# VLVnT11 - Very Large Volume Neutrino Telescope Workshop (2011)

12-14 October 2011
Physics Lecture Hall
Europe/Berlin timezone
Refereeing process of the proceedings has started.
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Displaying 90 contributions out of 90
Session: Parallel Session 7
Track: Computing and data
The framework for the KM3NeT shore system is based on the Internet Communications Engine, ICE. The task of the system includes control, data acquisition and processing, pre-selection of events for storage and further processing and on-line monitoring of the KM3NeT neutrino telescope. We describe the overall shore DAQ system and discuss in particular the processing, storing and monitoring tasks. We ... More
Presented by Dr. Antonis PAPAIKONOMOU on 12 Oct 2011 at 17:50
Session: Parallel Session 1
Track: Physics, reconstruction and software
In high energy neutrino telescopes, the detection principle relies on the detection of Cherenkov light emitted from an up-going muon induced by νμ that have penetrated the Earth. At the muon energy range of interest in astrophysical search (namely from about 100 GeV to about 1 PeV), the electromagnetic showers accompanying the muon track generate Cherenkov light emitted within a few degrees of ... More
Presented by Dr. Gianfranca DE ROSA on 13 Oct 2011 at 11:30
Session: Parallel Session 4
The optical modules of the future KM3NeT neutrino telescope will contain many photomultiplier tubes with a diameter of about three inch. In order to characterize these photomultiplier tubes, a 16 channel Time-Over-Threshold TDC with a GigaBit Ethernet communication channel has been built in an Altera StratixIV evaluation board. The TDC data are packed in UDP packages and sent to the host PC. Cont ... More
Presented by Gerard KIEFT on 12 Oct 2011 at 18:30
Session: Parallel Session 1
Track: Physics, reconstruction and software
We investigate the potential of a Very Large Volume Underwater Neutrino Telescope to observe Super Nova explosions within our Galaxy. The intense neutrino burst emitted in a SN explosion results in a large number of MeV neutrinos in the vicinity of the Neutrino Telescope which can be detected (mainly) via the reaction $\bar{\nu}_e +p \rightarrow e^{+}+n$. For the simulation study we have used the ... More
Presented by Dr. Anthony LEISOS on 12 Oct 2011 at 15:00
Session: Parallel Session 4
Photosensitive devices represent a key solution for several current and future categories of experiments in which light detection can be considered the main observation channel for physical phenomena. Astro-particle experiments for instance, one of the most promising observation channels for passive High Energy Physics, typically study energetic phenomena in which charged particles originating f ... More
Presented by Carlos Maximiliano MOLLO on 12 Oct 2011 at 19:10
Session: Parallel Session 2
Track: Mechanics, deployment and vessels
KM3NeT is a future deep-sea research facility that will be built at depths between three and five kilometres in the Mediterranean Sea. The facility will host a neutrino telescope consisting of several hundreds of detection units - vertical mechanical structures that suspend the optical sensor modules of the telescope. During the design phase of the KM3NeT telescope, two mechanical designs for the ... More
Presented by Els DE WOLF on 13 Oct 2011 at 11:05
Session: Parallel Session 2
Track: Mechanics, deployment and vessels
The future KM3NeT neutrino telescope will be built on the seabed of the Mediterranean Sea at a depth between three and five kilometers. The high ambient pressure, but also the fact that the detector is hardly accessible, put severe constraints on the mechanical design of the detection units of the telescope. A detection unit is a vertical structure which supports the optical sensors of the telesco ... More
Presented by Edward BERBEE on 13 Oct 2011 at 10:45
Session: Parallel Session 1
Track: Physics, reconstruction and software
Gamma ray earthbound & satellite experiments have observed over the last years many Galactic and extragalactic gamma ray sources. The detection of astrophysical neutrinos emitted by the same sources would imply that these astrophysical objects are charged cosmic ray accelerators and help to resolve the enigma of the origin of cosmic rays. A very large volume neutrino telescope will be able to dete ... More
Presented by Dr. Apostolos TSIRIGOTIS on 13 Oct 2011 at 11:50
Session: Parallel Session 5
Track: Deep-sea and deep-ice technologies
