Regensburg 2022 – wissenschaftliches Programm
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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 2: Vacuum technology: New developments and applications
VA 2.1: Vortrag
Montag, 5. September 2022, 12:30–13:10, H12
Experimental characterisation of a NEG pump of novel size - a major step to its application in neutral beam injectors of future fusion devices — •Stefan Hanke1, Christian Day1, Thomas Giegerich1, Xueli Luo1, Fabrizio Siviero2, Michele Mura2, Enrico Maccallini2, Paolo Manini2, Emanuele Sartori3, Marco Siragusa3, and Piergiorgio Sonato3 — 1KIT, Karlsruhe, Germany — 2SAES Getters, Lainate, Italy — 3Consorzio RFX, Padova, Italy
Future fusion plants require plasma heating including neutral beam injectors (NBI), demanding pumping speeds of several 1000 m3/s. A concept to replace the currently used customized cryopumps is based on the high capacity getter ZAO. In a 6 years systematic technology development, the concept of a NBI NEG pump was derived, starting with comprehensive material characterisation, expanded to pumping and regeneration characteristics of ZAO and to heating and thermal management of larger arrangements for scalability and control. The recent step was design, manufacturing and operation of a large NEG pump for demonstration and to confirm scalability. The resulting pump with 15 kg of ZAO was tested in the TIMO facility at KIT. The achieved experimental results, regarding sorption characteristics (depending on pressure, gas flux, getter temperature, loading of the getter with gas, isotope) and regeneration behaviour are described. Subsequently the entire setup was replicated in detail in the TPMC code ProVak3D to find the real sticking factor. With this, the performance of any advanced future arrangement of NEG cartridges can be predicted now.