The Low-Energy Neutral Imager (LENI).

Area of Science:

• Space physics
• Plasma physics
• Instrument development

Background:

• Breakthroughs in heliospheric and magnetospheric energetic neutral atom (ENA) imaging necessitate novel instrument designs.
• Existing instruments have provided initial insights into the heliospheric boundary and magnetospheric ENA emissions.
• Understanding suprathermal plasma populations is crucial for characterizing these regions.

Purpose of the Study:

• To present a concept for a high angular resolution ENA imager.
• To enable detailed study of the heliospheric boundary's spatial and temporal structure.
• To characterize magnetospheric ENA emissions from various regions, including the ring current and magnetosheath.

Main Methods:

• The proposed instrument targets suprathermal plasma populations with energies from 0.5 to 20 keV.
• It employs ultrathin carbon foils for ENA detection.
• Utilizes 2-D collimation and a novel electron optical design for enhanced imaging capabilities.

Main Results:

• The concept achieves high angular resolution (≤2°).
• It offers high sensitivity (≥10⁻³ cm² sr/pixel).
• The design is suitable for imaging ENA emissions in the 0.5-20 keV energy range.

Conclusions:

• This new ENA imager concept represents a significant advancement for heliospheric and magnetospheric research.
• It will enhance our understanding of dynamic space plasma environments.
• The instrument is well-suited for future space missions requiring detailed ENA imaging.