A single-probe-beam double-heterodyne polarimeter-interferometer for plasma Faraday rotation measurements

Faraday rotation measurements on compact helical system by using a phase sensitive heterodyne polarimeter

A phase sensitive heterodyne polarimeter was installed on compact helical system ~CHS!. An HCN laser ~337 mm! and Schottky barrier diodes are used for the radiation source and for detection, respectively. By using a phase sensitive heterodyne scheme, the Faraday rotation angle can be measured from the phase variations caused by the phase difference between the rightand left-handed waves in the ...

Quadrature pslarimetry for plasma Faraday rotation measurements

1,+2.6XlO-“~X,2 I Ln,B,, dl. 0) rl in-phase components of the polarization angle modulation $. The method is insensitive to laser power variations and path length changes in the probe beam optical circuit and is robust to plasma refractive beam bending. Using a local oscillator derived from the Faraday rotated beam itself, the signals obtained at the two output ports can also be made proportion...

CO2 laser polarimeter for Faraday rotation measurements in the DIII-D tokamak.

A tangential viewing, 10.59 microm CO(2) laser polarimeter for electron density measurements based on plasma induced Faraday rotation has been installed on DIII-D. The system uses colinear right- and left-hand circularly polarized beams with a difference frequency of 40 MHz to generate the necessary signal for heterodyne phase detection. The high-resolution phase information required to adequat...

A three-dimensional Gaussian-beam ray-tracing program for designing interferometer/polarimeter plasma diagnostics

Two Point Correlation Technique for the Measurements of Poloidal Plasma Rotation by Heavy Ion Beam Probe∗)

The paper proposes a method to measure poloidal rotation velocity of toroidal plasma vpol using Heavy Ion Beam Probe (HIBP) with a multi-slit energy analyzer. The method is based on calculation of phase shift between broadband density turbulence measured simultaneously in two sample volumes, located at the same magnetic surface but separated poloidally. Oscillatory component of HIBP beam curren...