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F. Simeone – INFN, Sez. Roma1 RICAP07 Conference, Rome 20-22 June 2007 Data taking system for NEMO experiment RICAP07.

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Presentation on theme: "F. Simeone – INFN, Sez. Roma1 RICAP07 Conference, Rome 20-22 June 2007 Data taking system for NEMO experiment RICAP07."— Presentation transcript:

1 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Data taking system for NEMO experiment RICAP07 Conference F. Simeone on behalf of the NEMO Collaboration INFN Sez. Roma1

2 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Summary Introduction to NEMO project Experimental constraints and design choices Mini-Tower Layout and Floor Communication The tower optical transmission backbone The Front-End Acquisition board (FEM-b) The Floor Control Module board (FCM-b) Conclusions

3 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Introduction to NEMO project NEMO is an underwater neutrino telescope project Events reconstructed with Čerenkov photon detection Photo-Multipliers (PMT) are used as sensors Low electronic power consumption Small mechanical dimensions High reliability of each component Few connections to ease mechanical structures

4 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Expected Background rate ≤50kHz* PMT Signal Bandwidth <100MHz PMT full hit length ~70ns Timing coherency on the apparatus scale for hit “time stamping” Main Experimental Constraints *Measured with 10”PMT @ 0.3 s.p.e. threshold level 80kHz

5 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Design Choices Signal digitization: sampling  200MHz  Background bit rate per PMT is about 10Mbps  4 OMs produce about 40 Mbps per floor Communication Synchronous Protocol –Clock and bit stream on same transport medium Reduced number of fibers and connections –Compliant with DWDM standards Again, reduced number of fibers and connections Commercial products available –Fixed latency to partially embed time calibration

6 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 NEMO Mini-Tower Layout Deployed in Winter 2006: –30 km off the Sicily coast –2000 m depth The Tower is the basic unit: –Preserved full-tower specs –Floors are “independent” –Floor instrumentation can vary Main floor components: –Floor Control Module (center) –4 Optical Modules –Calibration Board –Slow Control Board –Acoustic Positioning Board –Oceanographic Instrumentation 40m 12m 200m

7 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Floor data communication Off-shore Floor FEM#2FEM#3 FEM#0FEM#1 1 Optical Module data come from 4 Front End Modules (FEM). Floor data are received on-shore by a twin FCM board, plugged on a host machine (FCM Interface) On-shore FCM GbE 3 FEB#0FEB#1FEB#2FEB#3 FCMI Data Manager Master CPU Data concentration is carried out by the Floor Control Module (FCM) Data are written into FCMI memory buffers (Front End Buffers, or FEBs) which contains formatted data produced from the respective FEM. 2 Optical Link FCM

8 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Optical Transmission Backbone TOWER DATA FLUXES Only some even floors are shown. For odd floors, a second backbone exists. to lower floor Add Drop Transceiver TX RX Transceiver TX RX Transceiver TX RX from lower floor 2 0 floor 4 0 floor 6 0 floor to upper floorfrom upper floor

9 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Analog conditioning: –anti-alias filtering –quasi-logarithmic compression => 13 bit –on-board calibration circuit –ADCs pedestal adjustment to exploit input dynamics Signal sampling: two 100 MHz 8bit-ADCs PMT HV management Low Power: 0.3A @ 3.3V Safe reconfiguration from remote Front End Module Board

10 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 FEM Board: Pmt signal path FCM – FEM Physical Interface Analog conditioning and Fast-ADCs for digital sampling of PMT signal Spartan IIE FPGA: L0 trigger, FIFO, data coding and line interface Compressed levels Typical spe signal

11 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 FEM Board: controls Local processor for start-up, debug and board monitoring On-board power regulators Local sensors (temperature, humidity) and front-end setup PMT electrical interface Serial interface for test, debug and stand- alone operations Flash EEPROM (remotely reprogrammable)

12 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Off-Shore - On-Shore Floor link Bridge between local components and fiber: –FEM Interface (proprietary protocol) –Slow Control Board –Time Calibration Board –Fiber optic interface (DWDM transceiver) Safe reconfiguration from remote Used on-shore for bidirectional communication: –Data distribution through PCI bus –Communication with Timing Station Floor Control Module Board

13 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 FCM Board: data bridge Electro-Optical Interface: Ser-Des (up to 1.4 Gbps) + DWDM compliant Transceiver Spartan-3 FPGA bridges optics and OMs Electrical Interfaces for up to 8 Optical Modules 3 Differential Lines:  Tx Clock line (5 MHz)  Tx Data line (5 Mbps)  Rx Data line (20 Mbps) Designed by A. Aloisio and supplied by INFN Napoli

14 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 FCM Board: interfaces PCI full size (4’’x12.2’’) Consumption: 1.5A @ 3.3V Freescale DSP56301 with PCI 32/33 interface: Board Debug System control and management On-shore data and slow control extraction Measured sustained performance: 60MBps Slow Control board connector: electrical link with SPI interface On-shore Connection: GPS Clock Input Timing Info Channel Time calibration connector: set calibration parameters trigger optical pulses to OMs

15 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Results: Charge Histogram (3rd floor, OM0, 17th Feb 2007) Charge Histogram calculated on 800000 raw hits: spe charge = 8 pC (gain = 5  10 7 ) good spe charge resolution we have few percent of two pe 8 pC peak

16 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Results: Time and Frequency Histogram (3rd floor, OM0, 17th Feb 2007) Hit Time-Difference Histogram: mean rate is ~82 kHz after-pulse bump @ 8us 8 us bump 40 kHz Instantaneous frequency Histogram: 40 kHz is the most probable value: 40 K

17 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Nemo Phase-1 Conclusions The synchronous protocol simplifies the overall design Transmission exploits optical passive devices The transmission latency is constant by design The FCM board implements a bridge between FEM boards and fiber optic and can be used on both sides of the optical link Usefulness of hit waveform for DAQ tuning Powerful mechanism of [safe] reconfiguration: –FEM acquisition algorithm tuned to measured bioluminescence activity –Eventually, even DAQ strategy could be changed to cope with data rate higher than expected (~2 times) and persistent bioluminescence activity (up to minutes)

18 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Back-up Slides

19 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Time Calibration Board Optical pulsers are used to illuminate the Optical Modules on request An optical fibre network is used to convey the light efficiently to the Optical Modules Reliable solution for km3 detectors where sensors can be spaced by several tens of meters. From lower floor To upper floor Time Cal Board Optical fibre FCM (Floor Control Module)

20 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Results: PMT Rate Monitor Floor n. 2 - 4 PMTs Rate Monitor Display

21 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Bioluminescence Floor n. 1 Bioluminescence burst

22 F. Simeone – INFN, Sez. Roma1 (francesco.simeone@roma1.infn.it) RICAP07 Conference, Rome 20-22 June 2007 Decompressed waveforms Decompression table measured with the apparatus in situ

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