A polarization-based Thomson scattering technique for burning plasmas

  title={A polarization-based Thomson scattering technique for burning plasmas},
  author={E. Parke and Vladimir V. Mirnov and Daniel J. den Hartog},
  journal={Journal of Instrumentation},
  pages={C02030 - C02030}
The traditional Thomson scattering diagnostic is based on measurement of the wavelength spectrum of scattered light, where electron temperature measurements are inferred from thermal broadening of the spectrum. At sufficiently high temperatures, especially those predicted for ITER and other burning plasmas, relativistic effects cause a change in the degree of polarization (P) of the scattered light; for fully polarized incident laser light, the scattered light becomes partially polarized. The… 

Polarization of incoherent Thomson scattering for electron temperature measurement

This paper reviews the polarization properties of Thomson scattered (TS) light as applied to electron temperature measurement. The theoretical background is based on Stokes vector transformations and

First observation of the depolarization of Thomson scattering radiation by a fusion plasma

We report the first experimental observation of the depolarization of the Thomson scattering (TS) radiation, a relativistic effect expected to occur in very high Te plasmas and never observed so far

Electron kinetic effects on interferometry, polarimetry and Thomson scattering measurements in burning plasmas (invited).

A more precise model with τ(2)-order corrections is presented to satisfy the high accuracy required for ITER TIP and PoPola diagnostics and the possible use of the polarization properties of Thomson scattered light as a method of Te measurement relevant to ITER operational scenarios.

Relativistic electron kinetic effects on laser diagnostics in burning plasmas

Toroidal interferometry/polarimetry (TIP), poloidal polarimetry (PoPola), and Thomson scattering systems (TS) are major optical diagnostics being designed and developed for ITER. Each of them relies

Rotational Raman scattering as a source of polarized radiation for the calibration of polarization-based Thomson scattering

We discuss the use of rotational Raman scattering as a possible technique for the calibration of polarization based plasma diagnostics such as the polarimetric Thomson scattering (TS) systems

Exact relativistic expressions for polarization of incoherent Thomson scattering

We present a derivation of the degree of polarization for incoherent Thomson scattering (TS) using Mueller matrix formalism. An exact analytic solution is obtained for spectrum-integrated matrix

On the calibration of polarimetric Thomson scattering by Raman polarimetry

Polarimetric Thomson scattering (TS) is an alternative method for the analysis of Thomson scattering spectra in which the plasma temperature Te is determined from the depolarization of the TS

Polarimetric Thomson scattering for high Te fusion plasmas

Polarimetric Thomson scattering (TS) is a technique for the analysis of TS spectra in which the electron temperature Te is determined from the depolarization of the scattered radiation, a

A Multiphysics Ray Optics Model for the Propagation of Electromagnetic Waves in Plasmas and the Design of Laser-Based Diagnostics in Nuclear Fusion Reactors

Laser-based methods are widely used techniques for thermonuclear plasma diagnostics, since they can probe the internal of the plasma, being contactless and non-invasive. The interferometer, the



The ITER Thomson scattering core LIDAR diagnostic

The central electron temperature and density of the ITER plasma may be determined by Thomson scattering. A LIDAR topology is proposed in order to minimize the port access required of the ITER vacuum

Electron kinetic effects on optical diagnostics in fusion plasmas

At anticipated high electron temperatures in ITER, the effects of electron thermal motion on Thomson scattering (TS), toroidal interferometer/polarimeter (TIP) and poloidal polarimeter (PoPola)

Construction of electron distribution functions from laser scattering spectra

The Thomson scattering spectrum, for laser light scattered by a low density plasma, is determined by the Doppler shifts from the moving electrons. It is shown how the full three-dimensional

Polarization of radiation in incoherent Thomson scattering by high temperature plasma

The state of polarization of radiation scattered from hot plasma for any given input polarization is obtained by a relativistic derivation. Approximate analytical expressions are obtained for

Plasma Scattering of Electromagnetic Radiation: Theory and Measurement Techniques

This work presents one of the most powerful methods of plasma diagnosis in exquisite detail to guide researchers in the theory and measurement techniques of light scattering in plasmas. Light

Silicon avalanche photodiode detector circuit for Nd:YAG laser scattering

A silicon avalanche photodiode with an internal gain of about 50 to 100 is used in a temperature‐controlled environment to measure the Nd:YAG laser Thomson scattered spectrum in the wavelength range

Analytic formula for fully relativistic Thomson scattering spectrum

A compact formula for fully relativistic Thomson scattering spectrum including depolarization term is presented. By rational approximation, an analytic formula with high accuracy (relative error<0.1%

Zanza, Polarization of radiation in incoherent Thomson scattering by high temperature plasma

  • Phys. Plasmas
  • 2000


A simple relativistic correction to the electron‐ion bremsstrahlung spectrum from a Maxwell‐Boltzmann plasma is reported. The need for, and accuracy of, the correction are briefly noted.


The possibility of determining the plasma electron temperature by measuring the depolarization of the radiation scattered by the high temperature fusion reactor plasma is explored in this article. A