Ion sources for space thrusters (invited)

Abstract

One of the main tasks of the creation of spacecraft power plants is raising the thrust producing jet velocity. Conventional chemical engines create jet velocities in the range of 3000–4500 m/s. This situation can be drastically changed if beams of charged particles accelerated by electric and magnetic fields are used to produce thrust. In such cases practically any jet velocity might be created, which considerably enlarges the number of tasks being fulfilled by spacecraft having such types of thruster. Several types of electric propulsion thrusters exist nowadays. They differ in the principles of acceleration of charged particles, for example, arc jets, magnetic plasma dynamic thrusters, stationary plasma thrusters, pulse thrusters, and ion thrusters. Electric propulsion thrusters are practically the accelerators of charged particles which operate under rather strict requirements concerning energy consumption and lifetime. Since the mid-fifties in Russia there have been intensive studies of practically all types of electric propulsion thrusters, including their tests in space, and beginning with the mid-seventies they have been practically used aboard spacecraft with a long, active lifetime. The study of the physical process involved together with the research design allowed Russian scientists to develop electric propulsion thrusters in the power range from hundreds of watts to tens of kilowatts, with jet velocities between 20000 and 50000 m/s and lifetime more than several thousand hours.

Evaluation of compact ECR plasma source for thruster applications

“…There is an increasing number of studies on electric propulsion for satellite control and space missions, where one requires propulsion systems with very high specific impulse (I sp ) [1][2][3][4][5][6][7][8][9]. Electric propulsion systems are not limited by the chemistry of the propellant.…”

A simple hollow probe for monitoring ion-beam energy in processing plasmas

“…The probability of energy transfer to neutral atoms can be raised by a suitable primary electron magnetic containment, so that plasma generation expends a minimum of energy and propellant, thus improving the overall performance of the ion thruster. Grigoryan [12] has reviewed various ion thrusters such as arc jets, magnetic plasma dynamic thrusters, stationary plasma thrusters and pulse thrusters. Recently, microwave electron cyclotron resonance plasma [13] and helicon wave plasma [14] ion sources have been also studied as new candidates for thrusters.…”