1. SPACE PROPULSION SYSTEM

1. Space Electric Propulsion System
   - Hall Thruster System (> 5 kW class)
   - Ion Thruster System
   - Low-power Electric Thrusters
   - Atmosphere-Breathing Electric Propulsion
2. Space Chemical Propulsion System
   - Mono/Bi/Green Propellant Thrusters
3. Thruster Performance Analysis
   - Thrust Measurement System
   - Ion Beam Analysis

2. PLASMA AND ION BEAM SOURCE

1. Plasma Ion Beam Source R&D
   - Ion Beam Source Development
   - Ion Beam Characteristics Measurement and Diagnostics
2. Plasma Diagnostics
   - Plasma Plume Diagnostics
   - Low-Temperature Plasma Diagnostics
   

3. SPACE ENVIRONMENT

1. Vacuum System R&D
   - Electric Propulsion Vacuum Facility R&D
   - Pressure Effects on Plasma and Plume
   - High Vacuum Facility R&D