Dresden 2017 – scientific programme

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 1: Vacuum Generation and Measurement

VA 1.2: Talk

Monday, March 20, 2017, 09:45–10:15, HSZ 301

Measurement of the Rotor Temperature of shielded TMPs in Magnetic Fields for the KATRIN Experiment — •Fabio Bertucco and KATRIN Collaboration — Karlsruhe Institute of Technology (KIT), IEKP, Postfach 3640, 76021 Karlsruhe

When turbo-molecular pumps (TMP) are operated in an external magnetic field, one needs to know the influence of eddy currents on the rotor temperature to ensure safe operating conditions. For long-term operation a rotor temperature below 90 ^∘C is recommended. At temperatures above 120 ^∘C the thermal expansion of the rotor can exceed the gap between stator and rotor, causing a collision. The Karlsruhe Tritium Neutrino (KATRIN) experiment operates more than 20 magnetically levitated TMPs close to superconducting solenoids in magnetic fields up to 18 mT. Since the temperature of the fast moving rotor can not be measured directly, a test setup with Helmholtz coils and an infrared pyrometer for the temperature measurement was used at KIT to investigate the rotor temperature for different magnetic field. In order to operate the TMPs as close to the KATRIN components as possible they have been encased in a magnetic shielding. This talk will present measurements with different TMPs in magnetic fields up to 20 mT with and without shielding. We acknowledge the support by KSETA, BMBF (05A14VK2), HAP and the Helmholtz association.