Dr
Domenico Lo Presti
(Catania University)
4/23/08, 8:30โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
A proposal for a new front-end architecture intended to capture signals in the optical module of an underwater neutrino telescope is described. It concentrates on the problem of high dynamic range, power consumption, signal reconstruction, charge and time precision. Preliminary test results on a demonstration board are shown.
Mr
George Bourlis
(Hellenic Open University)
4/23/08, 8:40โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The use of Time over Threshold (ToT) digitization techniques for the treatment of the output signal of the PMTs of the KM3NeT detector is under consideration by the KM3NeT collaboration. In this technique the leading and trailing edge of the signal above a certain threshold are time stamped and the corresponding times are sent to the onshore acquisition system. More information can be obtained...
Dr
Gabriele Giovanetti
(INFN)
4/23/08, 8:50โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
This work presents a new electronic board which will equip two experimental floors on the NEMO Phase-2 tower which will be deployed at Capo Passero. This board integrates the front-end electronics for PMT signal acquisition, the floor communication interfaces with environmental instruments, the interface with a hydrophone board and the high speed communication link with the tower backbone,...
Dr
Stefano Russo
(Universita` di Napoli Federico II)
4/23/08, 9:00โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The construction of a Km3 scale underwater telescope for high energy neutrinos is a fundamental task for the development of - high energy neutrino astronomy. The NEMO collaboration is involved in an intense activity to develop, apply and test technical solutions for a deep underwater laboratory devoted to study the high energy neutrino component of cosmic rays. In this framework the front-end...
Mr
Theodoros Athanasopoulos
(NOA / IAF Nestor)
4/23/08, 9:10โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
Usually the front end electronics required for a neutrino telescope, are electronics that perform waveform capture of analogue signals, optionally enforcement of a local triggering algorithm and transmission of the data to the shore. We show how a commodity system which employs COTS devices, like FADCs and FPGAs, can be used to perform such tasks to be used for multiple OMs' synchronous signal...
Anastasios BELIAS
(NOA/NESTOR)
4/23/08, 9:30โฏAM
The on-shore DAQ system for a km3 scale underwater Neutrino Telescope is required to read continuously the OMs (~10000) from the entire telescope and perform filtering and aggregation of the data to search for signatures of candidate muon and neutrino events. We propose the use of reconfigurable computing architecture to filter and route the continuous input data rates of about 1-10 Gb/s to...
Mr
Peter Healey
(CIP)
4/23/08, 9:45โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The purpose of this paper is to demonstrate that current optical communications technologies could be used to implement a real-time data transfer system for KM3NeT. We propose a solution based on Passive Optical Network principles (PONs) employing wavelength division multiplexing. A key feature of the design is that it does not employ remote light sources; instead a shore-based centralized...
Mr
Jelle Hogenbirk
(Nikhef)
4/23/08, 10:05โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
Today 100 optical specified ITU channels can fit into 1 single fiber. Today a 10Gb/sec. data rate per optical channel is common practice. This enables a transparent network with point to point connections from seabed to shore. Accurate timing, jitterless signal propagation, is intrinsic to an all optical system. Additional advantages of this node based passive optical approach are a long...
Mr
M.J. Van der Hoek
(Nikhef)
4/23/08, 10:20โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
Photonics, being a key technology in the present telecommunication networks already, will also strongly empower the realization of future very large volume neutrino telescopes. In general, photonics will serve as enabling technology in wide-area or large volume distributed networks for scientific research, connecting a large number of sensors to a central data collection centre. All-optical...
Peter Jansweijer, P.P.M.
(NIKHEF)
4/23/08, 10:45โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The described system transports data from the Optical Modules to the on-shore data acquisition system using copper twisted pairs for the short runs and fiber optics for long distance to the Shore Station. VDSL2, developed for 'video to the home', provides > 100 Mbit/s bandwidth over a single twisted copper pair in the vertical string to transport all the data from an Optical Module to the...
Dr
Fabrizio Ameli
(INFN Roma La Sapienza)
4/23/08, 11:00โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The experience gained in previous experiments suggests to explore new ways of realizing the data transmission at the level of the detection unit (i.e. the string or the tower). The implementation of a copper connection with simple tracts of cable between contiguous storeys could provide an easier scalability of the structure, simple maintenance of the backbone, lower costs because of cheaper...
Mr
Steven Thumbeck
(SEACON Advance products LLC)
4/23/08, 11:20โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
Over the past few years fibre optic connector technology has made significant advancements especially within the underwater matable field. This presentation list some of the enhancements and experiences gained.
Dr
Antonio D'Amico
(INFN-LNS)
4/23/08, 11:40โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The cable system layout for the NEMO Phase-2 project has been studied starting from the experience obtained after NEMO Phase-1 deployment. The aim has been to improve the reliability and simplify the integration procedures of the system. This has been attained by reducing the number of optical fibers in the backbone and by an improved layout of the optical links in the cabling. Moreover an...
