Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 29: Astroparticle Physics

HK 29.5: Talk

Tuesday, March 17, 2009, 15:15–15:30, H-ZO 70

A large air coil system and precision magnetic monitoring at the KATRIN main spectrometer — •Jan Reich — Universität Karlsruhe (TH), Institut für Experimentelle Kernphysik

The aim of the KArlsruhe TRItium Neutrino experiment KATRIN is the determination of the absolute mass of the electron antineutrino with a sensitivity of 0.2 eV. The experiment will scan the endpoint region of the tritium beta decay spectrum with a spectrometer based on the MAC-E filter principle (Magnetic Adiabatic Collimation with an Electrostatic filter).

The magnetic field of the latter, especially in the analysing plane, has to fulfill certain criteria. The field gradually decreases over a length of 12 meters by a factor of 20000. Thus, in the analysing plane, the magnetic field is very low and the earth's magnetic field contributes a non-negligible part to it. By this influence the magnetic fluxtube is distorted. The axial symmetry and homogenity of the B-field is crucial to avoid background and achieve a high energy resolution.

For these reasons an external air coil system for compensating the earth's magnetic field as well as a low field correction coil system for fine tuning will be installed around the KATRIN main spectrometer in addition to a magnetic monitoring system.

Supported by the BMBF under contract 05A08VK2 and the DFG under SFB Transregio 27.