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The KATRIN experiment M. Beck Institut Für Kernphysik Westfälische Wilhelms-Universität Münster Wilhelm-Klemm-str. 9 48149 Münster Motivation The Experiment Principle, Set-up, Status Summary
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The Neutrinomass Experimental detection of neutrino oscillations Neutrinos have got mass How large is m( e ), what is the mass hierarchy? -Oscillations 7,3 10 -5 eV 2 < m 12 2 < 9.3 10 -5 eV 2 solar 1,6 10 -3 eV 2 < m 23 2 < 3.6 10 -3 eV 2 atm. There is a with m i 0,009eV and one with m j 0,05eV 2.0 -decay m( e ) 0,4 eVto be confirmed 3.Tritium -decay m( e ) 2 = -0,6 2,2 2,1 eV 2 Mainz m( e ) 2,3eV (95%) 4.Cosmology m i O(1eV)
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The Neutrinomass Planned sensitivity of KATRIN:0,2eV Detection limit 0,3eV (3 ) / 0,35eV (5 )
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Tritium Decay: 3 H 3 He + + e - + e Tritium -Decay Superallowed E 0 = 18.6 keV t 1/2 = 12.3 a dN/dE = K F(E,Z) p E tot (E 0 -E e ) |U ei | 2 [ (E 0 -E e ) 2 – m( i ) 2 ] 1/2
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The KATRIN experiment Being set-up at the Forschungszentrum Karlsruhe KArlsruhe TRItium Neutrinoexperiment
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Principle: MAC-E Filter Solid angle: Up to 2 Adiabatic: =E /B=const. Resolution: E/E=B min /B max B max = 6T B min 3 10 -4 T E 1eV
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The Tritium-Source: WGTS WGTS: Windowless Gaseous Tritium Source Purpose: Tritium source with high and uniform intensity Properties: = 9cm/L = 10m/B = 3,6T / = 0,1%, T = 0,1K !!! Gas purity 95±1% T2 !!! T 2 -flow: 4,7Ci/s !!! p(T 2 ) max = 4 10 -3 mbar Column density 5 10 17 T 2 /cm 2 10 10 -decays/s
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conzept: 2-Phasen Neon (sied. Flüssigkeit) 2-phase Neon beam pipe Cu Tritium heater s.c. Helium vessel Kr The Tritium-source: WGTS Pressure regulation tested successfully: testexperiment TILO ( constant at ‰ im level) Status: Ordered
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The transport section Purpose: - Transport of the -Electrons to the spectrometers - Prevent the transport of T 2 (Reduction of the flux of T 2 by 10 11 to 10 -14 mbar l/s!!!) Differential pumping sections DPS1-F, DPS2-F Cryopumping sections CPS1-F, CPS2-F
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The transport section Status: DPS2-F under construction TRAP-experiment: cryosorption is working Cryopumping: Cryosorption on Ar-snow Testexperiment TRAP: DPS2-F
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The prespectrometer Purpose: MAC-E filter for the suppression of -electrons with E <18,4keV Fixed retardation potential of 18,4kV = 1,7m/L = 4,2m, B max = 4,5T, B min = 0.025T Reduction of electron-flux 10 -7 E 70-80eV
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The prespectrometer at FZK Since end of 2003 at the Forschungszentrum Karlsruhe
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The prespectrometer at FZK Wire electrode NEG (10000l/s) Status: Vaccuum tests successfull: p < 10 -11 mbar EMD-test in progress since July 2006
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The main spectrometer Purpose: MAC-E filter for the precision measurement of the endpoint region of the Tritium -spectrum Variable retardation potential 18,5-18,6kV =10m/L=23m, B max = 6T, B min = 3 10 -4 T vacuum < 10 -11 mbar !!! E 1eV
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An end section Deggendorf, 14.3.2006
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The spectrometer tank Deggendorf, 14.3.2006 June 2006
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The wire elctrode
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The wire electrode 5 x 20 cylinder 3 x 20 large cone 1 x 10 small cone Sum: 240 moduls!
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The wire electrode Single module: ca. 1.50 m x 1.80 m 2 combs connected via 4 C-profiles „Combs of stainless steel“: Cut by water or laser
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The wire electrode C-profile Comb 1. layer Ø 0.3 mm 2. layer Ø 0.2 mm 70 mm 25 mm Prototype, U Münster Prototype in Münster
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The detector Purpose: Position sensitive detection of the electrons Status: Under development Segmented Si-PIN diode Detector of prespectrometer
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Schedule First components already set up at FZK: Prespectrometer → vacuum- and EMD-tests Installation of the main spectrometer at FZK planned for end of 2006 (Mass-)production of the wire electrode modules in Münster in 2007 → installation end of 2007 Test measurements with a Krypton-source (U Münster) at the main spectrometer in 2008 Installation of the Tritium-source in 2008 Tritium measurements will start in 2010 Work on the building for the main spectrometer at FZK
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Summary The aim of KATRIN is to search for the neutrino mass in the region 0,2-2eV → distinguish between hierarchical and degenerate mass models → cosmologically relevant For the specifications see KATRIN design report 2004 FZKA Scientific Report 7090 The main components are under construction Measurements with KATRIN will start in 2010
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