KM3NeT is a research facility which will be built at the bottom of the Mediterranean Sea. The facility will host a neutrino telescope with several hundreds of detection units - vertical mechanical structures to which the optical sensors modules of the telescope are attached. A data cable will run the full length of the structure, which is almost one kilometre. In order to allow a novel compact dep ... More
Presented by Gertjan MUL on 12 Oct 2011 at 15:15
Session: Plenary Session
Track: Plenary Session
Presented by Luke DRURY on 13 Oct 2011 at 14:50
Session: Parallel Session 3
Track: Calibration
The design of the KM3NeT neutrino telescope is based on flexible structures - the detection units. The highly dynamic environment in the deep sea necessitates a continuous monitoring of their exact position. A common way to perform this is the use of acoustic emitters and receivers based on the piezoelectric effect. The receivers are attached to detection units whereas the emitters are located at ... More
Presented by Alexander ENZENHöFER on 12 Oct 2011 at 15:05
Session: Parallel Session 4
An accurate study and measurement on the ageing effects on two large area photomultipliers has been performed for over three years. The photomultipliers were 10”, 10 stages Hamamatsu R7081one with standard bialkali and the other one with super-bialkali photocathode. Gain, dark count rate, charge and timing properties have been measured, as well as the fraction of the spurious pulses. During th ... More
Presented by Dr. Emanuele LEONORA on 12 Oct 2011 at 17:10
Session: Parallel Session 1
Track: Physics, reconstruction and software
The main background to the search for astrophysical neutrino sources with large volume telescopes is due to the muon component of extensive air showers produced in the interaction of high-energy cosmic rays with the Earth’s atmosphere. This background, however a nuisance for neutrino-event searches, can be used to explore certain aspects of cosmic ray physics. The high rate of muon events in lar ... More
Presented by Marcos SANTANDER on 12 Oct 2011 at 14:00
Session: Parallel Session 5
Track: Deep-sea and deep-ice technologies
The NEMO collaboration has undertaken a Phase-2 project, which aims at the realization and installation of a new infrastructure at the deep-sea site of Capo Passero at 3500 m depth. To this aim, a fully equipped 8-storey tower hosting two Optical Modules (OMs) at each end (four OMs per storey) is under construction. Following a well established procedure, the assembly of the 32 OMs is under compl ... More
Presented by Dr. Emanuele LEONORA on 12 Oct 2011 at 15:40
Session: Plenary Session
Presented by Dr. Tyce DEYOUNG on 13 Oct 2011 at 16:20
Session: Parallel Session 3
Track: Calibration
The ANTARES neutrino telescope is a photo-detector array consisting of 12 flexible strings holding 885 photomultiplier tubes which collect the Cherenkov light emitted by the charged leptons produced in the interaction of high energy neutrinos with the matter in or surrounding the detector. The trajectories of the resulting muons can be reconstructed using the time, position and charge informatio ... More
Presented by Juan Pablo GóMEZ GONZáLEZ on 12 Oct 2011 at 14:00
Session: Parallel Session 3
Track: Calibration
ANTARES is a neutrino detector based on a three dimensional grid of photomultipliers tubes (PMTs) arranged in several detection lines anchored to the seabed at 2.5 km of deep into the Mediterranean Sea (40 km o of the Toulon coast in France), being its main goal the reconstruction and identi cation of high energy neutrinos from extra-terrestrial origin. The PMTs collect the Cherenkov light induce ... More
Presented by Harold YEPES RAMIREZ on 12 Oct 2011 at 14:25
Session: Parallel Session 1
Track: Physics, reconstruction and software
A multimessenger approach with gravitational waves (GW) and high-energy neutrinos (HEN) is expected to open new perspectives in the study of the most violent astrophysical processes in the Universe. Several experiments (e.g. ANTARES, IceCube, LIGO and VIRGO) are currently recording data and searching for astrophysical sources. A working group gathering physicists from those experiments has been fo ... More
Presented by boutayeb BOUHOU on 12 Oct 2011 at 14:40
Session: Parallel Session 1
Track: Physics, reconstruction and software
A short overview of the MC simulation tools used in the ANTARES and IceCube experiments is given. The differences in the general approaches used by the 2 groups due to the characteristic features of the medium where the detectors collect data are stressed and discussed. Limitations of the present tools are reviewed and on-going developments of new software and techniques are presented.
