Science Seminars

Methods for the investigation of hypervelocity impacts of micrometer and sub-micrometer sized particles

Speaker: Anna Mocker
Date: Thursday, Apr 05, 2012
Time: 4:00 PM to 5:00 PM
Location: LSTB-299

Seminar Abstract:

Impact physics plays an important role in a variety of field such as investigation of matter at extreme pressures and temperature, shock waves in solid bodies or planetology and cosmic dust research.. The processes of interest are the generation of impact plasma, neutrals, secondary ejecta, and electromagnetic (EM) radiation. To relate the measured valued resulting from in hypervelocity impact experiments with the impact parameters (speed, mass, composition) of individual particle impacts a comprehensive set of experiment is needed with well known experimental conditions, and a wide variety of diagnostic tools. For these experiments dust particles are accelerated to hypervelocity speeds in the laboratory with an electrostatic accelerator. We started a detailed set of investigations using time-of-flight (TOF) mass spectrometry, and a complementary analysis of the emerging EM signals over a wide range of frequencies. These studies provide new insights into the physics of hypervelocity impacts and the short timescale high-pressure states of matter, they also lead to the development of new instrument concepts for the detection and characterization of cosmic dust in space.