TY - JOUR
T1 - Development of an Interferometer Diagnostic for the Spheromak Turbulent Physics Experiment (STPX)
AU - Clark, Jerry D.
AU - Titus, J.
AU - Alexander, A. B.
AU - Mezonlin, E. D.
PY - 2012/10/1
Y1 - 2012/10/1
N2 - Laser interferometry is a proven method for measuring electron density in fusion plasmas. Typically, far-infrared interferometers are used because of the large phase shift due to the change in the index of refraction of the plasma and their relative insensitivity to vibrations. A two-color (CO2: λ=10.6 μm, HeNe: λ=633 nm) interferometer has been designed for installation on STPX. The interferometer is a Mach-Zehnder configuration with a single-chord, double pass probe beam. The laser beams copropagate along a 10-meter path for vibration subtraction along with frequency modulation for heterodyne detection. Detection is carried out using a HgCdTe photoconductor for the CO2 and a Si APD for the HeNe. The capabilities and challenges with the installation of the interferometer on STPX will be discussed.
AB - Laser interferometry is a proven method for measuring electron density in fusion plasmas. Typically, far-infrared interferometers are used because of the large phase shift due to the change in the index of refraction of the plasma and their relative insensitivity to vibrations. A two-color (CO2: λ=10.6 μm, HeNe: λ=633 nm) interferometer has been designed for installation on STPX. The interferometer is a Mach-Zehnder configuration with a single-chord, double pass probe beam. The laser beams copropagate along a 10-meter path for vibration subtraction along with frequency modulation for heterodyne detection. Detection is carried out using a HgCdTe photoconductor for the CO2 and a Si APD for the HeNe. The capabilities and challenges with the installation of the interferometer on STPX will be discussed.
UR - https://corescholar.libraries.wright.edu/physics/1056
UR - https://ui.adsabs.harvard.edu/abs/2012APS..DPPTO6012C/abstract
M3 - Article
JO - American Physical Society, 54th Annual Meeting of the APS Division of Plasma Physics
JF - American Physical Society, 54th Annual Meeting of the APS Division of Plasma Physics
ER -