1 / 13

TeV Particle Astrophysics II Madison, WI, USA August 28 – 31, 2006

TeV Particle Astrophysics II Madison, WI, USA August 28 – 31, 2006. Towards Acoustic Detection of UHE Neutrinos in the Mediterranean Sea – The AMADEUS Project in ANTARES. N.G. Lehtinen et al., Astropart. Phys., 17 (2002), p. 279. Acoustic Detection of UHE Neutrinos.

lynne
Download Presentation

TeV Particle Astrophysics II Madison, WI, USA August 28 – 31, 2006

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. TeV Particle Astrophysics IIMadison, WI, USAAugust 28 – 31, 2006 Towards Acoustic Detection of UHE Neutrinosin the Mediterranean Sea – The AMADEUS Project in ANTARES

  2. N.G. Lehtinen et al., Astropart. Phys., 17 (2002), p. 279 Acoustic Detection of UHE Neutrinos energy deposition in (hadronic) cascade ) disc-shaped bipolar pressure pulse

  3. AMADEUS: Project and Objectives AMADEUS:ANTARES Modules for Acoustic Detection Under the Sea • evaluate the feasibility of an acoustic neutrino detector using a dedicated array of sensors • investigate the acoustic background: noise and signals at different length scales comparable to a future detector • test hardware/software and signal processing in a realistic surrounding • located in a deep-sea environment) within the framework of the ANTARES experiment equip several storeys of the ANTARES detector with acoustic sensors

  4. Simulations of an Acoustic Detector T. Karg, PhD Thesis, astro-ph/0608312 (2006) effective volume and energy threshold strongly dependent on detection threshold of sensors ) design and test efficient signal processing algorithms rate of correlated neutrino-like background events is not known, only random coincidences assumed ) measure with AMADEUS at different length scales 200 acoustic modules in Vinstr.=1km3

  5. anchor of Line0 Previous Studies at ANTARES site autonomous system with acoustic sensors inside Ti-cylinder on ANTARES test line (2005) successful data taking for 20h but limited capability (electronics noise, vessel) ) test data processing algorithms

  6. Previous Studies at ANTARES site SPY Hydrophone (CPPM Marseille) on MILOM (since 2005) storey of MILOM f (kHz) time (ms) P (Pa) time (ms) electronics and software fully working,but not sensitive to background noise (40dB loss) ) SPY II on next Instrumentation Line

  7. AMADEUS at ANTARES Instrumentation Line with 3acoustic storeys (+SPY II) (deployment foreseen first half 2007) ANTARES storey 2m 3 more acoustic storeys in another line (plans to be finalized)

  8. or From Optical to Acoustic Storey • Concept: • no interference with ANTARES optics •as little design changes as possible • Main changes: • sensors: optical modulestohydrophones or acoustic modules • off-shore digitization boards: ARS boardtoacoustic ADCboard • new on-shore PC farm

  9. Piezoceramic Sensors acoustic module:2 sensors (piezo with preamplifier) in one glass sphere hydrophones:2 separate sensors (commercialor custom) complementary:use both! + water tightness guaranteed + no design changes needed + no pressure on components - alters acoustic signal + position can be optimized + characteristics tuneable + better directional sensitivity - assure water tightness

  10. Sensor Characteristics – Prototype commercial hydrophones prototype (18 sensors in production) self-noise at SS0 level (lowest agitation) (SS0: noise PSD ¸20dB re Pa/Hz1/2 at 30kHz) sensitivity: measurement andfit from simple piezo model final version: + 10 – 15 dB self-noise: after post-amplification and filtering with ADC board in air, noisy surrounding

  11. Prototype Acoustic ADC Board • analogue part: • filtering (band pass) • amplification (1 – 562) • low noise (O[V/Hz1/2]) • digital part: • flexible design (FPGA) • continuous sampling (· 500 kS/sec, 16-bit) • formatting of data • communication to shore • transmission: 1.25 MS/sec per storey • 3 boards per storey, 2 sensors each • low power ( ¼ 1 W)

  12. ? Performance • 3 (+3) storeys with 18 (36) sensors at 3length scales( ) • dynamic range ¼3mPa – 10Pa (RMS) • read-out sensorscontinuously and synchronously at ¸ 200kS/sec • data rate 10 (20) MB/sec • flexible design (sensors, gain, filter) 1m 10m 100m

  13. Summary and Outlook • 3 ANTARES storeys will be equipped with acoustic sensors (option for 3 more) • dedicated setup to investigate the feasibility of an acoustic -detector • currently in prototype and testing phase of components Installation of AMADEUS in 2007 if acoustic detection proves feasible)use KM3NeT-infrastructure for acoustics?(not included in EU design study!)

More Related