Development of a low energy ion source for ROSINA ion mode calibration

Details Development of a low energy ion source for ROSINA ion mode calibration Development of a low energy ion source for ROSINA ion mode calibration

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rsci...77j3302r&link_type=abstract

Review of Scientific Instruments, Volume 77, Issue 10, pp. 103302-103302-8 (2006).

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Ion Sources: Positive And Negative, Gravitational Radiation Detectors, Mass Spectrometers, And Other Instrumentation And Techniques, Standards And Calibration

Scientific paper

The European Rosetta mission on its way to comet 67P/Churyumov-Gerasimenko will remain for more than a year in the close vicinity (1 km) of the comet. The two ROSINA mass spectrometers on board Rosetta are designed to analyze the neutral and ionized volatile components of the cometary coma. However, the relative velocity between the comet and the spacecraft will be minimal and also the velocity of the outgassing particles is below 1 km/s. This combination leads to very low ion energies in the surrounding plasma of the comet, typically below 20 eV. Additionally, the spacecraft may charge up to a few volts in this environment. In order to simulate such plasma and to calibrate the mass spectrometers, a source for ions with very low energies had to be developed for the use in the laboratory together with the different gases expected at the comet. In this paper we present the design of this ion source and we discuss the physical parameters of the ion beam like sensitivity, energy distribution, and beam shape. Finally, we show the first ion measurements that have been performed together with one of the two mass spectrometers.

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