Presented by Annarita MARGIOTTA on 13 Oct 2011 at 10:00
Session: Parallel Session 1
Track: Physics, reconstruction and software
Cosmogenic neutrinos are produced during the propagation of ultra high energy cosmic rays (UHECR) through the cosmological microwave background radiation. Extragalactic origin of UHECR guarantees generation of the high energy cosmogenic neutrinos, however the flux depends on the currently unknown properties of UHECR, for example the chemical composition and distribution of the sources. Estimat ... More
Presented by Rezo SHANIDZE on 12 Oct 2011 at 15:40
Session: Plenary Session
Track: Plenary Session
Since 2006, the development of a km3-scale neutrino telescope - the Gigaton Volume Detector (GVD) in Lake Baikal - is the central goal of the Baikal collaboration. A prototype cluster of GVD was installed in Lake Baikal in April 2011. The cluster consists of 24 optical modules located on three strings. We present selected results obtained in the course of developing and testing key elements and s ... More
Presented by Dr. Vladimir AYNUTDINOV on 14 Oct 2011 at 11:30
Session: Parallel Session 7
Track: Computing and data
The Auger Engineering Radio Array (AERA) is currently detecting cosmic rays of energies at and above 10^17 eV at the Pierre Auger Observatory, by triggering on the radio emission produced in the associated air showers. Unlike other air shower detection methods, the radio-detection technique must cope with a significant background of man-made radio-frequency interference, but can provide informat ... More
Presented by Dr. John KELLEY on 12 Oct 2011 at 17:10
Session: Parallel Session 4
We describe a novel optical solution for data readout systems, developed within the framework of the FP7 NMP project EuroPIC (europic.jeppix.eu). In this project photonic ICs in the Indium-Phosphide-based material system are designed and fabricated. This enables the monolithic integration of active (amplifiers, photodetectors) with modulators and passive components (waveguides, splitters, filters) ... More
Presented by Mr. Stanislaw STOPINSKI on 13 Oct 2011 at 11:40
Session: Parallel Session 3
Track: Calibration
With the aim to optimize and test the acoustic detection of ultra-high energy neutrinos in underwater telescopes, we have developed a compact acoustic transmitter array able to reproduce the acoustic signature of UHE neutrino based on the parametric acoustic sources effect. We present different R&D studies to show the viability of the parametric sources technique to deal with the difficulties of g ... More
Presented by Ms. Silvia ADRIáN on 12 Oct 2011 at 15:45
Session: Parallel Session 3
Track: Calibration
In this paper we describe the acoustic transceiver developed for the KM3NeT positioning system. The acoustic transceiver is composed of a commercial free flooded transducer, which works mainly on the 20-40 kHz region and withstands high pressures (up to 500 bars). A developed sound emission board, which has been designed to be adapted to the specific transducer and fulfill all the requirements: lo ... More
Presented by Ms. Giuseppina LAROSA on 12 Oct 2011 at 15:25
Presented by Yuji HOTTA
Session: Parallel Session 4
A KM3Net detection node consists of a multi-PMT Digital Optical Module(DOM) containing 31 photomultipliers (PMTs) and the associated electronic for power, readout and control. The components of the DOM electronic will be reviewed, namely a System-on-chip in charge of the data acquisition and slow control, a power board converter, various instrumentation devices and a Gigabit Ethernet link over a ... More
Presented by frederic LOUIS on 13 Oct 2011 at 12:20
Session: Parallel Session 1
Track: Physics, reconstruction and software
We report on the development of search methods for point like and extended neutrino sources taking into account the resolution of an underwater Mediterranean neutrino telescope to reconstruct the direction as well as the energy of the detected muon tracks, on a track by track basis. We present results on the potential of a very large volume neutrino telescope to discover neutrino sources. The deve ... More
Presented by Prof. Spyros TZAMARIAS on 13 Oct 2011 at 12:10
Session: Parallel Session 1
Track: Physics, reconstruction and software
The future neutrino telescope KM3NeT, to be built in the Mediterranean Sea, will be the largest Cherenkov detector and will include several hundred thousands photomultiplier tubes (PMT). In the deep sea the dominant source of PMT signals are decays of K40 and marine fauna bioluminescence. Selection of neutrino and muon events from this continuous optical background signals requires the implementat ... More
Presented by Mr. Thomas SEITZ on 12 Oct 2011 at 17:10
Session: Parallel Session 4
The KM3NeT readout concept is based on a point-to-point optical network connecting the ten thousand optical modules in the deep-sea neutrino telescope with the shore station. The numerous fibre optic channels arriving at the shore station will be concentrated on the shore electronics systems, which will receive, merge and time order the data, and send them to the DAQ system. Although the network ... More
Presented by Dr. Kostas MANOLOPOULOS on 13 Oct 2011 at 11:00
Session: Plenary Session
Track: Plenary Session
ASPERA is the network of European funding agencies in the field of astroparticle physics. In my presentation I will report on the status of the implementation of the European roadmap for astroparticle physics and the network's supporting activities in view of the realization of coming large projects including a large underwater neutrino telescope in the Mediterranean.
