1. 1 Deep Sea Neutrino Telescope Detection Principle

2. 2 Basic Properties of Neutrino Spin: ½ (fermion) Type: lepton Flavors: muonic, electronic, tau Masses: very small (different masses) Interactions: Weak, Gravitation Peculiarities: flavor oscillations Detection: only through interactions μ+ W+ u

3. 3 Interaction Volume νμνμ Θ ν-μ μ Detector (Electromagnetic Interactions) Detection Principle Large Interactive Volume Efficient μ Detection μ-μ- νμνμ μ- W-W- d

4. 4 Cherenkov Radiation + - + - + - + - +- + - + - + - + - + - + - + - + - +- + - + - + - + - + - + - + - + - + - + - + - + - + -

5. 5 Properties

6. 6 Photo-Sensor (Photomultiplier- PMT) Cherenkov Wavefront Experimental Principle Muon Trajectory Cherenkon Photon Path

7. 7 PMT signals Muon Tracking

8. 8 How clean ? How deep ? Cosmic μ background

9. 9 Energy dependent Direction dependent Tracking Resolution Estimated by Monte Carlo Integration Effective Area Geometrical acceptance  Reconstruction Efficiency Good Tracking Resolution & Large Effective Area for all Energies and Directions