Background
The project was undertaken to address the limitations in current Energetic Neutral Atom (ENA) imagers, which are crucial for space exploration and other observational scientific endeavors. Traditional ENA imagers, while effective, suffer from constraints in mass resolution, energy range, and versatility in various operational conditions. MEMS (Micro-Electro-Mechanical Systems) technology, specifically MEMS microshutter arrays, present an innovative solution to these limitations. By leveraging advanced microshutter arrays, the project aims to significantly enhance the capability and performance of ENA imagers, providing more precise measurements and broader functionality.
Approach
The primary objective of the project was to explore the development of next-generation ENA imagers using MEMS microshutter arrays to improve mass and energy resolution. The project was broken into three key tasks:
- Simulating MEMS-Based ENA Instruments:
- Conceptual diagrams and simulations of MEMS-based ENA instruments were created to design and optimize microshutter arrays.
- Comparisons between traditional ENA imagers and the proposed MEMS-based designs were conducted to highlight improvements in functionality and resolution.
- Testing MEMS Behavior Performance in Space Conditions:
- Reviving the MEMS testing facility and performing testing campaigns on archived MEMS devices.
- The testing aimed to validate the operation of microshutter arrays under conditions simulating space environments.
- Establishing a New MEMS Procurement Avenue:
- Securing new procurement channels for MEMS devices given the obsolescence of previous sources.
- Collaborations with NASA Goddard Space Flight Center (GSFC) to gain insights and potential partners for MEMS fabrication and development.
Dust simulants were procured to mimic lunar regolith. The primary simulant was the Lunar South Pole high-fidelity simulant (LSP-2), representative of the Artemis-relevant landing sites. Additional tests were performed with LMS-1D simulant to better match MCP pore sizes. Detectors were gradually contaminated by manually transferring controlled amounts of simulant, followed by measurements of detector performance after each contamination step. Both mechanical deposition and limited electrostatic conditions were explored.
Accomplishments
The project has achieved several technical milestones, which include:
- Simulation Success:
- Successful simulations demonstrated that utilizing two microshutter arrays to measure Time-of-Flight (TOF) before particle ionization significantly improves mass resolution compared to traditional methods.
- Revival of Testing Facility:
- The MEMS testing facility was revived and partially operational despite challenges, such as delays in procurement of essential equipment (arbitrary waveform generator).
- Identification of New Procurement Avenue:
- Established communication and potential partnership with Meng-Ping Chang’s team at NASA GSFC for the development of optimized MEMS microshutter arrays.
- Consolidated Future Strategy:
- A strategy was proposed to collaborate with NASA GSFC on a PICASSO (Planetary Instrument Concepts for the Advancement of Solar System Observations) proposal to further advance and develop MEMS-based ENA imagers.
These accomplishments set a strong foundation for future advancements in ENA imaging technology, aiming to provide enhanced tools for space exploration and scientific research.