Japanese

Low-Energy Particle Experiments - Electron Analyzer; LEP-e

LEP-e

Measurement Principle

Low-Energy Particle Experiments - Electron Analyzer (LEPe) onboard the ERG spacecraft measures three-dimensional distribution functions of low energy electrons. The LEPe instrument consists of a tophat-type electrostatic analyzer, multi-channel plates (MCP), high-voltage power supplies and power supply units. The analyzer selects energies of electrons from ~19 eV to 19 keV in 32 energy steps. LEPe has a fan-shaped field of views, which changes its direction by spin motion to measure in 16 spin-phase directions.

Members

Principal Investigator
Paul Ho (Academia Sinica, Taiwan)
Project Manager
Shiang-Yu Wang (Academia Sinica, Taiwan)
Project Scientist
Sunny W. Y. Tam (National Cheng Kung University, Taiwan)
Project Engineer
Yoichi Kazama (Academia Sinica, Taiwan)
Engineer
Bo-Jhou Wang (Academia Sinica, Taiwan)
Support Scientist
Tzu-Fang Chang (National Cheng Kung University, Taiwan)
Chih-Yu Chiang (National Cheng Kung University, Taiwan)

Instrument Specifications

Parameter Unit Remark
Dimension
upper part 180DIA x 200H mm
lower part 170D x 180W x 90H mm
Mass 5.512 kg
Power consumption 8.8 W 44V*0.20A, incl. PSU’s efficiency
Raw data production 24.6 kbyte/spin Science data, w/o compression
G-factor w/o mesh
Coarse ch 9.34e-4 cm2 sr keV/keV Average, measured
Fine ch 2.15e-4 cm2 sr keV/keV Average, measured
Energy range ~19 - 19,000 eV @4kV HV
Energy resolution 9.2 % FWHM, measured
Field of views 2.98 x ~270 deg Science data, w/o compression
Angular resolution
Coarse ch 2.89 x 21.5 deg EL x AZ, FWHM, measured
Fine ch 3.05 x 4.71 deg EL x AZ, FWHM, measured

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About this page

The ERG (Exploration of energization and Radiation in Geospace) project is a mission to elucidate acceleration and loss mechanisms of relativistic electrons around Earth during geospace storms. The project consists of the satellite observation team, the ground-based network observation team, and the integrated data analysis/simulation team.

The ERG Science Center is operated by Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA) and Institute for Space-Earth Environmental Research (ISEE), Nagoya University as a Joint Research Center for Space Science. The science center archives data related to the ERG project, releases the data to the public, develops integrated analysis tools for the data, and promotes studies related to the ERG  project.

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