Ionic Liquid Electrospray Transient Emission Characterization

Schroeder, Madeleine; Bruno, Amelia; Lozano, Paulo

doi:10.2514/6.2022-0037

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…The Laplace component is interpolated from the EHD model. Fragmentation is included at each timestep according to the mean lifetimes of different cluster types as determined in previous work with simulated RPA curves and molecular dynamics results [9,11]. Single particles trajectories are found using the same simulation procedure without including the Poisson field created by other ions in the beam.…”

Section: E N-body Full Beam Simulationmentioning

confidence: 99%

“…Previous work by Coles [1,6] and Miller [7] has investigated the impact of firing voltage, ionic liquid selection, and liquid temperature on the ion beam mass composition and quantified its impacts on propulsive efficiency. Experiments and molecular dynamics simulations have been performed to characterize fragmentation rates of different emitted species as a function of ionic liquid, cluster internal energy, and applied electric field [7][8][9]. N-body simulations that propagate the full ion beam of a single emitter through a realistic electric and potential field have been used to simulate ion beam diagnostics including retarding potential analysis (RPA) curves [10,11], which provide insight on fragmentation events in the sampled beam; most published results sample the beam centerline [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Angular Properties of Ionic Liquid Electrospray Emitters

Schroeder

Cidoncha

Bruno

et al. 2023

AIAA SCITECH 2023 Forum

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The angular distribution of emitted species in electrospray ion beams is not well characterized and can have negative effects on propulsive performance and emitter lifetime. We present an experimental characterization of the angular distribution of emitted species in a single electrospray ion beam as a function of firing voltage using time of flight mass spectrometry. Angular current distributions indicate the central axis of emission varies up to 10 • from the central axis of the emitter tip. Variation in the ion species as a function of angle depends on the firing voltage. Simulations of single particle trajectories indicate that fragmentation of ion clusters results in ion products moving closer to the center of the beam and neutral products spreading up to 47 • depending on how rapid fragmentation occurs. Experimental results are compared to multiscale full-beam simulations of electrospray emission and future use of these simulations to explain angular beam behavior is discussed.

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Section: E N-body Full Beam Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Angular Properties of Ionic Liquid Electrospray Emitters

Schroeder

Cidoncha

Bruno

et al. 2023

AIAA SCITECH 2023 Forum

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Quantification of ionic-liquid ion source beam composition from time-of-flight data

Jia-Richards

2022

Journal of Applied Physics

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Ionic-liquid ion sources produce beams of charged particles through evaporation and acceleration of ions and charged droplets from the surface of an ionic liquid. The composition of the emitted beam can impact the performance of ion sources for various applications such as focused beams for microfabrication and space propulsion. Numerical inference is considered for quantification of the beam composition of an ionic-liquid ion source through determining the current fraction of different species along with providing uncertainty in inferred values. An analysis of previously presented data demonstrates the ability to quantify the presence of ion clusters, including the distinct presence of heavy ion clusters such as heptamers. Quantification of beam composition will be an important technique for quantitative comparison of different time-of-flight data.

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Effect of the cation-to-anion mass ratio of ionic liquid on plume neutralization characteristics for novel electrospray thruster

Han,

He,

Meng

et al. 2024

Plasma Sources Sci. Technol.

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The ionic liquid electrospray thruster (ILET), a promising technology for space electric propulsion, has been gaining attention due to its theoretical capability to operate without an external neutralizer, which is a key component for traditional ion thrusters. Some experiments have shown that cation-to-anion mass ratio significantly affects the self-neutralization of thruster plumes, but further depth research is still needed. Therefore, numerical simulations of ion emission process both in uni-thruster and bi-thruster modes of ILETs are conducted using particle-in-cell method, to investigate the effect of the cation-to-anion mass ratio in ionic liquid on plume neutralization characteristics. In bi-thruster mode, the anions and cations are emitted simultaneously, while in uni-thruster mode, only anions or cations are emitted under the action of electric field force. Plume neutralization characteristics of four ionic liquid propellants, with different cation-to-anion mass ratio, in bi-thruster mode are obtained and compared to the uni-thruster mode. The results show that the plume profile morphology is significantly dependent on operating mode of the thruster and the cation-to-anion mass ratio of ionic liquid. Unlike the circular profile in uni-thruster mode, the plume in bi-thruster mode exhibit distortion with vertical stratification. The contours of the high-potential region in bi-thruster mode also distort, showing stratification and a V-shape, respectively, influenced by the mass ratio. Ion beam neutralization in bi-thruster mode is primarily achieved through the horizontal displacement of anion and cation beams, as well as their interactions. The cation-to-anion mass ratio influences the oscillation effects of the mass center in anion and cation clouds during neutralization, which in turn affects the neutralization effect. Ionic liquids with a significant mass ratio difference between cations and anions necessitate a longer time and greater distance for neutralization under identical conditions. These findings are instrumental for understanding the plume neutralization process and advancing the design of ILETs.

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Ionic Liquid Electrospray Transient Emission Characterization

Cited by 3 publications

References 12 publications

Angular Properties of Ionic Liquid Electrospray Emitters

Angular Properties of Ionic Liquid Electrospray Emitters

Quantification of ionic-liquid ion source beam composition from time-of-flight data

Effect of the cation-to-anion mass ratio of ionic liquid on plume neutralization characteristics for novel electrospray thruster

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