@article{oai:iwate-u.repo.nii.ac.jp:00010095, author = {Lafleur, T and Takahashi, K and Charles, C and Boswell, R. W.}, issue = {8}, journal = {Physics of Plasmas}, month = {Jan}, note = {It is shown analytically that the thrust from a simple plasma thruster (in the absence of a magnetic field) is given by the maximum upstream electron pressure, even if the plasma diverges downstream. Direct thrust measurements of a thruster are then performed using a pendulum thrust balance and a laser displacement sensor. A maximum thrust of about 2 mN is obtained at 700 W for a thruster length of 17.5 cm and a flow rate of 0.9 mg s−1, while a larger thrust of 4 mN is obtained at a similar power for a length of 9.5 cm and a flow rate of 1.65 mg s−1. The measured thrusts are in good agreement with the maximum upstream electron pressure found from measurements of the plasma parameters and in fair agreement with a simple global approach used to model the thruster.}, pages = {080701-1--080701-4}, title = {Direct thrust measurements and modelling of a radio-frequency expanding plasma thruster}, volume = {18}, year = {2011} }