Regensburg 2016 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 3: Vacuum Generation & Measurement

VA 3.2: Vortrag

Montag, 7. März 2016, 14:45–15:15, H25

Design development of a Linear Diffusion Pump — •Holger Strobel, Christian Day, Thomas Giegerich, and Ralf Müller — Institut für Technische Physik (ITEP), Karlsruher Institut für Technologie (KIT), Campus Nord, Eggenstein-Leopoldshafen, D-76344

In fusion power plants, the hydrogen isotopes deuterium and tritium are merged together to helium under the release of huge amounts of energy. The fusion reaction takes place in a plasma contained in vacuum. Fusion reactors require very large vacuum chamber and a powerful vacuum pumping system that is able to pump the reactor down and to keep the vacuum against a certain fuelling gas flow. For the primary pumps, linear mercury diffusion pumps (LDPs) have been proposed by KIT and are now under development.

The LDPs need to be supplied with mercury vapour (433 K), cool water (273 K) and a heat transfer fluid to supply the two internal baffles (180 K, 220 K) that trap the mercury inside the pump. The different temperature and pressure levels lead to high mechanical stresses in the pump case and thus require a full mechanical simulation of the pump using finite element methods. Furthermore, a bake-out of the pump must be possible and, for safety reasons, an internal explosion must be tolerated.

This talk gives an overview on the development of the LDP starting from a conceptual design. During this work, different load cases have been simulated using ANSYS and a more detailed design has been elaborated in an iterative process.