Presented by Dr. Thomas BERGHOEFER on 14 Oct 2011 at 15:30
Session: Parallel Session 7
Track: Computing and data
Bachir BOUHADEF, INFN Pisa & Physics department of Pisa, On behalf of NEMO Collaboration. Graphics Processing Units are high performance co-processors originally intended to improve the use and quality of computer graphics applications. Because of their potential, researchers have extended their use beyond the computer graphics scope. The main goal of this work is to evaluate the time benefit o ... More
Presented by Dr. Bachir BOUHADEF on 12 Oct 2011 at 18:30
Session: Plenary Session
Presented by Uli KATZ on 13 Oct 2011 at 17:00
Session: Plenary Session
Presented by Paolo PIATTELLI on 13 Oct 2011 at 16:45
Session: Plenary Session
Track: Plenary Session
The construction of IceCube neutrino telescope and IceTop surface array was successfully completed at the South Pole during December, 2010. IceCube is the most sensitive telescope to date for observing high energy neutrino sources. The performance of the IceCube detector and a selection of results will be reported from earlier years as the detector increased in size from 40, 59 and 79 strings. ... More
Presented by Elisa RESCONI on 12 Oct 2011 at 10:30
Session: Parallel Session 1
Track: Physics, reconstruction and software
The ANTARES Collaboration is now operating the largest water Cherenkov neutrino telescope in the Nothern hemisphere. The apparatus, completed in 2008, comprises 12 detection lines and a multidisciplinary instrumentation line installed at a depth of about 2500 m in the Mediterranean Sea offshore from France. The goals of ANTARES are among others the search for astrophysical neutrino point source ... More
Presented by Juan De Dios ZORNOZA GOMEZ on 12 Oct 2011 at 15:20
Session: Parallel Session 1
Track: Physics, reconstruction and software
The composition of cosmic rays in the range relevant for large-volume neutrino detectors constitutes a significant systematic uncertainty. An overview of available data from other experiments will be given, and the potential for independent measurements with a cubic-kilometer scale detector outlined.
Presented by Patrick BERGHAUS on 12 Oct 2011 at 14:20
Session: Plenary Session
Presented by Uli KATZ on 13 Oct 2011 at 16:10
Session: Plenary Session
Track: Plenary Session
The talk will show the present technical status of the KM3NeT telescope. The optimisation studies for detection of Galactic super nova remnant sources will be presented and the present sensitivity to such sources will be reviewed. Implications of the design on other science subjects will be shown. Possible scenarios for the realisation of the telescope in the near future will be given.
Presented by Paul Martin KOOIJMAN on 14 Oct 2011 at 10:00
Session: Parallel Session 5
Track: Deep-sea and deep-ice technologies
KM3NeT is a future deep-sea research infrastructure hosting a neutrino telescope with a volume of more than one cubic kilometre to be constructed in the Mediterranean Sea. In the context of the Preparatory Phase of KM3NeT, funded by the EU FP7 framework, the engineering design of the deep-sea telescope has been carried out and optimized to prepare rapid and efficient construction. This paper prese ... More
Presented by Rosanna COCIMANO on 12 Oct 2011 at 14:00
Session: Parallel Session 1
Track: Physics, reconstruction and software
The KM3NeT consortium http://www.km3net.org aims at the construction of a cubic-kilometre-scale neutrino telescope for the Northern hemisphere with an integrated platform for earth and deep sea sciences. The telescope location in the Mediterranean Sea will allow for surveying a large part of the Galactic Plane (87%), including the Galactic Centre, thus complementing the sky coverage of IceCube a ... More
Presented by Dr. piera SAPIENZA on 12 Oct 2011 at 17:30
Session: Parallel Session 4
Presented by Yuji HOTTA on 13 Oct 2011 at 10:40
Session: Parallel Session 2
Track: Mechanics, deployment and vessels
ANTARES is the first neutrino telescope ever built in deep sea. The apparatus is equipped with 885 Optical Modules arranged on 12 detection lines. The construction of the apparatus was completed in 2008. The Collaboration then launched a two-year maintenance campaign, during which three lines were recovered and reinstalled, after curing some initial functionality problems. This activity has been q ... More
Presented by Marco CIRCELLA on 13 Oct 2011 at 10:05
Session: Parallel Session 1
Track: Physics, reconstruction and software
The data taken with ANTARES from 2007 to 2010 with a total lifetime of 830 days have been analysed in view of a possible neutrino oscillation signal. The flux of vertical upward going muon neutrinos should be completely suppressed at energies of 24 GeV due to neutrino oscillations. A dedicated algorithm is used, which allows the reliable reconstruction of muon tracks with energies as low as 20 Ge ... More
Presented by Juergen BRUNNER on 12 Oct 2011 at 15:00
Session: Parallel Session 2
Track: Mechanics, deployment and vessels
The NEMO Collaboration, which is part of the KM3NeT consortium, is pursuing a wide prototyping campaign (NEMO Phase 2) off the coast of Sicily. A summary of the mechanical developments performed in this project will be presented.
