KM3NeT M. de Jong Staff overleg 12 Mei 2005

 M. de Jong, P. Kooijman, G. v.d. Steenhoven, E. de Wolf (R. v. Dantzig, J. Engelen, P. de Witt Huberts, J. Oberski)  M. Bouwhuis, R. Bruijn, C. Colnard, G. Lim, B. v. Rens, G. de Vries (A. Heijboer)  E. Heine, J. Hogenbirk, L. Kruijer, H. Peek (E. Kok, P. Rewiersma)  R. v. Wijk, G. Venekamp  E. Berbee, …  B. Verlaat  KVI: N. Kalantar, H. Loehner Who?

What?  Very large neutrino telescope(~20 x Antares)  Cost: ~200 M € (~10 x Antares)  Somewhere in the Mediterranean sea  Antares + Nemo + Nestor + associated scientists Design Study

NIKHEF contributions to Antares  “All-data-to-shore” concept –DWDM –PC farm (‘tier 0’) –Online software (Run control, Trigger, monitoring)  Electrical power system  Passive cooling design  Reconstruction  Physics analyses

Focus  Explore DWDM technology(75%)  Optical module design(5-25%)  Software trigger(75%)  Production of detector units(1/5)

DWDM technology  Optical multiplexing  Modulation of light  Fiber optics NIKHEF High bandwidth (~Tb/s) signal transmission

Optical module design  Small PMTs –Segmentation of photo-cathode (2 hit resolution!) –Solid angle versus photo-cathode area  Time-over-Threshold discriminator –Analogue multiplicity counter Optimise Signal / Noise at PMT level

DWDM + T-o-T + Modulation ~No offshore electronics

Software Trigger  Fast algorithms  Flexible design  Extendable PC farm More Physics

Production (1) Optical module assembly bar ~5 / day Pressure test

Production (2) Line assembly ~500 m ~1 / week ~25 optical modules / line E/O cable

Production (3) Calibration

Production (4) Pylos Sicily Pylos

Summary  Excellent opportunity for NIKHEF to play a leading role in an important experiment  Technology –Collaboration with industry –High-tech fiber optics –State-of-the-art software –‘Tier 0’ design PC farms  Excellent prospects for exciting physics –Great discovery potential –Attractive outreach program