Antenna decoupling requirements in a gyrotron collective Thomson scattering diagnostic (CTS)

F. Orsitto, U. Tartari

Research output: Contribution to journalArticle


The required rejection ratio of the stray light in a CTS, respect to the launching power is investigated, for obtaining useful signal-to-noise ratio. This problem is faced considering the central gyrotron frequency f0, as well as the in-band stray light raising from the spurious mode of the gyrotron and amplified cyclotron emission (the so-called gyrotron noise), falling into the scattered light spectrum. The statistical nature of the gyrotron noise in the scattering band is important because the required decoupling is obtained using the S/N formula where the fluctuation of the plasma radiation and the gyrotron noise fluctuation appears. It turns out that the total decoupling required at f0is of the order of or greater than 80 dB, while in the scattering band could be less than 40 dB. © 1995 American Institute of Physics.
Original languageEnglish
Pages (from-to)1159 - 1162
Number of pages4
JournalReview of Scientific Instruments
Issue number2
Publication statusPublished - 1995
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Instrumentation

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