilateration Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  5. Experience from AMADEUS Compass board Storey 2 “AcouBoards” Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  6. Comparison: Compass – acoustical sensors Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  7. Optical and acousticaldetectiontechnique Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  8. Acousticalsensor 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) Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  9. Basic conceptfor an Opto-Acoustical Module Opto-Acoustical Module (OAM, acoustic sensors inside glass sphere next to PMT(s)) Acoustic Module from AMADEUS (acoustic sensors inside glass sphere) Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  10. Single-PMTdesign • Cooperationwithcolleagues from INFN and INFN-LNS (Italy) • NEMO Phase II infrastructure • 13‘‘ glasssphere • 1 x 10‘‘ PMT • Deploymentplannedforthis year at Capo Passero (Sicily) Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  11. Results I 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 Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  12. Multi-PMTdesign • Cooperationwithcolleagues fromNikhef (Netherlands) • KM3NeT infrastructure • 17‘‘ glasssphere • 31 x 3‘‘ PMTs Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  13. Results II Frequency spectrum of the OAM noise next to 5 powered PMTs Time domain signal for knocking on the glass sphere Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

  14. 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 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 Alexander Enzenhöfer, ARENA 2012, 19.06. - 22.06.2012

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