Development of an Interferometer Diagnostic for the Spheromak Turbulent Physics Experiment (STPX)

Jerry D. Clark; J. Titus; A. B. Alexander; E. D. Mezonlin

Development of an Interferometer Diagnostic for the Spheromak Turbulent Physics Experiment (STPX)

Jerry D. Clark
, J. Titus
, A. B. Alexander
, E. D. Mezonlin

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	American English
Journal	American Physical Society, 54th Annual Meeting of the APS Division of Plasma Physics
State	Published - Oct 1 2012

Disciplines

Physical Sciences and Mathematics
Physics

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https://ui.adsabs.harvard.edu/abs/2012APS..DPPTO6012C/abstract

Cite this

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title = "Development of an Interferometer Diagnostic for the Spheromak Turbulent Physics Experiment (STPX)",

abstract = "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.",

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year = "2012",

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journal = "American Physical Society, 54th Annual Meeting of the APS Division of Plasma Physics",

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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 -

Development of an Interferometer Diagnostic for the Spheromak Turbulent Physics Experiment (STPX)

Abstract

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