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Flight Model of the Coupled Dark State Magnetometer for the China Seismo-Electromagnetic Satellite |
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Andreas Pollinger2,1, Roland Lammegger2, Werner Magnes1, Christian Hagen1, Michaela Ellmeier1,2, Irmgard Jernej1, Mario Leichtfried1, Christoph Kürbisch1, Rupert Maierhofer2, Robert Wallner1, Gerhard Fremuth1, Christoph Amtmann2, Alexander Betzler2, Magda Delva1, Gustav Prattes1 and Wolfgang Baumjohann1 |
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1. Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042 Graz, Austria 2. Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria |
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The Coupled Dark State Magnetometer (CDSM) is a scalar magnetometer based on two-photon spectroscopy of free alkali atoms. Coherent Population Trapping (CPT) leads to narrow optical resonance features, which enable a precise determination of the magnetic field-dependent Zeeman energy level shifts. Systematic errors, which usually degrade the accuracy of single CPT magnetometers, are cancelled or at least minimized by the use of several CPT resonances in parallel. CPT inherently allows omni-directional measurements. This leads to a moderately complex, all-optical sensor design without double cell units, excitation coils or electro-mechanical parts. The measurement principle was discovered in 2008 [1] and since then the instrument has been developed by the two institutes involved for future space missions [2, 3]. The first demonstration in space takes place aboard the China Seismo-Electromagnetic Satellite (CSES) mission, which was launched into a low Earth orbit in February 2018. Furthermore, the CDSM is baseline instrument for the JUpiter ICy moons Explorer (JUICE) mission of the European Space Agecy (ESA) to visit the Jovian system. The presentation includes an introduction of the measurement principle, the instrument design for the CSES mission, performance characteristics and first in-flight results.
References [1] Roland Lammegger, Method and device for measuring magnetic fields, WIPO, Patent WO/2008/151344 (2008). [2] Andreas Pollinger, Michaela Ellmeier, Werner Magnes, Christian Hagen, Wolfgang Baumjohann, Erich Leitgeb, Roland Lammegger, Enable the inherent omni-directionality of an absolute coupled dark state magnetometer for e.g. scientific space applications, IEEE Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 33 (2012). [3] Andreas Pollinger, Development and Evaluation of a Control Unit for the Coupled Dark State Magnetometer, PhD Thesis, Graz University of Technology (2013). |
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Instrumentation |
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oral |
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