Table I. Ion Engine Characteristics Option 1 Option 2 Specific impulse (sec) 13000 5000 Ar+ kinetic energy (keV/Ar+) 3.5 0.5 Ar+ streaming speed (km/sec) 130 50 Current density (amp/cm2) 2.5 x 10-2 2.5 x 10-2 Temperature (°K) ~ 1000* ~ 1000* Beam density (cm ) ~ 1.5 X 1010 ~ 4 x 1010 Beam diameter at exit (cm) 100 100 Beam spread at exit (deg) ~ 10° ~ 10° Number of engines required for SPS/COTV ~ 300 ~ 800 *Kauffman (1974) 6
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