The SULEICA instrument on AMPTE/IRM measures the charge state and mass of all major ions from H through Fe for energies from about 5 keV to 230 keV. It does this using a combination of electrostatic deflection, a time-of-flight measurement, and an energy measurement in solid state detectors. The measurement technique is illustrated in figure 1. To see a photo of Dr. Möbius with the instrument, click here. The instrument characteristics are summarized below:
|Energy Range||5 to 270 keV/e in up to 24 energy steps (mode dependent)|
|Energy Resolution (analyzer)||dE/E||0.097|
|Mass-per-Charge Resolution||dM/Q / M/Q||0.13|
|Geometric Factor||0.043 cm2-ster|
|Time resolution||*see below|
|Angular resolution||H+, He++||16 azimuthal sectors|
|other ions||8 azimuthal sectors|
|View Angle in elev/azi||±20°/ ±5°|
* The instrument measures one energy step per spin. Therefore the time resolution for a full measurement is the spin period (about 4.4 s) times the number of energy steps. The number of energy steps depends on the mode. Two common modes were 6 energy steps (10,20,40,80,160,226 keV) with a time resolution of 27 seconds, and 19 energy steps, with a time resolution of 84 seconds.
For more information, see:
Möbius, E., et al., The Time-of-Flight Spectrometer SULEICA for Ions of the Energy Range 5-270 keV/charge on the AMPTE IRM, IEEE Trans. Geosci. Remote Sens., GE-23, 274, 1985.