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Published byGeoffrey Fisher Modified over 9 years ago
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disk WP-4 “Information Technology” J. Hogenbirk/M. de Jong Introduction (‘Antares biased’) Design considerations Recent developments Summary
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“All-data-to-shore” photon detection information transmission information management information distribution detector f mf m f 1f 1 f f m+1 m minimum number of time-position correlated photons
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“All-data-to-shore” * Scientifically –maximise neutrino detection efficiency –maintain flexibility (also after construction) –enable different physics (e.g. Magnetic Monopole) Technically –reduce data transmission to a linear problem (scalability) –locate all complexity on shore (reliability) –optimisation of data filter (quality) * Maximum of event related data
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Status Antares established proof-of-principle of “All-data-to-shore” excellent time resolution → easy to find tracks access to L0 data (single photons), see next pages easy to include external triggers, see next pages NEMO mini tower operational readout also based on “All-data-to-shore” Nestor readout for 4-floor NESTOR tower ready, NuBE evaluation of commercial digitization system completed
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+ L0 ● L1 shower Cherenkov cone muon
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neutrino
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location of GRB detector All data before, during and after GRB alert save analysis Gamma-Ray Burst All data TCP/IP
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GRB time – earliest recorded raw data delay [s] number of gamma-ray bursts Access to data before GRBdelayed messages
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Design considerations
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Functional geography Photon detection –High data rate –Uni-directional –Low information density –Timing ~ns Instrumentation –Low data rate –Bi-directional –High information density –Timing ~ms separation of functionalities
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Separation of functionalities Optimise implementation Reduce cost Parallel design/production * Reliability versus redundancy Detection UnitsInstrumentation Units requires proof of concept for calibration *Critical path relaxation
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Photon counting Large detection area PMT –Slow –Analogue –Q -integrator –ADC Small detection area PMT –Fast –Digital –single photon counting –Time-over-threshold two-photon purity photon is digital!
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Probability to detect 2 (or more) photons as a function of photo-cathode area distance between muon and PMT
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wavefront Cherenkov light cone ~1 km 1-2 abs
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R [m] P(# ≥ 2) – 0.01 m 2 – 0.02 m 2 – 0.03 m 2 – 0.04 m 2 – 0.05 m 2 Probability to detect 2 (or more) photons QE = 25% photo-cathode area: 2 x larger PMT does NOT see twice as far
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Time stamping Off-shore TDC –Distributed clock system Master clock Time calibration Network Many slave clocks –“Store and Forward” readout On-shore TDC –Local clock system Master clock Time calibration ‘smart’ TDCs –“Real-time” readout Software (protocol) Hardware (‘analogue’) minimise off-shore electronics
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Time slice (or “ how-to-get-all-data-in-one-place ”) time muon takes to traverse detector ~
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Trigger time Ethernet switch off-shore on shore
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Trigger time Ethernet switch off-shore on shore
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Trigger time Ethernet switch off-shore on shore
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Design concepts à la Antares 1-1 mixed: copper riser / fibre backbone photonics based
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à la Antares Design of new front-end chip (Guilloux, Delagnes, Druillole) Design of new FPGA/CPU (Herve, Shebli, Louis) Design of data transmission (Jelle, Henk, Mar) New clock (?) New slow control (Michel) Network optimisation –copper/fibre (Louis, Henk, ?) –Ethernet switch (Louis) Both slow control & data acquisition (mjg)
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1-1 mixed: copper riser / fibre backbone Design of multi-functional FPGA system –FPGA/CPU integration (Herve, Shebli) –Slow control (Michel?) –Front end (Guilloux, Delagnes, Druillole) Integration of clock & data transmission system –Time synchronisation & calibration (Rethore, Herve, Henk) –Hardware/software (Nemo) Network optimisation (Jelle, Nemo?, ?)
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Photonics based Design of front-end electronics-photonics (Sander, Jelle, Mar) Optical network (Jelle, Mar) On-shore multi- laser Mar, Jean Jennen) Synchronised readout (mjg) On-shore smart TDC (Saclay, Hervé) No slow control (WP2) Per 16-04-2007 new partners show interest to participate after an upcoming dedicated meeting of WP4
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Review presentations WP4 parallel session 1.NEMO phase 1: Clock distribution 2.NEMO floor control Module 3.Progress on DAQ physical layer 4.Progress on optical components 5.Commercial Digitizing card
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Conclusions Nemo phase 1: clock distribution Currently working for 4 floors NEMO phase 2: clock distribution to 16 floors Setup can be easily adapted to serve a KM3NeT size apparatus
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Conclusions by the WP4 meeting participants 1.Weakness: lack of input from other WP’s 2.Dedicated WP4 meeting is wanted with inputs from other WP’s 3.Use today’s technology is required 4.Get together to: define a medium scale demonstrator roadmap to efficient decision making on technology
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General summary “All-data-to-shore” is shown to work –reduce off-shore electronics to minimum Communication with other WP’s important –separation of functionalities –front-end electronics Pursue different concepts – à la Antares – 1-1 mixed: copper riser / fibre backbone – photonics based
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