Presented by Giorgio CACOPARDO on 13 Oct 2011 at 10:25
Session: Parallel Session 2
Track: Mechanics, deployment and vessels
The KM3NeT Consortium, aiming to design and prepare the deployment of a deep sea detector for high energy neutrino astronomy, is developing a Pre-Production Model of the Detection Unit (PPM-DU) of the future telescope. A description of the mechanical structure of the PPM-DU, of the R&D activity that have brought to it and of the ongoing qualification process will be presented.
Presented by Mario MUSUMECI on 13 Oct 2011 at 11:45
Session: Parallel Session 1
Track: Physics, reconstruction and software
The energy of muon neutrinos and muons detected by IceCube is not directly measured. For low energy contained events the length of the track inside can be used to derive an energy estimate. For higher energy through-going events the main energy-related observable is the energy *loss* of muons. The stochastic nature of this energy loss makes the reconstruction non-trivial. Several approaches have b ... More
Presented by David BOERSMA on 12 Oct 2011 at 14:20
Session: Parallel Session 1
Track: Physics, reconstruction and software
The energy reconstruction of both neutrino induced muons from neutrino interactions in the vicinity of the detector and of muons from cosmic ray air showers contributes indispensable information for a broad range of physics analyses, e.g. by increasing the sensitivity in neutrino point source searches or by offering access to observables such as the atmospheric neutrino spectrum. Currently four en ... More
Presented by Jutta SCHNABEL on 12 Oct 2011 at 14:00
Session: Parallel Session 3
Track: Calibration
Within the activities of the NEMO project, the installation of a demonstrator 8-floors tower (NEMO-Phase II) at a depth of 3500m is foreseen in the next months. On board the NEMO tower, an array of 18 acoustic sensors will be installed permitting acoustic positioning of the tower (detecting acoustic signals emitted by a long baseline of five acoustic beacons anchored on the sea-floor), acoustic d ... More
Presented by Salvatore VIOLA on 12 Oct 2011 at 14:45
Session: Parallel Session 2
Track: Mechanics, deployment and vessels
Presented by Dr. Frank EGLOFF on 13 Oct 2011 at 12:05
Session: Plenary Session
Track: Plenary Session
Arrays of acoustic receivers are an integral part of present and potential future Cherenkov neutrino telescopes in the deep sea. They are required to monitor the positions of the optical detection modules whose positions vary with time as an effect of undersea currents. At the same time, the acoustic receivers can be employed for marine science purposes, in particular for monitoring the ambient no ... More
Presented by Robert LAHMANN on 14 Oct 2011 at 14:30
Session: Parallel Session 1
Track: Physics, reconstruction and software
The ANTARES neutrino telescope operating in the Mediterranean Sea aims to measure the cosmic neutrino flux and locate point sources in the multi-TeV energy range. Primarily this is achieved by detecting up-going muon tracks caused by charged-current interactions of neutrinos having passed through the Earth. Neutrino-induced showers, initiated by neutral-current interactions, extend the sensitivity ... More
Presented by Qader DOROSTI on 13 Oct 2011 at 10:50
Session: Plenary Session
Track: Plenary Session
In this contribution we will present the Extreme Universe Space Observatory onboard the Japanese Experiment Module of the ISS. After briefing summarize the scientific case of the mission, we will discuss the technological aspects and the expected performance of the mission. We will then focus on the capability of JEM-EUSO in detecting neutrinos at Ultra High Energy and on the potential science out ... More
Presented by Andrea SANTANGELO on 14 Oct 2011 at 12:00
Session: Plenary Session
Track: Plenary Session
The main features and performances of the Antares and Baikal neutrino telescopes are reviewed. The results obtained by these detectors in several studies, such as the search for neutrino point sources and diffuse fluxes, the search for neutrinos in coincidence with optical, high-energy gamma and gravitational wave signals, as well as the indirect search for dark matter and a short summary of other ... More
Presented by Juan HERNANDEZ-REY on 12 Oct 2011 at 11:20
Session: Parallel Session 7
Track: Computing and data
The data acquisition infrastructure of the KM3NeT deep-sea neutrino telescope in the Mediterranean will be a massively distributed system. The control and configuration application will be distributed over some 2000 offshore embedded nodes and hundreds of onshore processes. The full run conditions and detector state will have to be reliably set up and traced for a valid scientific analysis of the ... More
Presented by Dr. Shebli ANVAR on 12 Oct 2011 at 17:30
Session: Parallel Session 4
The comparison of the simulated to the real data in the Antares experiment is very important to understand the detector behavior. The observed differences in the charge distribution of the background hits, in the K40 coincidence rate in two adjacent optical modules and in the hit residual time distribution have been investigated both by a more detailed description of the PMT and by a dedicated ... More
