SULEICA SULEICA 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:
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| 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.
