Table 1 MEP-i performance and specifications
From: Medium-energy particle experiments–ion mass analyzer (MEP-i) onboard ERG (Arase)
Parameter | Value | Notes |
|---|---|---|
Energy range | 10–180 keV/q | |
Energy resolution | 7% | FWHM |
37% | SV step interval | |
Analyzer constant | 18 | |
Number of energy steps | 16 per spin | The first-step data were not used for scientific analyses due to the slow ramping of SV |
Mass discrimination | H+, He++, He+, O++, O+ and O2 + | |
FOV | 360° (azimuth) × 2.7° (elevation) | Azimuthal gaps between detectors |
10.5° (azimuth) × 2.7° (elevation) per anode | FWHM | |
Number of anodes | 16 | Circularly arrayed |
Geometric factor of ESA | 2.9 × 10−4 cm2 sr eV/eV per anode (normal channel) | Calculated in the numerical model |
6.0 × 10−5 cm2 sr eV/eV per anode (narrow channel) | Calculated in the numerical model | |
Time resolution | 4 s per full 3-D distribution function 500 ms per energy sweep (16 steps) 31.3 ms per energy step | For normal spin of 8 s |
Sensor size | ϕ310 mm × 402 mm | Including an electronics box for the CPU and power supply unit (PSU) |
Sensor mass | 9.8 kg | |
Power consumption | 23 W | The efficiency of PSU is 60% |
Data size | 6.556 kBytes per energy sweep | Before compression and reduction |