| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
This study reports the first ground study to measure the azimuthal velocities of an ion thruster that produces roll torque. Through the operation of ion thrusters in space, it has been confirmed that thrusters cause an unexpected roll torque about the ion beam axis. To reveal the physical mechanism that produces this torque, laser-induced fluorescence spectroscopy was applied to a microwave ion thruster. This technique can be used to measure the azimuthal velocity by estimating the Doppler shift of xenon ions. By deconvolving these spectra, the azimuthal velocities were successfully measured, which was accurately reproduced by the simulated velocity profile obtained using a model including the effects of the misalignment of the grids and the Lorentz force produced by the magnetic field of the discharge chamber. A roll torque of 0.5 μm about the thrust axis was calculated from the velocity profile; this prediction agrees well with the flight data for the spacecraft.
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