University of SaskatchewanHARVEST
  • Login
  • Submit Your Work
  • About
    • About HARVEST
    • Guidelines
    • Browse
      • All of HARVEST
      • Communities & Collections
      • By Issue Date
      • Authors
      • Titles
      • Subjects
      • This Collection
      • By Issue Date
      • Authors
      • Titles
      • Subjects
    • My Account
      • Login
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      View Item 
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item

      Edge Ion Temperature Measurement in the STOR-M Tokamak

      Thumbnail
      View/Open
      HTHU-THESIS.pdf (3.431Mb)
      Date
      2012-07-26
      Author
      Hthu, Kyaw Minn
      Type
      Thesis
      Degree Level
      Masters
      Metadata
      Show full item record
      Abstract
      A newly developed bidirectional Retarding Field Energy Analyzer, RFEA, which measures ion temperatures from both sides (downstream and upstream), was commissioned in the STOR-M tokamak. Its entrance slit width follows one of the design criteria, < 2 lambda_{De}. The dimension of the RFEA is small enough to avoid creating a shadow effect. The probe is the replacement of previous RFEA which measures ion temperature, T_i, from one side only. An external cable used as an antenna parallel to the cables, connected to the collector, is used to suppress noise picked up by the cable. A similar technique was used in the previous RFEA. By operating the probe in standard ramping mode, T_i in the scrape-off layer (SOL) region between 15.5cm and 12cm from the chamber center is measured (minor radius). The probe performs T_i measurement campaign twice with different entrance slits. The entrance slit 1 provides higher collector current than the entrance slit 2, but the entrance slit 1 on the downstream side did not survive during the fi rst T_i campaign. T_i measured by the entrance slit 2 in the SOL region of the STOR-M is between 19eV and 34eV. The probe operation is validated by T_e values simultaneously measured by the Triple probe. T_i/T_e is between 1.8 and 2.8 in the STOR-M SOL. RFEA in DC mode operation demands higher ion current to estimate T_i fluctuation. The 2011 Ti campaign shows that the direction of magnetic fi eld largely affects the current RFEA operation both in conventional ramping mode and in DC mode.
      Degree
      Master of Science (M.Sc.)
      Department
      Physics and Engineering Physics
      Program
      Physics
      Supervisor
      Hirose, Akira
      Committee
      Ghezelbash, Masoud; Smolyakov, Andrei; Gokaraju, Ramakrishna; Koustov, Sasha
      Copyright Date
      July 2012
      URI
      http://hdl.handle.net/10388/ETD-2012-07-499
      Subject
      Retarding Field Energy Analyzer
      RFEA
      RFA
      ion temperature
      T_i
      Ti
      2 lambda_{De}
      electron temperature
      T_e
      Te
      Collections
      • Graduate Theses and Dissertations
      University of Saskatchewan

      University Library

      © University of Saskatchewan
      Contact Us | Disclaimer | Privacy