HILT: a heavy ion large area proportional counter telescope forsolar and anomalous cosmic rays

The HILT sensor has been designed to measure heavy ion elemental abundances, energy spectra, and direction of incidence in the mass range from helium to iron and in the energy range 4-250 MeV/nucleon. With its large geometric factor of 60 cm² sr the sensor is optimized to provide compositional and spectral measurements for low-intensity cosmic rays, i.e., for small solar energetic particle events and for the anomalous component of cosmic rays. The instrument combines a large-area ion-drift-chamber-proportional-counter system with two arrays of 16 Li-drifted solid state detectors and 16 CsI crystals. The multi-dE /dx-E technique provides a low-background mass and energy determination. The sensor also measures particle direction. By combining these measurements with the information on the spacecraft position and attitude in the low-altitude polar orbit, it will be possible to infer the ionic charge of the ions from the local cutoff of the Earth's magnetic field. The ionic charge in this energy range is of particular interest because it provides unique clues to the origin of these particles and has not been investigated systematically so far     

The Time-of-Flight Spectrometer SULEICA for Ions of the Energy Range 5-270 keV/Charge on AMPTE IRM

The Suprathermal Energy Ionic Charge Analyzer (SULEICA) on AMPTE IRM is an instrument to determine the ionic charge state and mass composition of all major ions from H through Fe for energies of the suprathermal plasma (?5 up to ?270 keV/charge) by the use of electrostatic deflection, time-of-flight measurement, and energy analysis in solid-state detectors. With its acceptance fan of 400° X 10° the instrument scans a field of 360° by 40° in the satellite spin plane. The data contain counting rate information for the evaluation of absolute particle fluxes, live pulse-height events, and matrix rates for selected ions from on-board processing with a microprocessor.