Medium-energy particle experiments–ion mass analyzer (MEP-i) onboard ERG (Arase)

Earth, Planets and Space

Table 2 Observation modes of the MEP-i

Mode	Size (Byte)	Data	Notes
Normal	4096	16-bit counter × 16 × 16 × 8 (SV, AZ, TOF)	8 TOF groups are sorted using the m/q tables
Normal	640	32-bit list data, 160 events at maximum
TOF	4096	16-bit counters: × 4 × 512 (AZ, TOF)
	48	24-bit counters (start only) × 16 (AZ)	For in-flight calibration
	48	24-bit counters (stop only) × 16 (AZ)	For in-flight calibration
	48	24-bit counters (double coincidence) × 16 (AZ)	For in-flight calibration
	640	32-bit list data, 160 events at maximum	PH is not available
SSD	4096	16-bit counter × 16 × 8× 16 (SV, AZ, E)	TOF is not available
SSD	640	32-bit list data, 160 events at maximum

SV, AZ, TOF, and PH indicate the sweeping voltage, azimuthal angle, time-of-flight, and pulse height, corresponding to the E/q, incident direction, m/q, and E, respectively. The 32-bit list data contains the values of SV (4 bits), AZ (4 bits), TOF (9 bits), and PH (10 bits)