Plasma Physics Seminar (309 VAN) - Neeraj Chaubey, PhD; University of Iowa

May 1, 2023

01:30 PM - 02:30 PM

Van Allen Hall, 309

30 North Dubuque Street, Iowa City, IA 52242

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Dr. Neeraj Chaubey

Controlled charging of dust particles in a plasma afterglow

Neeraj Chaubey, PhD; University of Iowa

Afterglow plasma is a short-lived plasma that remains in the chamber after turning off the plasma power. Electrons and ions are lost to the chamber boundaries on different time scales. This difference in time scales can be exploited to control the charge of the dust particles. In this presentation, I will describe an experimental study of controlled dust particle charging by timed switching of the electrode voltage from cathodic to anodic. Depending on the timing of this switching, the dust particles were immersed in conditions that were rich in either electrons or ions. Accordingly, we were able to charge the dust particles either negatively or positively. 

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