Presented by Dr. Oleg KALEKIN on 12 Oct 2011 at 16:30
Session: Plenary Session
on 13 Oct 2011 at 17:15
Session: Parallel Session 2
Track: Mechanics, deployment and vessels
Presented by Prof. Efstratios ANASSONTZIS, Marco CIRCELLA on 13 Oct 2011 at 10:00
Session: Parallel Session 4
KM3NeT, the future deep-sea neutrino telescope of multi-cubic km size, is being designed to search for high energy neutrinos originating from galactic and extragalactic sources. The neutrinos can be detected by collecting Cherenkov light emitted from relativistic charged secondary particles caused by the interaction of neutrinos with the medium surrounding the detector. To collect the Cherenkov li ... More
Presented by Qader DOROSTI on 12 Oct 2011 at 17:50
Session: Parallel Session 4
ET Enterprises Limited started in May 2007 and took over the photomultiplier tubes and accessories business of Electron Tubes Limited and will continue to manufacture, supply and develop the Electron Tubes brand product range. ET Enterprises is located in Uxbridge, which is about 30km west of London. A subsidiary of Ludlum Measurements Inc., ET Enterprises Limited benefits from the additional p ... More
Presented by Andy CORMACK on 12 Oct 2011 at 18:10
Session: Parallel Session 7
Track: Computing and data
GPUs (graphics processing units) have become increasingly popular in the recent years for scientific calculations involving large numbers of similar steps. Photon propagation is a necessary part of simulating detector response to passing charged particles in IceCube that is an ideal application for use with GPUs. We discuss the principle ideas and practical issues of running such an application wi ... More
Presented by Dmitry CHIRKIN on 12 Oct 2011 at 18:10
Session: Parallel Session 4
The design of the readout and data acquisition system of the future KM3NeT neutrino telescope employs 10Gbps photonic technologies for data transmission to shore. The photonic architecture can handle standard transmission protocols. The generic scheme is based on DWDM technology using lasers on shore and optical modulators in each of the 15.000 Digital Optical Modules (DOMs) arranged on vertical d ... More
Presented by Jelle HOGENBIRK on 13 Oct 2011 at 11:20
Session: Plenary Session
Track: Plenary Session
Presented by Maarten DE JONG on 14 Oct 2011 at 16:30
Session: Parallel Session 1
Track: Physics, reconstruction and software
A wide range of analyses are pursued by IceCube in the search for astrophysical sources of neutrinos. These include time-integrated searches for steady sources, time-dependent searches correlated with AGN and other flares, and searches dedicated to GRBs as well as generic all-sky burst searches. In addition, an online system is now in place that sends neutrino-triggered alerts to optical, x-ray, ... More
Session: Parallel Session 2
Track: Mechanics, deployment and vessels
Within the KM3NeT project a quality management system was proposed that included a qualification process and a data base to store information on the design. This paper highlights quality control procedures applicable to KM3NeT and describes the data base.
Presented by Calogero SOLLIMA on 13 Oct 2011 at 11:25
Session: Parallel Session 4
A valuable functionality in many distributed, very large volume sensor network applications is the requirement to characterize and analyze the data traffic at wire speed. We discuss the benefits of a reconfigurable hardware router for real-time data processing and monitoring from sensors before the transmission to the network, based on the NetFPGA platform. We report on our study of a hardware imp ... More
Presented by Mr. Vasileios KOUTSOUMPOS on 13 Oct 2011 at 10:00
Session: Parallel Session 1
Track: Physics, reconstruction and software
An instrument like IceCube searches for neutrinos by recording and interpreting the Cherenkov light of charged particles that traverse the instrumented volume. From the photon intensity and arrival times at different locations in the detector one has to discern the nature of the event, separate neutrino candidates from the atmospheric muon background, and derive relevant properties like the deposi ... More
Presented by Eike MIDDELL on 13 Oct 2011 at 11:10
Session: Parallel Session 1
Track: Physics, reconstruction and software
We report on the evaluation of the performance of a Mediterranean very large volume neutrino telescope. We present results of our studies concerning the capability of the telescope in detecting/discovering galactic (steady point sources) and extragalactic, transient (Gamma Ray Bursts) high energy neutrino sources as well as measuring ultra high energy diffuse neutrino fluxes. The neutrino effectiv ... More
Presented by Dr. Apostolos TSIRIGOTIS on 12 Oct 2011 at 17:50
Session: Plenary Session
Track: Plenary Session
This talk will summarize the recommendations of the ASPERA roadmap, with a focus to high energy neutrinos. It will also relate the ASPERA strategy on neutrino projects to strategy discussions in other parts of the world.
