Two-chord interferometry using a pin switch for plasma density measurement

Takuma Yamada, Akira Ejiri, Syu N.Ichi Shiraiwa, Yuichi Takase

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Microwave interferometry is a useful diagnostic for measuring the line-integrated density of plasmas. To obtain a detailed profile of the electron density, multi chord interferometry is indispensable. Using a pin switch, we have successfully measured the density along two chords by alternating the beam with a time interval of 2 μs for each chord. This method is very cost advantageous, because it requires only one set of sources and detection components. The system has been applied to Tokyo Spherical Tokamak-2 (TST-2) to measure two vertical chords at different major radii. It is shown that from the densities measured along the two chords, profile changes can be deduced.

Original languageEnglish
Pages (from-to)7083-7084
Number of pages2
JournalJapanese Journal of Applied Physics
Issue number12
Publication statusPublished - Dec 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


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