PULSED PLASMA THRUSTERS Busek’s micro-Pulsed Plasma Thrusters (μPPTs) have been in development since 2002 based upon  technology originally developed at AFRL. These simple units feature no moving parts and non-toxic Teflon  propellant. Each unit contains all the necessary electronics (PPU/DCIU), requiring only power and command  input from the host spacecraft. Smaller, more advanced units are in active development for CubeSat propulsion systems.  Generally, these thrusters offer the following benefits: Low jitter precision manoeuvres Non-toxic solid Teflon propellant No moving parts, no pressurized containers Long storage life Large temperature range μPPT-1 (MPACS) Four 3-axis μPPTs, or MPACS (Micro Propulsion Attitude Control System), have successfully flown on  FalconSat-3 (launched 2007).  These thruster clusters, pictured at right, feature the following Precise, pulsed impulse bits (80μN-s) Direct flight heritage Solid propellant – no pressurized containers, no moving parts Low power: < 10W μPPT-2 A multiplexed array of 9 μPPTs was constructed and delivered to the Air Force Institute of Technology as a lab- model test unit.  This unit featured flight heritage μPPTs technology, increased the amount of total impulse of  the MPACS unit while decreasing required power and digital electronics.  BmP-220 The latest generation of the μPPT family consumes less than 7.5W, 0.5kg and provides both primary and  attitude control propulsion for CubeSats.  This unit fits within a 10 x 10 x 7cm volume and includes all  necessary power, charging, and digital interface electronics.  Total impulse is 220 N-s.
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