Presented by Christian SPIERING on 14 Oct 2011 at 15:00
Session: Parallel Session 4
The observation of high energy neutrinos produced in astrophysical phenomena would open a new window on the Universe. The very low neutrino cross section requires instrumented volumes at the cubic-kilometre scale. The European KM3NeT consortium is now in a preparatory phase towards the construction of such a large neutrino telescope in the Mediterranean Sea. Physics studies have shown that the Che ... More
Presented by Sophie Catherine FERRY, Sophie FERRY on 13 Oct 2011 at 10:20
Session: Parallel Session 1
Track: Physics, reconstruction and software
The Pierre Auger Observatory is sensitive to extended air-showers induced by ultra-high-energy neutrinos of all flavors as they interact with the atmosphere and inside the earth. These air-showers display characteristic features that allow their identification. We report on recent searches for ultra-high-energy neutrinos at the Pierre Auger Observatory. We present the different identification crit ... More
Presented by Javier GONZALEZ on 12 Oct 2011 at 15:20
Session: Parallel Session 1
Track: Physics, reconstruction and software
The ANTARES neutrino telescope was installed in the Mediterranean Sea in several stages, and was completed in 2008. It comprises a three-dimensional array of 885 Optical Modules distributed on 12 vertical lines, anchored at a depth of 2475 m. While designed to observe upgoing neutrinos, ANTARES could also be sensitive to the bright signal of relativistic magnetic monopoles and slow nuclearites. ... More
Presented by Ms. Gabriela Emilia PAVALAS on 12 Oct 2011 at 15:40
Session: Parallel Session 1
Track: Physics, reconstruction and software
The ANTARES telescope observes a full hemisphere of the sky all the time with a duty cycle close to 100%. This makes it well suited for an extensive observation of the neutrinos that can be produced in astrophysical transient sources. In the surrounding medium of the blazars, i.e. active galactic nuclei with their jets pointing almost directly through the observer, neutrinos may be produced toget ... More
Presented by Agustín SáNCHEZ LOSA on 12 Oct 2011 at 14:40
Session: Parallel Session 1
Track: Physics, reconstruction and software
Acoustic neutrino detection is a promising approach for large-scale ultra high energy neutrino detectors in water. The presented simulation chain is designed within the SeaTray/IceTray software framework. Its modular architecture is highly flexible and makes it easy to adapt to different detector geometries, environmental conditions or hardware used. The simulation chain covers the generation of t ... More
Presented by Max NEFF on 13 Oct 2011 at 10:30
Session: Parallel Session 5
Track: Deep-sea and deep-ice technologies
Connectors for underwater use are an important component of many subsea systems, they make it easier to conduct onshore or offshore testing, easier to manage cabled assemblies and facilitate ease of installation during deployment. Underwater connectors come in a variety of types and configurations, a majority of the underwater connectors are either dry-mate or wet-mate having electrical or optica ... More
Presented by Steven THUMBECK on 12 Oct 2011 at 14:50
Session: Parallel Session 4
Three companies are developing new types of 3 inch photomultiplier tubes (PMTs) for the KM3NeT project. The first PMT samples have been delivered from Hamamatsu (R6233mod type) and ET Enterprises (D783KFLA type) and tested. The results of these tests are presented. PMTs of these two types have been ordered to build the the first KM3NeT developmental optical modules. MELZ have produced new 82mm-dia ... More
Presented by Mr. Lew CLASSEN on 12 Oct 2011 at 17:30
Session: Parallel Session 4
The influence of the Earth’s magnetic field on candidate large PMTs for a cubic-kilometer-scale neutrino telescope was studied within the framework of the KM3NeT design study. In particular, this study was aimed at deciding whether the use of a magnetic shield could be avoided, thereby reducing cost and simplifying optical sensor module assembly. Measurements were performed for three Hamamatsu ... More
Presented by Dr. Emanuele LEONORA on 12 Oct 2011 at 16:50
Session: Parallel Session 7
Track: Computing and data
