Preparation for Containerless Processing on ISS: Parabolic Flights with the TEMPUS Facility

Details Preparation for Containerless Processing on ISS: Parabolic Flights with the TEMPUS Facility Preparation for Containerless Processing on ISS: Parabolic Flights with the TEMPUS Facility

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.543d&link_type=abstract

IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,

Physics

Condensed Matter

Materials Science

Scientific paper

The concept of electro-magnetic levitation as a means for measuring material parameters of liquid metals over a wide temperature range under microgravity conditions has been successfully applied in the Spacelab facility TEMPUS. This German payload was flown on the international missions IML- 2, MSL-1 and MSL-1R as well as on six parabolic flight campaigns yielding new results on thermo- physical properties and solidification behavior of undercooled metals and alloys. It is planned to further enhance the established electro-magnetic levitation technique and to develop a new ISS facility, the Electromagnetic Levitator (EML), which shall be a contribution to the ESA payload Materials Sciences Laboratory (MSL). The EML features a highly modular facility concept, with respect to subsystem components and diagnostics features. The sample positioning and heating shall be achieved by use of one single RF coil where the positioning and heating currents are superpositioned. A milestone in this development line has been the performance of a parabolic flight campaign performed with the Airbus A300 as part of the 3rd DLR campaign with an advanced (1) TEMPUS breadboard. During two flight days, a thorough facility test program proved that the newly implemented superpositioning principle concept in combination with two new coil designs stably positions and heats a variety of test samples. The third flight day was dedicated to scientific experiments. For viscosity measurements, sample surface oscillations were induced by applying short heater pulses during sample cooling. During undercooling experiments, the recalescence events were captured with an acquisition rate of 100kHz. In parallel to the envisaged hardware development of the MSL-EML facility, further parabolic flight campaigns both for facility testing and scientific research are planned, with the next campaign planned for November 2002. The paper will provide a brief overview of the MSL-EML features (2) , focus on the results obtained during the parabolic flight campaign performed in November 2001 and give an outlook on the envisaged further MSL-EML development steps. (2)

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