Oral Presentation

High-energy Electron exPeriments (HEP) onboard ERG satellite

Author(s): T. MITANI, T. Takashima (ISAS/JAXA), S. Kasahara (Univ. of Tokyo), W. Miyake (Tokai Univ.), M. Hirahara (Nagoya Univ.)

Presenter: Takefumi Mitani (ISAS/JAXA)

“High energy Electron exPeriments (HEP)” onboard the ERG satellite observes 70 keV - 2 MeV electrons and provides three-dimensional velocity distribution of electrons every spacecraft spin period. Electrons are observed by two types of camera designs, HEP-L and HEP-H, with regard to geometrical factor and energy range. HEP-L observes 0.1 - 1 MeV electrons and its geometrical factor is ~10^{-3} cm^2 str, and HEP-H observes 0.7 - 2 MeV and G-factor is ~10^{-2} cm^2 str. HEP-L and HEP-H each consist of three pin-hole type cameras, and each camera consist of mechanical collimator, stacked silicon semiconductor detectors and readout ASICs. HEP-H has larger opening angle of the collimator and more silicon detectors to observe higher energy electrons than HEP-L.
In this presentation we introduce the HEP instrument design, prelaunch tests results and report the initial results in orbit.