Completed in 2008, ANTARES is now the largest water Cherenkov neutrino telescope in the Northern Hemisphere. Its main goal is to detect neutrinos from galactic and extra-galactic sources. Due to the high background rate of atmospheric muons and the high level of bioluminescence, several online and offline filtering algorithms have to be applied to the raw data taken by the instrument. To be able ... More
Presented by Dr. Claudio KOPPER on 12 Oct 2011 at 16:30
Session: Plenary Session
Track: Plenary Session
The ARA collaboration is developing an array of radiofrequency antennas covering approx. 150 sq-km surface which will be installed in boreholes extending 200 m below the ice surface at the geographic South Pole. The antennas are senstitive to the weak, transient impulses given off by exteremely high energy neutrino-induced cascades. The array geometry has been chosen to ensure the detection of th ... More
Presented by Kael HANSON on 14 Oct 2011 at 14:00
Session: Parallel Session 1
Track: Physics, reconstruction and software
A recent analysis of the Fermi data [1] provides evidence of the emission of high energy gamma rays (up to 100 GeV) with a high intensity E-2 spectrum. This emission was detected as originating from two large areas around the Galactic center, spanning 50° above and below the Galactic center and 40° in longitude, with no spacial evidence of variation both in the spectrum shape and in the intensit ... More
Presented by Dr. Rosa CONIGLIONE on 12 Oct 2011 at 18:10
Session: Parallel Session 5
Track: Deep-sea and deep-ice technologies
Located next to the existing ANTARES neutrino telescope site, operational since 2008 offshore of Toulon at a depth of 2500m, MEUST (Mediterranean Eurocentre for Underwater Sciences and Technologies) will be a second generation submarine cabled infrastructure developed within the European projects KM3NeT and EMSO. This new cabled facility will share its high-capacity with neutrino astronomers and ... More
Presented by Dr. Claude VALLEE on 12 Oct 2011 at 14:25
Session: Parallel Session 7
Track: Computing and data
The phase 2 of the NEMO project represents a unique occasion to test a new Trigger and Data Acquisition System (TriDAS), designed to scale up to the km3. Because of the deep sea optical background, the NEMO "all data to shore" approach requires to handle a large continuous data-stream from off-shore to on-shore, up to the last on-line computing element. The computing layers of TriDAS sta ... More
Presented by Tommaso CHIARUSI on 12 Oct 2011 at 16:50
Session: Plenary Session
Track: Plenary Session
Neutrino astronomy opens a new window for the observation and study of high-energy phenomena in our Universe. The emission of high energy neutrinos is intimately related to that of gamma rays and cosmic rays (CRs) via hadronic interactions in extragalactic sources or the cosmic environment. I will discuss our present expectations for the cosmogenic neutrino flux associated with the propagation of ... More
Presented by Markus AHLERS on 13 Oct 2011 at 14:00
Session: Parallel Session 1
Track: Physics, reconstruction and software
Results of a time-integrated search for astrophysical high energy neutrinos are presented using data collected from January 2007 to December 2010 with the ANTARES neutrino telescope. ANTARES is currently the largest neutrino detector on the Northern Hemisphere consisting of a tri-dimensional array of 885 photomultipliers arranged on 12 vertical lines, placed at a depth of 2475 meters in the Medite ... More
Presented by Mr. Claudio BOGAZZI on 12 Oct 2011 at 16:30
Session: Plenary Session
Track: Plenary Session
DeepCore, the fully contained low energy extension to IceCube, extends IceCube's sensitivity for indirect dark matter searches and atmospheric neutrino oscillations. With the first year of DeepCore data we observe a significant sample of atmospheric neutrino-induced cascades, confirming the scientific potential of this approach. We will discuss ideas for PINGU, a further IceCube infill array whi ... More
Presented by Tyce DEYOUNG on 14 Oct 2011 at 11:00
Session: Plenary Session
Track: Plenary Session
We expect an observable flux of neutrinos in the ultra-high energy (UHE) regime (above 10^18 eV) from the interactions of the highest energy cosmic rays with cosmic microwave background photons. I will review the latest constraints set by neutrino telescopes which are closing in on this UHE neutrino flux. The next generation of UHE neutrino experiments are aiming for detection volumes of order 100 ... More
Presented by Amy CONNOLLY on 12 Oct 2011 at 11:55
Session: Parallel Session 4