MPPE-HEP-e

Mercury Plasma Particle Experiments - High-Energy Particle instrument for electron (HEP-e)

Measurement Principle

High-Energy Particle instrument for electrons, one of the MPPE sensors, measures energy spectra of high-energy electrons from 30 up to 700 keV to study plasma acceleration and transport in Mercury’s magnetosphere and coupling between magnetosphere and exosphere. It consists of Single-sided silicon strip Solid-State Detector and ASIC (SSSD-ASIC), front-end processing board, and high-voltage supply unit.

Members

Principal Investigator
Masafumi Hirahara (Nagoya University, Japan)
Manufactures
Meisei Electric Co., Ltd. (Japan)
Mitsubishi Heavy Industries, Ltd. (Japan)
Hamamatsu Photonics K.K. (Japan)

Instrument Specifications

Field of view (18 deg × 57 deg)×2
Angular resolution 18 deg × 12 deg
Energy range 30–700 keV
Energy resolution 20 keV (≤20 ∘C)
ΔE/E = 50%
Time resolution 4 s (1spin) (normal mode)
100 ms (burst mode)
Geometrical factor 0.036 cm2sr
Mass 0.27 kg
Power 3.04 W
Dimensions 82 mm × 134 mm × 115 mm
Data rate 0.0064 kbits/s (L-mode)
1.3 kbits/s (M-mode)
5.1 kbits/s (H-mode)