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The Van de Graaff accelerator is used to accelerate very small particles to hyper-velocities, in order to recreate the effects of continual micro-meteoroid dust impacts as encountered on airless bodies such as the Moon and Enceladus, as well as impacts onto X-ray imaging sensors and other spacecraft components.

The Van de Graaff accelerator charges dust particles to ~+20 kV before injecting them into the acceleration tube, where they are exposed to an electric field of up to 2 MV, causing the particles to accelerate to velocities as high as 80 km/s. The particles then enter the drift tube, where they may be filtered, to remove particles outside the desired velocity range for a given experiment. Finally, the particles enter a target chamber, which accommodates both the target, as well as any supporting equipment and instrumentation.

The small target chamber can accommodate a 15 cm diameter surface analogue or spacecraft article. For larger targets, such as complete spacecraft instruments, the large target chamber (1 m diameter) is used.

Specification:

Energy2 MeV
Particle size1 – 5 µm
Particle materialTypically, spherical iron powder.
Particle velocity2 – 80 km/s
Target diameter1 – 80 cm
Time of flight detectors
Particle filtering
Cryogenic target cooling

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