Journal article
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(37), 375202
05/22/2023
DOI: 10.1088/1361-6463/acd78f
Appears in UI Libraries Support Open Access
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 µm 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.
Details
- Title: Subtitle
- Controlling the charge of dust particles in a plasma afterglow by timed switching of an electrode voltage
- Creators
- Neeraj Chaubey - University of Iowa, Physics and AstronomyJ Goree - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- Journal of physics. D, Applied physics, Vol.56(37), 375202
- DOI
- 10.1088/1361-6463/acd78f
- ISSN
- 0022-3727
- eISSN
- 1361-6463
- Publisher
- IOP Publishing
- Number of pages
- 9
- Grant note
- PHY-1740379 / National Science Foundation (http://dx.doi.org/10.13039/100000001) DE-SC0014566 / United States Department of Energy RSA No. 1672641; RSA No. 1689926 / NASA/JPL W911NF-18–1-0240 / Army Research Office under MURI
- Language
- English
- Date published
- 05/22/2023
- Academic Unit
- Physics and Astronomy; Mechanical Engineering
- Record Identifier
- 9984440557902771
Metrics
16 Record Views