Hall Effect Thruster or Stationary Plasma Thruster (SPT) is a type of advanced ion propulsion system. They work by trapping electrons in a magnetic field and then use the electrons to ionize propellant, efficiently accelerate the ions to produce thrust. At Bellatrix SPT's with 40mN and 90mN thrust output is under development. The developmental process is expected to be completed in second half of 2018.