Two-chord interferometry using 3.39 µm He-Ne laser on a flux-coil-generated FRC.
Rev Sci Instrum
; 81(10): 10D512, 2010 Oct.
Article
en En
| MEDLINE
| ID: mdl-21033867
A two-chord λ(IR)â¼3.39 µm He-Ne laser interferometer system was developed for a flux-coil-generated field-reversed configuration to estimate the electron density and the total temperature of the field-reversed configuration (FRC) plasma. This two-chord heterodyne interferometer system consists of a single â¼2 mW infrared He-Ne laser, a visible (λ(vis)â¼632.8 nm) He-Ne laser for the alignment, a 40 MHz acousto-optic modulator, photodetectors, and quadrature phase detectors. Initial measurement was performed and the measured average electron densities were 2-10×10(19) m(-3) at two different radial positions in the midplane. A time shift in density was observed as the FRC expands radially. The time evolution of the line-averaged density agrees with the density estimated from the in situ internal magnetic probes, based on a rigid-rotor profile model.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Rev Sci Instrum
Año:
2010
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Estados Unidos