Sensitivity and fragmentation calibration of the ROSINA double focusing mass spectrometer

Hässig, Myrtha (2013). Sensitivity and fragmentation calibration of the ROSINA double focusing mass spectrometer. (Dissertation, Universität Bern, Philosophisch-naturwissenschaftliche Fakultät, Physikalisches Institut)

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The goal of this work has been to calibrate sensitivities and fragmentation pattern of various molecules as well as further characterize the lab model of the ROSINA Double Focusing Mass Spectrometer (DFMS) on board ESA’s Rosetta spacecraft bound to comet 67P/Churyumov-Gerasimenko. The detailed calibration and characterization of the instrument is key to understand and interpret the results in the coma of the comet. A static calibration was performed for the following species: Ne, Ar, Kr, Xe, H2O, N2, CO2, CH4, C2H6, C3H8, C4H10, and C2H4. The purpose of the calibration was to obtain sensitivities for all detectors and emissions, the fragmentation behavior of the ion source and to show the capabilities to measure isotopic ratios at the comet. The calibration included the recording of different correction factors to evaluate the data, including a detailed investigation of the detector gain. The quality of the calibration that could be tested for different gas mixtures including the calibration of the density inside the ion source when calibration gas from the gas calibration unit is introduced. In conclusion the calibration shows that DFMS meets the design requirements and that DFMS will be able to measure the D/H at the comet and help shed more light on the puzzle about the origin of water on Earth.

Item Type:

Thesis (Dissertation)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Hässig, Myrtha and Altwegg, Kathrin

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

Language:

English

Submitter:

Igor Hammer

Date Deposited:

18 Apr 2016 15:11

Last Modified:

08 Sep 2017 10:59

URN:

urn:nbn:ch:bel-bes-2118

Additional Information:

e-Dissertation (edbe) ; Die Seiten 127-132 sind aus urheberrechtlichen Gründen in der Online-Version nicht enthalten, können aber in der gedruckten und in der CD-ROM-Version konsultiert werden (zB. in der Universitätsbibliothek Bern).

BORIS DOI:

10.7892/boris.81224

URI:

https://boris.unibe.ch/id/eprint/81224

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