ARENA 2006 University of Northumbria June 28 – 30, 2006
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Transcript of 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
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen3
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
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen5
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
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen6
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)
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen7
ANTARES DAQ System: Schematics
storeystorey
control roomcontrol room
control modulecontrol module
sensorssensors
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen8
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
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen9
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
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen10
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!
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen11
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
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen12
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
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen13
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
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen15
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)
?
June 28 – 30, 2006ARENA 2006 – University of Northumbria
Kay Graf University of Erlangen16
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