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Title: Studies on charge variation and waves in dusty plasmas
Researcher: Kausik, Siddhartha Sankar
Guide(s): Saikia, Bipul Kumar
Keywords: Acoustic
University: Gauhati University
Completed Date: 28/02/2007
Abstract: Plasma and dust grains are both ubiquitous ingredients of the universe. The interplay between them has opened up a new and fascinating research domain, that of dusty plasmas, which contain macroscopic particles of solid matter besides the usual plasma constituents. The research in dusty plasmas received a major boost in the early eightics with Voyager spacecraft observation on the formation of Saturn rings. Dusty plasmas are defined as partially or fully-ionized gases that contain micron-sized particles of electrically charged solid material, either dielectric or conducting. The physics of dusty plasmas has recently been studied intensively because of its importance for a number of applications in space and laboratory plasmas. This thesis presents the experimental studies on charge variation and waves in dusty plasmas. The experimental observations are carried out in two different experimental devices. Three different sets of experiments are carried out in two different experimental devices. Three different sets of experiments are carried out to study the dust charge variation in a filament discharge argon plasma. The dust grains used in these experiments are grains of silver. In another get of experiment, dust acoustic waves are studied in a de glow discharge argon plasma. Alumina dust grains are sprinkled in this experiment. The diagnostic tools used in these experiments are Langmuir probe and Faraday cup. The instruments used in these experiments are electrometer, He-Ne laser and charge coupled device (CCD) camera. Langmuir probe is used to measure plasma parameters, while Faraday cup and electrometer are used to measure very low current (~pA) carried by a collimated dust beam. He-Ne laser illuminates the dust grains and CCD camera is used to capture the images of dust acoustic waves. Silver dust grains are produced in the dust chamber by gas-evaporation technique. Due to differential pressure maintained between the dust and plasma chambers, the dust grains move upward in the form of a collimated beam. Argon...
Appears in Departments:Department of Physics

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01_title page.pdfAttached File15.56 kBAdobe PDFView/Open
02_dedicated.pdf7.01 kBAdobe PDFView/Open
03_declaration.pdf13.3 kBAdobe PDFView/Open
04_certificate.pdf15.98 kBAdobe PDFView/Open
05_acknowledgement.pdf114.4 kBAdobe PDFView/Open
06_abstract.pdf85.16 kBAdobe PDFView/Open
07_content.pdf70.84 kBAdobe PDFView/Open
08_list of figures.pdf93.35 kBAdobe PDFView/Open
09_list of tables.pdf14.22 kBAdobe PDFView/Open
10_chapter 1.pdf2.22 MBAdobe PDFView/Open
11_chapter 2.pdf3.14 MBAdobe PDFView/Open
12_chapter 3.pdf1.29 MBAdobe PDFView/Open
13_chapter 4.pdf595.72 kBAdobe PDFView/Open
14_chapter 5.pdf531.06 kBAdobe PDFView/Open
15_chapter 6.pdf1.19 MBAdobe PDFView/Open
16_conclusion and future scope.pdf147.79 kBAdobe PDFView/Open
17_bibliography.pdf150.61 kBAdobe PDFView/Open
18_list of publication.pdf36.65 kBAdobe PDFView/Open

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