High sensitivity far infrared laser diagnostics for the C-2U advanced beam-driven field-reversed configuration plasmas

August 2016 | B. H. Deng | Review of Scientific Instruments | Paper

A high sensitivity multi-channel far infrared laser diagnostics with switchable interferometry and polarimetry operation modes for the advanced neutral beam-driven C-2U field-reversed configuration (FRC) plasmas is described. The interferometer achieved superior resolution of 1 ⇥ 1016 m 2 at >1.5 MHz bandwidth, illustrated by measurement of small amplitude high frequency fluctuations.

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Jet outflow and open field line measurements on the C-2U advanced beam-driven field-reversed configuration plasma experiment

August 2016 | D. Sheftman | Review of Scientific Instruments | Paper

Knowledge and control of the axial outflow of plasma particles and energy along open-magnetic-field lines are of crucial importance to the stability and longevity of the advanced beam-driven field- reversed configuration plasma. An overview of the diagnostic methods used to perform measurements on the open field line plasma on C-2U is presented, including passive Doppler impurity spectroscopy, microwave interferometry, and triple Langmuir probe measurements.

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