RAPID - Research with Adaptive Particle Imaging Detectors
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The RAPID spectrometer for the Cluster mission is an advanced particle detector for the analysis of suprathermal plasma distributions in the energy range from 20-400 keV for electrons, 40-1500 keV (4000 keV) for hydrogen, and 10 keV/nuc - 1500 keV (4000 keV) for heavier ions. Novel detector concepts in combination with pin-hole acceptance allow the measurement of angular distributions over a range of 180° in polar angle for either species. The detection principle for the ionic component is based on a two-dimensional analysis of the particle's velocity and energy. Electrons are identified by the well known energy-range relationship.
Characteristic Parameters of the RAPID Instrument
IIMS | IES | |
Energy range (keV) | ||
Hydrogen | 28 - 4007 | |
Helium | 137 - 3800 | |
CNO | 274 - 4046 (Oxygen) | |
Electrons | 309 - 406 | |
Mass Classes (amu) | 1, 4, 12 - 16, 28 - 56 | |
Mass Resolution (A/dA) | 4 (Oxygen) | |
Field-of-View | ±3° ×180° | ±17.5° ×180° |
Angular Coverage | ||
Polar (Range/Intervals) | 180°/12 | 180°/9 |
Azimuthal (Range/Sectors) | 360°/16 | 360°/16 or 8 |
Range/ Steps | 0 - 10 / 16 | |
Geometric Factor (cm2.sr) | ||
Total (180°)/per pixel | 2.7 × 10-2 / 2.2 × 10-3 | 2.0 × 10-2/2.2 × 10-3 |
Further Information: