Berlin 2008 – wissenschaftliches Programm
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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 2: Vacuum pumps and gauges
VA 2.1: Vortrag
Montag, 25. Februar 2008, 12:00–12:20, H 0106
Investigations of turbo-molecular pumps in magnetic fields for the KATRIN experiment — •Aleksandra Gotsova and Norbert Kernert — Tritiumlabor, Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe (KATRIN Collaboration)
The KArlsruhe TRItium Neutrino experiment (KATRIN) aims to measure the electron neutrino mass from the β-decay of tritium with an unprecedented sensitivity of 0.2 eV/c2. The decay electrons will be guided magnetically from the gaseous tritium source through a differential pumping section (DPS) to the high resolution spectrometer. The DPS consists of a beamline with super-conducting magnets and 16 turbo-molecular pumps (Leybold WMAG 2800), which have to prevent tritium gas from entering the UHV spectrometer section.
Systematic studies have been conducted, investigating the rotor temperature and stability of operation of the turbo-molecular pumps (TMP) at full speed as a function of magnetic field strength and direction of the field. The temperature of the moving rotor was measured in vacuum with an infra-red camera. In addition the stability of the pump controller in magnetic fields has been tested. This talk reports on the results of these measurements, giving limits for the save operation of TMPs in magnetic fields.
In part supported by BMBF project 05CK5VKA/5.