Dr
Diego Torazza
(I.N.F.N. Genova)
4/23/08, 11:55โฏAM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
main talk chapters:
- short description of the wet mateable connectors concept and main features
- report about the activity of design, prototyping and tests made by INFN Genoa mechanical design department and internal shop
- Description of first prototype tests (currently ongoing)
- First preliminary test results
- Performed tasks
- Future activity
- possible industry collaborations
Dr
Davide Piombo
(Istituto NAzionale di Fisica Nucleare sez. Genova)
4/23/08, 12:05โฏPM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The NEWASTR project consists in the realization and deployment of an Antares mini string in the NEMOโs Capo Passero site together with the NEMO tower. This project has been proposed to make an on-site comparison between the two different layouts and to check how the bioluminescence phenomena can be affected by the detector geometry. In addition it will give a direct measurement of the...
Rosanna Cocimano
(INFN - LNS)
4/23/08, 12:15โฏPM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The NEMO Collaboration is involved in an intense activity to develop, apply and test technical solutions for an underwater laboratory with two prototypes called NEMO Phase 1 and NEMO Phase 2. In this framework both options of AC and DC power feeding systems have been explored. The design, realization, test and operation of NEMO Phase 1 AC electrical power and control system were carried out...
Dr
Miguel Ardid
(IGIC- Universitat Politรจcnica de Valรจncia)
4/23/08, 2:00โฏPM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The ANTARES neutrino telescope consists of 12 string lines containing the optical detectors. Sea water currents results on drifts for these strings of several meters from the vertical. However, muon track reconstruction is based on precise arrival of Cherenkov photons to the optical modules (~1 ns) and knowledge of the optical module position with respect to a fixed reference system with the...
O Kebkal
(Evologics GmbH, Berlin, Germany)
4/23/08, 2:15โฏPM
An acoustic echo-location system was applied for distant localization of the Baikal Neutrino Telescope string positions. The echo-location system was situated on the ice surface, while the telescope stayed in its standard arrangement between 1100 and 1200 m depth. "Large" reflectors, such as the end buoys located above the strings, served as reference marks. Acoustic localization of these...
Dr
Francesco Simeone
(Physics Department University "Sapienza" and INFN,Roma)
4/23/08, 2:30โฏPM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The acoustic positioning system is one of the key subsystems of an underwater neutrino telescope. Both in Antares and in NEMO-phase 1 the acoustic positioning system was based on โoff-the-shelfโ commercial technology. This technology is typically based on the use of acoustic beacons, displaced to form a Long Baseline (LBL) on the sea bed, and acoustic receivers (hydrophones) mounted on the...
Dr
Alain Maguer
(NURC - Nato Undersea Research Centre)
4/23/08, 2:45โฏPM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
NURC, the NATO Research Centre in La Spezia (ITALY) has been working for almost 50 years in the domain of underwater technology. This paper will describe NURC capability in the underwater acoustics technology and how this can be applied to the Neutrino telescope in Mediterranean Sea. Expertise will be described in deep water hydrophones design, acoustic and oceanographic calibration for deep...
Dr
Angelo Orlando
(INFN - LNS)
4/23/08, 3:00โฏPM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
The NEMO Collaboration is presently carrying out an intense activity on โNEMO Phase-2โ project for the realization of a 16 floor tower. In this paper the design of the electrical power control system and of a system for the monitoring of some engineering parameters, like depth, floor orientation and attitude and acceleration, are presented. The proposed architecture is strongly modular and...
Dr
Simona Toscano
(IFIC - Valencia)
4/23/08, 3:15โฏPM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
In this contribution we review the concepts put forward for the time calibration and positioning systems of the future KM3NeT neutrino telescope in the Mediterranean Sea. Even though the final layout of the detector, its mechanical structures and the light detection technologies to be used are not yet defined, much progress has been made in clarifying the possible technologies available for...
Dr
Marco Circella
(INFN Bari)
4/23/08, 3:30โฏPM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
This presentation will describe the time calibration system proposed for the NEMO (NEutrino Mediterranean Observatory) underwater neutrino telescope. The time calibration is a very critical task to perform in such a large apparatus, as its track reconstruction capabilities strongly depend on the accuracy of the time alignment of the measurements made by the different sensors. In the prototype...
Mr
Spyridon Koutsoukos
(NOA / Nestor)
4/23/08, 3:45โฏPM
Parallel Session on Engineering for deep deployment neutrino telescopes
Contributed talk
A critical review of the available calibration techniques will be given. We will discuss the effect of the optical properties of water on different candidate light sources and the difficulties from an engineering and electronics point of view. The merits of candidate light sources will be compared
