Improved density profile measurements in the C-2U advanced beam-driven Field-Reversed Configuration (FRC) plasmas

August 2016 | M. Beall | Review of Scientific Instruments | Paper

In the prior C-2 experiment, electron density was measured using a two-color 6-chord CO2/HeNe interferometer. Analysis shows that high-frequency common mode phase noise can be reduced by a factor of 3 by constructing a reference chord.

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Diagnostic suite of the C-2U advanced beam-driven field-reversed configuration plasma experiment

August 2016 | M. C. Thompson | Review of Scientific Instruments | Paper

The C-2U experiment at Tri Alpha Energy studies the evolution of field-reversed configuration (FRC) plasmas sustained by neutral beam injection. Data on the FRC plasma performance are provided by a comprehensive suite of diagnostics that includes magnetic sensors, interferometry, Thomson scattering, spectroscopy, bolometry, reflectometry, neutral particle analyzers, and fusion product detectors.

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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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