Investigations of the plasma conditions in the sheath using dust grain as probes.

Ashrafi, Khandaker Sharmin, 1986-

Investigations of the plasma conditions in the sheath using dust grain as probes.

dc.contributor.advisor	Matthews, Lorin Swint.
dc.creator	Ashrafi, Khandaker Sharmin, 1986-
dc.date.accessioned	2021-01-28T15:36:42Z
dc.date.available	2021-01-28T15:36:42Z
dc.date.created	2020-12
dc.date.issued	2020-11-03
dc.date.submitted	December 2020
dc.date.updated	2021-01-28T15:36:42Z
dc.description.abstract	Dust particles can be levitated against gravity in the sheath of the plasma, and different types of ordered structures can be formed by adjusting the pressure and power of the system. To explain the formation and stability of the ordered structures, it is important to know the plasma parameters such as temperature and number densities of the plasma species, the charges on dust particles, electric fields that accelerate the particles, the ion wake field formed downstream of the dust grains, as well as the ion flow velocities. The main focus of this dissertation is to determine these quantities that are difficult to measure experimentally. In a dusty plasma experiment, the dust grains themselves can be used as probes to measure plasma parameters as the perturbations produce by the grains are minimal. In this study, a molecular dynamics simulation of ion and dust dynamics is used to probe the plasma characteristics. The simulation allows calculation of the charges collected by the dust particles, including the effects of ion-neutral collisions. The model is used to investigate the variations in the electron and ion density within the sheath region. The results obtained from this study agree with the previous numerical and experimental studies, and also allow the ion flow velocities to be determined. The potential structure around the dust grains that is responsible for the attraction between the same polarity charged dust grains is also resolved using this model.
dc.format.mimetype	application/pdf
dc.identifier.uri	https://hdl.handle.net/2104/11195
dc.language.iso	en
dc.rights.accessrights	Worldwide access.
dc.rights.accessrights	Access changed 5/23/23.
dc.subject	Dusty plasma. Plasma conditions. Sheath region. Dust grains as probes. Grain charging. DRIAD. Ion wake field. Ion flow velocities.
dc.title	Investigations of the plasma conditions in the sheath using dust grain as probes.
dc.type	Thesis
dc.type.material	text
local.embargo.lift	2022-12-01
local.embargo.terms	2022-12-01
thesis.degree.department	Baylor University. Dept. of Physics.
thesis.degree.grantor	Baylor University
thesis.degree.level	Doctoral
thesis.degree.name	Ph.D.