Surface Dust Analyser
The SUrface Dust Analyser is a time-of-flight mass spectrometer of reflectron-type that employs impact ionization and is optimised for a high mass resolution. The instrument was selected in May 2015 to fly on board the Europa Clipper mission, that is planned for 2025 to Jupiter's moon Europa.
This instrument will measure the composition of small, solid particles ejected from Europa, providing the opportunity to directly sample the surface and potential plumes on low-altitude flybys. Europa's internal liquid water ocean has been identified as one of the locations in the Solar System that may offer habitable environments to microbial extraterrestrial life.
Overview
The basic idea of compositional mapping is that moons without an atmosphere are surrounded by clouds of dust particles released from their surfaces by meteoroid bombardment. The ejected particles can be sampled and their composition analyzed from orbit or during a spacecraft flyby. Since these grains are direct samples from the moons' icy surfaces, determination of their composition will help to define and constrain the geological activities on and below the moons' surface, the exchange processes with the deeper interior, and assess its internal ocean habitability potential. The instrument is capable of identifying traces of organic and inorganic compounds in the ice of ejecta.The SUDA instrument has technological heritage from the Cassini CDA and the Stardust CIDA instruments. The Principal Investigator is Sascha Kempf, from the University of Colorado Boulder. Co-investigators on the instrument include Mihaly Horanyi and Zoltan Sternovsky.
| Parameter | Units/performance |
| Mass | |
| Dimensions | 26.8 × 25.0 × 17.1 cm3 |
| Sensitive area | 220 cm2 |
| Effective mass resolution | 200 to 250 m/Δm |
| Mass range of interest | 1-250 amu |
Objectives
The SUDA objectives are:- Provide a spatially resolved compositional map of Europa for the regions along the groundtracks of the orbiter's flybys.
- Characterize the alteration of Europa's surface via exogenous dust impacts by measuring the composition, size, speed, and spatial distribution of dust in the vicinity of the moon.
- Investigate the local plasma environment of Europa by measuring the electrostatic charge of dust particles in the vicinity of the moon.