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- W2078941811 abstract "In the attempt to fill the performance niche between the arcjet and Hall thruster, we propose the use of a helium arcjet to neutralize Hall thrusters. Since the arcjet is a high plasma density device, one arcjet can potentially neutralize a cluster of Hall thrusters. In this preliminary study, we used a surrogate planar anode in the place of a Hall thruster anode to determine the effects of drawing electron current from a low power arcjet plume on the operation and performance of the arcjet. In all tests we are able to draw currents to the surrogate anode that were greater than the arc current. It is found that biasing the surrogate anode does lead to a perturbation in the arcjet discharge voltage, in some cases resulting in a voltage decrease of up to 40%. The helium arcjet exhibits arc voltage instabilities in the same spectral range of the instabilities that are intrinsic in Hall thrusters. We find however, that these arcjet instabilities decreased in strength and in bandwidth when a bias is applied to the anode. The effect of biasing on the overall arcjet performance (e.g., thrust, specific impulse) is still under investigation. However, preliminary studies made using an impact pressure probe confirms that there is little compromise in the arcjet thrust during the current draw. The use of laser-induced fluorescence to measure the velocity of the arcjet plume flowfield during an applied bias was hindered by the finding that the lower energy state of the helium transition used for the LIF measurements was effectively depopulated by the biasing a result supported by optical emission measurements of the plume." @default.
- W2078941811 created "2016-06-24" @default.
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- W2078941811 date "2001-07-08" @default.
- W2078941811 modified "2023-09-27" @default.
- W2078941811 title "High density plasma neutralization of a Hall thruster" @default.
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- W2078941811 doi "https://doi.org/10.2514/6.2001-3352" @default.
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