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Transcript of Disk WP-4 “Information Technology” J. Hogenbirk/M. de Jong Introduction (‘Antares biased’) ...
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WP-4 “Information Technology”
J. Hogenbirk/M. de Jong
Introduction (‘Antares biased’) Design considerations Recent developments Summary
“All-data-to-shore”
photondetection
informationtransmission information
management
informationdistribution
detector
f m
f 1
ff
m+1
m minimum number of
time-position correlated photons
“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
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
+ L0● L1
shower
Cherenkovcone
muon
neutrino
location of GRB
detector
All data before, during and after
GRB
alert
save
analysis
Gamma-Ray Burst
All data
TCP/IP
TCP/IP
GRB time – earliest recorded raw data
delay [s]
num
ber
of g
am
ma
-ra
y b
urs
ts
Access to data before GRB delayed messages
Design considerations
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
Separation of functionalities
Optimise implementation Reduce cost Parallel design/production * Reliability versus redundancy
Detection Units Instrumentation Units
requires proof of concept for calibration
*Critical path relaxation
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 purityphoton is digital!
Probability to detect 2 (or more) photons
as a function of
photo-cathode area distance between muon and PMT
wavefront
Cherenkov light cone
0
/ sin
( )2
cabsReR I
R
~1 km
1-2 abs
R [m]
P(#
≥
2)
– 0.01 m2
– 0.02 m2
– 0.03 m2
– 0.04 m2
– 0.05 m2
Probability to detect 2 (or more) photons
QE = 25%photo-cathode area:
2 x larger PMT does NOT see twice as far
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
Time slice(or “how-to-get-all-data-in-one-
place”)
/T L n c
time muon takes to traverse detector
~
Trigger Trigger Trigger
time
Ethernet switch
off-shore
on shore
Trigger Trigger Trigger
time
Ethernet switch
off-shore
on shore
Trigger Trigger Trigger
time
Ethernet switch
off-shore
on shore
Design concepts
à la Antares 1-1 mixed: copper riser / fibre backbone photonics based
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)
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?, ?)
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
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
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
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
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