Investigation of turbo-molecular pumps in strong magnetic fields |
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| Affiliation: | 1. KIT, IEKP, Postfach 3640, 76021 Karlsruhe, Germany;2. KIT, ITEP, Postfach 3640, 76021 Karlsruhe, Germany;3. KIT, IK, Postfach 3640, 76021 Karlsruhe, Germany;1. Department of Nuclear Engineering, Seoul National University, 559 Gwanak-ro, Gwanak-gu, Seoul, South Korea;2. Korea Institute of Industry Technology, 618-230 Kangsu-gu, Busan, South Korea;1. The Graduate University for Advanced Studies, Toki, Gifu, Japan;2. National Institute for Fusion Science, Toki, Gifu, Japan;1. adixen Vacuum Products, 98 Avenue de Brogny, 74009 Annecy Cedex, France;2. Laboratoire des Technologies de la Microélectronique, LTM-CNRS p/o CEA-LETI, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France;3. CEA, LETI, MINATEC Campus, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France;1. Department for Fusion Plasma Physics, Association EURATOM-VR, School of Electrical Engineering, Royal Institute of Technology, S-10405 Stockholm, Sweden;2. Uppsala Universitet, Tandem Laboratory, Association EURATOM-VR, S-75105 Uppsala, Sweden;3. VTT, Association Euratom-Tekes, PO Box 1000, FI-02044 VTT, Finland;4. JET-EFDA, Culham Science Centre, Abingdon OX14 3DB, UK |
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| Abstract: | In modern particle and accelerator physics as well as in nuclear fusion experiments turbo-molecular pumps (TMP) are used in close proximity to super-conducting magnets. This can cause considerable heating of the fast moving rotor by eddy currents, which can ultimately lead to the destruction of the pump. Motivated by the KATRIN neutrino experiment, where TMPs are operated close to super-conducting magnets, a measurement programme has been elaborated to investigate the effect of magnetic fields on TMPs. An infra-red pyrometer has been used to measure the temperature of the revolving rotor. In addition the effect of different gas loads on the temperature was investigated. With these data a simplified model has been developed to predict the evolution of the rotor temperature over time, using easy to measure parameters. Here we introduce the new model and present first measurements and their application in predicting the rotor temperature in the pulsed field of a nuclear fusion experiment. |
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