ELECTROSPRAY THRUSTERS Electrospray thrusters are characterized by precise thrust control (on the order of nano-Newtons) and extremely efficient operation (over 80%).    LISA PATHFINDER - SPACE TECHNOLOGY 7 Since 1998, Busek has been a recognized leader in the field of electrospray physics,  which led to the Jet Propulsion Laboratory’s award to Busek to develop the first  electrospray thruster system.  This system included custom power management, digital  control interface and propellant storage and management systems. The extreme  precision (equivalent to the weight of a mosquito antenna) required the development of  new miniature valves capable of withstanding the performance requirements, in addition  to a propellant-less carbon nanotube cathode.  Since delivering the flight hardware to  JPL in 2008, Busek has been continuing its effort to result in a new class of miniature,  high performance electrospray propulsion.
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The module consumes 1 U (including electronics) and 15 W power to  deliver a thrust range up to 1.0mN, at specific impulses ranging from  400 s to over 1300 s. The in-situ optimization of performance  provides significant mission flexibility and versatility. The Electrospray  Thruster System features a precision microvalve leveraged from ST7  design heritage and rugged flight electronics.  100µN ELECTROSPRAY THRUSTER SYSTEM Busek's 100µN-Class Electrospray Propulsion System is a 9 cm x 9 cm x3.2 cm module and consumes 5.5 W to deliver 0.1 mN at a specific  impulse of 2,300 seconds. Lower specific impulse configurations are  available for extremely power limited applications (<3.5 W). A single  module can deliver 74 m/s to a 4kg CubeSat. 
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