arena 2006 university of northumbria june 28 – 30, 2006

Kay Graf

Physics Institute 1

University of Erlangen

ARENA 2006University of Northumbria

June 28 – 30, 2006

Integration of Acoustic Neutrino Detection Methods

into ANTARES

Technical Realisation

•Planning and Aims•General Conditions•Setup and Technical Implementation

June 28 – 30, 2006ARENA 2006 – University of Northumbria

Kay Graf University of Erlangen2

Overview: Plans and Aimsevaluate the prospects of an acoustic neutrino detector

– with a dedicated 3-D array of sensors– investigate the acoustical background: noise and signals– located in a deep-sea environment

) within the framework of the ANTARES experiment

or

equip several storeys of the ANTARES detector with acoustic sensors



Instrumentation Line with

3acoustic storeys

(deployment foreseen

first half 2007)3 more Acoustic

Storeys in an additional line:

Plans to be finalized

ANTARES with Acoustics



N.G. Lehtinen et al., Astropart. Phys., 17 (2002), p. 279

Basic Conditions: Noise

• sensitive sensors: background noise (SS0)• broad sensitive frequency band ( )• as many sensors as possible: random coincidences• as many length scales as possible: coherence length



Basic Conditions: Technical

• global:– no interference with the rest of the detector– as little changes as possible

• on-shore: independent DAQ and control• off-shore:

– salt-waterproof/pressure resistant components– data rate · 20MbPS per storey– power consumption · 3W per storey

) 6 sensors per storey

- digitization: 500kSPS, 16-bit - continuous and synchronous read-out of

sensors (200kSPS – 500kSPS)



ANTARES DAQ System: Schematics

storeystorey

control roomcontrol room

control modulecontrol module

sensorssensors



ANTARES Setup: Changes

additional PC-Cluster for DAQ and control

replace ANTARES ASIC boards by dedicated acoustics ADC boards

replace ANTARES PMTs by

acoustic sensors



Sensors

ANTARES optical module:

PMT (10") in glass sphere

or

acoustical module:

2 sensors (piezo with

preamplifier) in one glass

sphere

hydrophones:

2 separate sensors

(commercial or custom)

connected via fan-out

or



Acoustic Sensors: Comparison

acoustical modules+ assured water tightness+ space for electronics+ no pressure on components

- position fixed- alters acoustic signal

hydrophones+ position free chooseable+ characteristics tuneable+ uniform directional

sensitivity

- assure water tightness- connection to control

module

sensitivity: -145 to -120 dB re. 1V/Pa (0.05 to 1V/Pa)

compare:SS0 ¼ 2.5mPa (1 – 100kHz)

complementary: use both!



Acoustic ADC Boardd

igit

al p

art

an

alo

gu

e p

art

•all components tested

•prototype board:

- designed, in production

- available for tests:mid of July

•programming in progress



ADC Board: Analogue Part

ADC(TI ADS8323)

Amplifier and Filter(mainly Linear Technology)

• 500kSPS continuous sampling) Nyquist-frequency 250kHz

• 16-bit resolution• bipolar input

) digitization of acoustical data

• low noise ( )• variable gain (1 – 500)• 10th order filter

(f0=128kHz, ·10-3@250kHz)

) amplification and filtering ofacoustical data

FPGA C

ADC ADC

A+F A+F



ADC Board: Digital Part

FPGA(Xilinx Spartan-3)

micro controller(STMicroelectronics STR710)

•encoding of acoustical data in ANTARES format

•timing of data and ADC•controls amplifier•data filter / down sampling

•slow control communication(settings and FPGA programme)

•programming of FPGA via flash ) updateable

FPGA C

ADC ADC

A+F A+F



Performance

• 3 (+3) storeys with 18 (36) sensors at 3 length scales ( )

• dynamic range ¼ 3mPa – 10Pa (RMS)

• read-out sensors continuously and synchronously at ¸ 200kSPS

• data rate 10 (20) MBPS

• flexible design (sensors, gain,filter)

?



Summary and Outlook

• 3 ANTARES storeys will be equipped with acoustic sensors

• conclusive and flexible concept for the integration

• currently in prototype and testing phase components

install acoustics components in 2007

arena 2006 university of northumbria june 28 – 30, 2006

Documents