NESTOR - Latest News 

Visit of his Excellency Dr. K. Papoulias President of the Hellenic Republic

September 8, 2008 

APRIL 26, 2007

100m diameter star is tested with strain gauges in NAVARINO bay


KM3NeT Collaboration Meeting
16 - 18 April 2007



The NESTOR Institute for Astroparticle Physics, which recently became part of the National Observatory of Athens (NOA), invites interested physicists to apply by November 21 for the tenure track position of Associate Researcher (grade gamma). Furthermore, the NESTOR/NOA Institute will have a number of tenured (Research Director or Principal Researcher levels) or other tenure track openings in the near future, inquiries are encouraged. The NESTOR Institute has been awarded a Center of Excellence grant by the General Secretariat for Research and Technology.

IN ADDITION: The Physics Departments of the Universities of Athens and Cyprus, the Institute of Nuclear Physics at the National Center for Scientific Research “Demokritos” and the NESTOR Institute for Astroparticle Physics / NOA are seeking candidates for a number of postdoctoral Research Associate positions (at varying seniority levels) in the field of Neutrino Astropatrticle Physics. Candidates should have experience in the fields of Experimental Particle, Nuclear or AstroPhysics.

The groups mentioned above play leading roles in the NESTOR experiment, hosted by the NESTOR Institute, or the KM3NeT (Cubic kilometer Deep Sea Neutrino Telescope) collaboration and form a significant part of the proponents for the KM3NeT Design Study which has been recently funded by the 6th FP of the E.U..

Successful applicants will participate in the ongoing NESTOR experiment and/or the design and development of the KM3NeT project. Further information for all the above positions can be obtained at the NESTOR Institute ( or by contacting the Institute at email: 


The NESTOR institute contribution to 
the General Secretariat of the Search and Technology Pavilion
in the 69th Thessaloniki International Trade Fair 2004 
(11-19 Sep. 2004) 

November  2003

Volume 43, No. 9



Light in the darkness
Alan Ball and Apostolos Tsirigotis show the first results from NESTOR, the underwater neutrino detector in Greece, and describe just how well the chosen techniques are working

Click to visit the CERN Courier web site

"Light in the darkness"

The main article of the November issue of the CERN Courier describes our first results.

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Date: Mon, 22 Sep 2003
From: Leonidas Resvanis

Dear Colleagues

I am pleased to inform you that a few minutes ago, I saw the printed copy
of the Government Gazette according to which, NESTOR becomes the fifth
Institute of the National Observatory of Athens (NOA).
NOA is the oldest research institution in Greece and was established in 1848.

This, will not change our day to day operations but it will give us
long term stability. Further, since we will have an official seat in
Athens, it should be easier to recruit senior research personnel.


The Future for CERN,
by L. Maiani, 16 Sep, 2003

CERN future LC and other projects


CERN has to participate in Astroparticle Physics projects (choose one !)

  • Space Physics i.e. European base for detector integration e.g. EUSO

  •  Deep Underwater Neutrino Telescopes (NESTOR, ANTARES…)

  •  “Auger” in Northern hemisphere


XIII International Symposium on
Very High Energy Cosmic Ray Interactions
at the NESTOR Institute

Pylos Greece, 6 -12 September 2004

JULY 2003

Volume 44, No. 7


The bottom unit of the NESTOR telescope, deployed at a depth of 4,000 meters in the Ionian Sea, southwest Peleponnese, Greece, with the attached environmental sensors and an electro-optical deep-sea cable, is lowered into the sea. The bend restrictor and the mechanical termination of the cable, the mass anchor (railway heel) and an ocean bottom seismometer are clearly seen. The oversized feet keep the bottom unit from sinking into the clay sediment of the sea bottom.

Our January 2002 deployment article, is published in this July issue of Sea Technology, plus, our pyramid-Bottom Station (LAERTIS) makes the cover picture of this journal.


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E.G. Anassontzis (University of Athens) and P. Koske (University of Kiel) describe a multidisciplinary station with payload exchange, power supply and data transfer in real-time via electro-optical cable.

  •  Deployment 2003 Announcement

March  31, 2003

Last week, the first floor of a NESTOR tower was successfully deployed at the deep-sea site in the Ionian Sea at a depth of 4000 meters. The floor is connected to the shore station and counting room in Methoni by a 28 km. electro-optical cable. Control and read-out systems have been checked out and seem to be operating correctly. Event rates of 0.5 Hz are consistent with expectations at the present tight trigger settings. The programme of calibration and evaluation of the detector has now started.

A floor consists of 12 photomultiplier tubes of 15" diameter, each in a glass pressure housing. The PM's are mounted in pairs, looking upwards and downwards, at the ends of the arms of a semi-rigid titanium frame: the read-out and control electronics for the floor are housed in a titanium sphere of 1 meter diameter at the centre of the frame.

The sea-bottom station (pyramid), attached to the deep-sea end of the electro-optical cable, was brought to the surface. The pyramid houses the junction box, sea electrode (electrical power-return), anchor system and a number of environmental monitors.

Cable connections from the junction box to the titanium sphere were made at the surface and the systems were then lowered into the sea with the detector floor some 150 meters above the pyramid. This operation was accomplished quickly and without problem. The junction box and sphere were powered from the shore station during the deployment and all monitoring systems were  operational. Power to the phototubes was applied several hours after deployment, allowing them to reach their quiescent state after their short exposure to daylight.

The deployment site is a large, underwater plateau off the south western tip of the Peloponnese, only 11 nautical miles from the port of Methoni where the shore station is located. Far from the effluents of major river systems, it benefits from extremely clear water and the low muon background at a depth of 4000 meters.

During the operations last week, the NESTOR team were able to rectify a number of outstanding cable problems which had occurred during the initial cable laying operations in 2000. Many thanks to OTE (Greek Telecom) who have funded the operation and also the purchase of the cable.

Data from a depth of 4000 meters

PMT Pulse Height Distribution

PMT Waveforms Captured Bioluminescence Underwater Currents


On January 14,2002 using the cable ship TENEO the OTE technicians repaired 15 fibers in our umbilical cable to shore (these fibers had been damaged by the ALCATEL cable ship MAERSK FIGHTER in June 2000, while laying the cable). 
We added a 10 km long cable and deployed LAERTIS and the NESTOR bottom fanout station at a depth of 4100m. 
The instrumentation includes an Ocean Bottom Seismometer, an Underwater Current meter, a Nephelometer, Compasses, Pressure meters, Thermometers et.c. plus an acoustic receiving antenna 80m above the bottom in order to receive acoustically transmitted signals via the seawater to the shore. 
Data has been streaming steadily into the Methoni terminal station.
The international record until now , was 1000m.

  JOINT CERN / JNR (Dubna) Summer School for Elementary Particle Physics 

Fourth Workshop on RICH Detectors