Dresden 2017 – wissenschaftliches Programm
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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 1: Vacuum Generation and Measurement
VA 1.1: Hauptvortrag
Montag, 20. März 2017, 09:00–09:45, HSZ 301
Assessment of a Pressure Gauge Filament for Neutral Gas Density Measurement using Alternating Current as Source Power — •Nikola Jaksic, Hans Meister, and Andrea Scarabosio — Max Planck Institute for Plasma Physics, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany
Vacuum in plasma fusion research is primarily required to guarantee interference-free fusion processes of the hydrogen isotopes deuterium and tritium and additionally as an insulator between very hot particles and solid objects. Moreover, vacuum is required in cryogenic areas of the fusion device e.g. for insulation of super conducting coils which operate at 4 K. An overview of the existing vacuum measurement systems and the measurement system which fulfill the essential demands for the ITER experiment, currently under construction is presented. In plasma fusion research the neutral gas density is usually measured using hot cathode ionization gauges which are modified for the application in high magnetic fields and for a measurement range between 10−4 Pa and 20 Pa. For obtaining sufficient electron emission, high filament temperatures in the order of 1800 K are required and thus high usually direct heating currents. The heating current to achieve the right operational temperature could be reduced by using a thinner filament in combination with alternating current with suitably chosen frequency. To estimate the suitability of such a solution a feasibility study by means of numerical methods has been carried out. The results of the filament preliminary numerical analyses are presented.