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Tritium ions in KATRIN: blocking, removal and detection

Klein, Manuel

Abstract (englisch):
The KArlsruhe TRItium Neutrino (KATRIN) experiment aims at the model-independent determination of the absolute neutrino mass scale.
For this purpose, KATRIN investigates the imprint of the neutrino mass on the tritium beta spectrum near its kinematic end point.
KATRIN employs a high-luminosity Windowless Gaseous Tritium Source (WGTS), which creates $10^{11}$ beta electrons per second.
The beta electrons are guided by a strong magnetic field up to 6 T to the Main spectrometer, which acts as a high-pass MAC-E filter.

Inadvertently, tritium ions are created from the source gas by tritium beta decay and inelastic scattering of beta electrons.
Under nominal conditions, $2\cdot 10^{11}$ positive ions/s leave the WGTS along the magnetic guiding field towards the spectrometers.
There, they could create background due to the radioactivity of the tritium and via the ionisation of residual gas.
For this reason, the ion flux into the Pre-spectrometer (PS) has to be restricted to $1\cdot10^4$ ions/s.

Ring and dipole electrodes were therefore installed in the KATRIN beamline in order to block the positive tritium ions with electrostatic potentials and to remove the stored ions via $E\times B$ drift in negative dipole potentials.
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Volltext §
DOI: 10.5445/IR/1000093526
Veröffentlicht am 17.04.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Hochschulschrift
Publikationsjahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000093526
HGF-Programm 51.03.01 (POF III, LK 01)
Verlag Karlsruhe
Umfang XI, 340 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Institut für Experimentelle Teilchenphysik (ETP)
Prüfungsdatum 14.12.2018
Referent/Betreuer Prof. G. Drexlin
Projektinformation 05A2017 - KATRIN (BMBF, 05A17VK2)
Schlagwörter KATRIN, neutrino mass, tritium, ions
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