Neutral tritium gas reduction in the KATRIN differential pumping sections

Abstract

The KArlsruhe TRItium Neutrino experiment (KATRIN) aims to measure the effective electron anti-neutrino mass with an unprecedented sensitivity of $0.2\mathrm{eV}/{\mathrm{c}}^2$, using $\beta$-electrons from tritium decay. The electrons are guided magnetically by a system of superconducting magnets through a vacuum beamline from the windowless gaseous tritium source through differential and cryogenic pumping sections to a high resolution spectrometer and a segmented silicon pin detector. At the same time tritium gas has to be prevented from entering the spectrometer. Therefore, the pumping sections have to reduce the tritium flow by more than 14 orders of magnitude. This paper describes the measurement of the reduction factor of the differential pumping section performed with high purity tritium gas during the first measurement campaigns of the KATRIN experiment. The reduction factor results are compared with previously performed simulations, as well as the stringent requirements of the KATRIN experiment.

arXiv comment19 pages, 4 figures, submitted to Vacuum

References in corpus (10)

• Evidence for oscillation of atmospheric neutrinos
• Status of neutrino oscillations 2018: first hint for normal mass ordering and improved CP sensitivity
• An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN
• Cosmological Axion and neutrino mass constraints from Planck 2015 temperature and polarization data
• Monitoring of the operating parameters of the KATRIN Windowless Gaseous Tritium Source
• First operation of the KATRIN experiment with tritium
• Commissioning of the vacuum system of the KATRIN Main Spectrometer
• First transmission of electrons and ions through the KATRIN beamline
• Effects of neutrino mass and asymmetry on cosmological structure formation
• Modelling of gas dynamical properties of the KATRIN tritium source and implications for the neutrino mass measurement

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• Search for Lorentz-Invariance Violation with the first KATRIN data
• Wideband precision stabilization of the -18.6 kV retarding voltage for the KATRIN spectrometer
• Background reduction at the KATRIN experiment by the shifted analysing plane configuration
• Operation Modes of the KATRIN Experiment Tritium Loop System using ${}^{83\mathrm{m}}$Kr
• Forward Beam Monitor for the KATRIN experiment
• A method for determining the transition energies of ${}^{83m}$Kr at the KATRIN experiment
• Measurement of the electric potential and the magnetic field in the shifted analysing plane of the KATRIN experiment
• Measurement of the inhomogeneity of the KATRIN tritium source electric potential by high-resolution spectroscopy of conversion electrons from ${}^{83m}$Kr
• Monte Carlo simulations of the electron-gas interactions in the KATRIN experiment