University of Illinois Urbana-Champaign

Chemical sputtering studies of lithiated ATJ graphite

Raman, Priya

Content Files
Priya_Raman.pdf

Permalink

https://hdl.handle.net/2142/42432

Description

Title
Chemical sputtering studies of lithiated ATJ graphite
Author(s)
Raman, Priya
Issue Date
2013-02-03T19:45:26Z
Director of Research (if dissertation) or Advisor (if thesis)
Ruzic, David N.
Department of Study
Nuclear, Plasma, & Rad Engr
Discipline
Nuclear, Plasma, Radiolgc Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2013-02-03T19:45:26Z
Keyword(s)
  • ATJ graphite
  • Lithium
  • Chemical sputtering
  • Chemical erosion
Abstract
Plasma Facing Component (PFC) materials are crucial to fusion reactor development. There is no one material that functions as an ideal PFC material. As a result, coatings are applied to control the interaction between plasmas and the PFC material. Lithium wall conditioning treatments in the National Spherical Torus Experiment have shown dramatic improvements in plasma performance. In order to understand the complex system of lithiated ATJ graphite, chemical sputtering measurements of plain and lithiated ATJ graphite have been conducted in IIAX (Ion-surface InterAction eXperiment) facility. Chemical sputtering of graphite is dependent on the ion energy and substrate temperature, hence the total effects of treating ATJ graphite with lithium in hydrogen plasma are investigated in terms of different target temperatures and bias voltages. The dominant chemical sputtering product is Methane (CH4). It was found that lithium treatments have suppressed the chemical sputtering of ATJ graphite. The suppression of chemical sputtering effect as function of varying lithium thickness on ATJ graphite has been thoroughly studied. The experimental data suggests that the thickness of the lithium has to be greater than the surface roughness of the ATJ graphite to see substantial suppression in chemical sputtering.
Graduation Semester
2012-12
Permalink
http://hdl.handle.net/2142/42432
Copyright and License Information
Copyright 2012 Priya Raman

Owning Collections

Graduate Dissertations and Theses at Illinois PRIMARY
Graduate Theses and Dissertations at Illinois
Dissertations and Theses - Nuclear, Plasma, and Radiological Engineering