Astroparticle school Erlangen 2017 19-10-2017 KM3NeT group meeting 1

Astroparticle school Erlangen 2017 19-10-2017 KM3NeT group meeting 1

School Morning: lecture Dark Energy Gravitational waves Statistical methods Cosmic rays Afternoon: student presentations exercises 19-10-2017 KM3NeT group meeting 2

Chirp mass 20% off of real mass! 19-10-2017 KM3NeT group meeting 3

Student talks Pierre Auger Observatory IceCube MAGIC telescope CHEC-S Fermi LAT ANTARES Xenon1T 19-10-2017 KM3NeT group meeting 4

Student talks Pierre Auger Observatory IceCube MAGIC telescope CHEC-S Fermi LAT ANTARES Xenon1T 19-10-2017 KATRIN KM3NeT group meeting 5

KATRIN 19-10-2017 KM3NeT group meeting 6

Measurement principle Tritium half-life: 12.3 years Do not need to open detector too often Simple nuclear structure Calculations uses first order electroweak theory No nuclear corrections in beta-spectrum calculations Low energy of the decay (18 KeV) Bigger effect of the neutrino mass on beta-spectrum 19-10-2017 KM3NeT group meeting 7

Tail of the spectrum Tail contains information on neutrino mass Last 30 eV measured 19-10-2017 KM3NeT group meeting 8

Set up Pressure: 10-11 bar Detector Spectrometer Pre-spectrometer Pumping system Tritium chamber 19-10-2017 KM3NeT group meeting 9

Spectrometer MAC-E-Filter Particles rotate around magnetic field lines Magnetic field gradient transforms momentum forward: Adiabatic Electric potential reflects low energy electrons Re-accelerate energetic electrons Detector measures energy, radial and temporal information Scintillator vetos cosmic rays 19-10-2017 KM3NeT group meeting 10

Spectrometer www.katrin.kit.edu 19-10-2017 KM3NeT group meeting 11

Issues Background particles Cosmic Natural radioactivity Tritium in the chamber Residual gas becoming ionized 19-10-2017 KM3NeT group meeting 12

www.katrin.kit.edu 19-10-2017 KM3NeT group meeting 13

19-10-2017 KM3NeT group meeting 14

19-10-2017 KM3NeT group meeting 15