Abstract
The KArlsruhe TRItium Neutrino (KATRIN) experiment, which aims to make a direct and model-independent determination of the absolute neutrino mass scale, is a complex experiment with many components.More than 15 years ago, we published a technical design report (TDR) [1] to describe the hardware design and requirements to achieve our sensitivity goal of 0.2 eV at 90% C.L. on the neutrino mass.Since then there has been considerable progress, culminating in the publication of first neutrino mass results with the entire beamline operating [2].In this paper, we document the current state of all completed beamline components (as of the first neutrino mass measurement campaign), demonstrate our ability to reliably and stably control them over long times, and present details on their respective commissioning campaigns.
Highlights
The determination of the neutrino mass plays an important role in cosmology, particle physics, and astroparticle physics
The results shown in figure 19 yield the specified homogeneity of ±10 % over the entire Rear Wall (RW) up to its maximal radius of 7 cm
The upgrade has been successfully used for the e-gun operating in pulse mode with varying multiplicities per pulse and varying spread in arrival times; this resulted in challenging peak pile-up situations at ∼10 kcps/pixel, but use of an algorithm, utilizing the bipolar shaper information, accurate counting with less than 0.1% correction errors was achieved
Summary
The determination of the neutrino mass plays an important role in cosmology, particle physics, and astroparticle physics. This paper, which builds on the original technical design report (TDR) [1], will focus on hardware implementation and commissioning results, and various systems for calibration and monitoring. It describes the status of all systems as they were during the first neutrino mass measurement campaign. The hardware implementation is described in the corresponding sections below, which include the source, transport, spectrometer, and detector sections. Each of these has undergone its respective commissioning phase. Additional systems for monitoring every operating parameter — from the source gas composition and activity to the adjustment of the spectrometer’s high voltage — have successfully demonstrated the KATRIN experiment’s ability to meet its design requirements for stability and control
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