Technical design and commissioning of the sensor net for fine meshed measuring of magnetic field at KATRIN Spectrometer

TL;DR

This paper details the design and commissioning of a fine-meshed sensor network for precise magnetic field measurement inside the KATRIN spectrometer, crucial for accurate neutrino mass determination.

Contribution

It introduces a novel magnetic field sensor network with high spatial resolution for detailed magnetic field mapping in the KATRIN spectrometer.

Findings

Successful deployment of sensor networks around the spectrometer

High-resolution magnetic field data collection capabilities

Insights into magnetic material influence near the spectrometer

Abstract

The KArlsruhe TRItium Neutrino experiment (KATRIN) aims to measure the absolute neutrino mass scale with an unprecedented sensitivity of 0.2 eV/c2 (90% C.L.), using beta decay electrons from tritium decay. The kinetic energy of the decay electrons is measured using an electrostatic integrating main spectrometer (MS) with magnetic adiabatic collimation and requires a certain magnetic field profile. For the control of the magnetic field in the MS area two networks of mobile magnetic field sensor units are developed and commissioned. The radial system is operated close to the outer surface of the MS whereas the vertical one is mounted along vertical planes left and right of the MS. The sensor setup can take several thousands magnetic field samples at a fine meshed grid, thus allowing to study the magnetic field inside the MS and the influence of magnetic materials in the vicinity of the main spectrometer.