A method is demonstrated for controlling the charge of a dust particle in a plasma afterglow, allowing a wider range of outcomes than an earlier method. As in the earlier method, the dust particles are located near an electrode that has a DC voltage during the afterglow. Here, that DC voltage is switched to a positive value at a specified delay time, instead of maintaining a constant negative voltage as in the earlier method. Adjusting the timing of this switching allows one to control the residual charge gradually over a wide range that includes both negative and positive values of charge. For comparison, only positive residual charges were attained in the earlier method. We were able to adjust the residual charge from about −2000 e to +10 000 e , for our experimental parameters (8.35 µ m particles, 8 mTorr argon pressure, and a DC voltage that was switched from −150 V to +125 V within the first two milliseconds of the afterglow). The plasma conditions near the dust particles changed from ion-rich to electron-rich, when the electrode was switched from cathodic to anodic. Making this change at a specified time, as the electrons and ions decay in the afterglow, provides this control capability. These results also give insight into the time development of a dust particle’s charge in the afterglow, on a sub-millisecond time scale.
Chaubey, Neeraj and Goree, J.. "Controlling the charge of dust particles in a plasma afterglow by timed switching of an electrode voltage." Journal of Physics. D, Applied Physics, vol. 56, no. 37, Jun. 2023. https://doi.org/10.1088/1361-6463/acd78f
Chaubey, Neeraj, & Goree, J. (2023). Controlling the charge of dust particles in a plasma afterglow by timed switching of an electrode voltage. Journal of Physics. D, Applied Physics, 56(37). https://doi.org/10.1088/1361-6463/acd78f
Chaubey, Neeraj, and Goree, J., "Controlling the charge of dust particles in a plasma afterglow by timed switching of an electrode voltage," Journal of Physics. D, Applied Physics 56, no. 37 (2023), https://doi.org/10.1088/1361-6463/acd78f
@article{osti_1984906,
author = {Chaubey, Neeraj and Goree, J.},
title = {Controlling the charge of dust particles in a plasma afterglow by timed switching of an electrode voltage},
annote = {Abstract A method is demonstrated for controlling the charge of a dust particle in a plasma afterglow, allowing a wider range of outcomes than an earlier method. As in the earlier method, the dust particles are located near an electrode that has a DC voltage during the afterglow. Here, that DC voltage is switched to a positive value at a specified delay time, instead of maintaining a constant negative voltage as in the earlier method. Adjusting the timing of this switching allows one to control the residual charge gradually over a wide range that includes both negative and positive values of charge. For comparison, only positive residual charges were attained in the earlier method. We were able to adjust the residual charge from about −2000 e to +10 000 e , for our experimental parameters (8.35 µ m particles, 8 mTorr argon pressure, and a DC voltage that was switched from −150 V to +125 V within the first two milliseconds of the afterglow). The plasma conditions near the dust particles changed from ion-rich to electron-rich, when the electrode was switched from cathodic to anodic. Making this change at a specified time, as the electrons and ions decay in the afterglow, provides this control capability. These results also give insight into the time development of a dust particle’s charge in the afterglow, on a sub-millisecond time scale. },
doi = {10.1088/1361-6463/acd78f},
url = {https://www.osti.gov/biblio/1984906},
journal = {Journal of Physics. D, Applied Physics},
issn = {ISSN 0022-3727},
number = {37},
volume = {56},
place = {United Kingdom},
publisher = {IOP Publishing},
year = {2023},
month = {06}}
INTERNATIONAL CONFERENCE FOR SCIENCE EDUCATORS AND TEACHERS (ISET) 2017: Proceedings of the 5th International Conference for Science Educators and Teachers (ISET) 2017, AIP Conference Proceedingshttps://doi.org/10.1063/1.5020409