Forward Beam Monitor for the KATRIN experiment
A. Beglarian, E. Ellinger, N. Hau{\ss}mann, K. Helbing, S. Hickford,, U. Naumann, H.-W. Ortjohann, M. Steidl, J. Wolf, and S. W\"ustling

TL;DR
The paper presents the design and implementation of a precise, robust forward beam monitor system for the KATRIN experiment, capable of operating in challenging cryogenic, magnetic, and vacuum conditions to ensure accurate neutrino mass measurements.
Contribution
This work introduces a novel, highly precise beam monitoring system with a specialized mechanical setup and silicon detectors for the KATRIN experiment, addressing environmental challenges.
Findings
Achieved a positioning precision better than 0.3 mm.
Measured beta-electron flux with 0.1% precision in 60 seconds.
Operated successfully in cryogenic, high magnetic field, and ultra-high vacuum conditions.
Abstract
The \textit{KArlsruhe TRItium Neutrino} (KATRIN) experiment aims to measure the neutrino mass with a sensitivity of \SI{0.2}{\electronvolt} (\SI{90}{\percent} CL). This will be achieved by a precision measurement of the endpoint region of the -electron spectrum of tritium decay. The -electrons are produced in the \textit{Windowless Gaseous Tritium Source} (WGTS) and guided magnetically through the beamline. In order to accurately extract the neutrino mass the source activity is required to be stable and known to a high precision. The WGTS therefore undergoes constant extensive monitoring from several measurement systems. The \textit{Forward Beam Monitor} (FBM) is one such monitoring system. The FBM system comprises a complex mechanical setup capable of inserting a detector board into the KATRIN beamline with a positioning precision of better than…
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Taxonomy
TopicsNeutrino Physics Research · Dark Matter and Cosmic Phenomena · Particle Detector Development and Performance
