2026-09-20T09:59:51Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/544652022-01-13T07:54:37Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Dennis Whyte.
Thome, Kathreen Elizabeth
Massachusetts Institute of Technology. Dept. of Nuclear Science and Engineering.
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
2010-04-28T15:36:36Z
2010-04-28T15:36:36Z
2009
http://hdl.handle.net/1721.1/54465
554702791
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2009.
"June 2009." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 38).
The plasma potential of the scrape-off-layer (SOL) in the tokamak is a key indicator of the erosion rate of the plasma facing component (PFC) material. The Alcator C-Mod SOL plasma potential is currently measured by emissive probes, which is an established potential diagnostic, yet the probes are fragile and short-lived. The ion-sensitive probe (ISP) is a possible sturdier replacement for the emissive probe. Plasma potentials in the Dionisos plasma chamber (DPC) are compared between the two probe types. Preliminary results show the DPC electron density in helicon mode was found to imitate that of the C-Mod plasma SOL. The ISP plasma potential followed the same trend as the emissive probe plasma potential with RF power level, and the two potentials were always within the error of one another. These results indicated the ISP appears to be appropriate for use in C-Mod.
by Kathreen Elizabeth Thome.
S.B.
39 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
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http://dspace.mit.edu/handle/1721.1/7582
Nuclear Science and Engineering.
Studies of plasma potential measurements using an ion-sensistive probe
Thesis
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<Abstract>The plasma potential of the scrape-off-layer (SOL) in the tokamak is a key indicator of the erosion rate of the plasma facing component (PFC) material. The Alcator C-Mod SOL plasma potential is currently measured by emissive probes, which is an established potential diagnostic, yet the probes are fragile and short-lived. The ion-sensitive probe (ISP) is a possible sturdier replacement for the emissive probe. Plasma potentials in the Dionisos plasma chamber (DPC) are compared between the two probe types. Preliminary results show the DPC electron density in helicon mode was found to imitate that of the C-Mod plasma SOL. The ISP plasma potential followed the same trend as the emissive probe plasma potential with RF power level, and the two potentials were always within the error of one another. These results indicated the ISP appears to be appropriate for use in C-Mod.</Abstract>
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