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The key advantage that T6 HPEPS provides over competitor electrical propulsion systems is lower satellite system mass, enabled through higher fuel efficiency. The T6 HPEPS has a Specific Impulse (SI) twice that of the alternative type of electric propulsion (such as Hall Effect Thrusters (HET)) and more than 10 times that of chemical propulsion so an equivalent HET system would need twice as much propellant as HPEPS.
The HPEPS architecture is presented below.