Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session JP11: Poster Session IV: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
BEAMS: Laser Accelerators
Education, Public Engagement, and DEI
High School and Undergraduate Research
2:00 PM - 5:00 PM
Tuesday, October 18, 2022
Room: Exhibit Hall A and Online
Abstract: JP11.00098 : Controlling the charge on dust particles using UV photo discharging*
Presenter:
Edward Cowles
(Auburn University)
Authors:
Edward Cowles
(Auburn University)
Michael McKinley
(Auburn University)
Saikat Chakraborty Thakur
(Auburn University)
Edward Thomas
(Auburn University)
Dusty plasma is a four-component plasma consisting of electrons, ions, neutral gas, and microparticles (dust) which collect charge from the surrounding plasma environment. Controlling the charge on the dust particles has both academic and industrial applications. Previous research at Auburn University have shown that the charge on lanthanum hexaboride (LaB6) dust grains, suspended in a DC plasma, can be changed when exposed to an external UV source. However, due to the extremely asymmetric shapes and large size distribution of the LaB6 particles, the motion of some of the particles were stochastic and not fully under control. Hence, a new experiment, with both DC and RF plasma sources, is designed to broaden the former research by looking at different dust particles, such as melamine formaldehyde (MF) which have more uniform shape and size distributions. We shall show results from both MF and LaB6 particles, tested in both DC and RF generated plasmas over a large range of plasma source parameters such as input power and neutral gas pressure. In future, we also hope to study the effects of external magnetic field on this phenomenon.
*This work is supported with funding from the US Dept. of Energy and the NSF-EPSCoR Program.
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