High-sensitivity far-forward collective scattering diagnostic on HL-2A tokamak

Y G Li; Y Li; Y Zhou; H X Wang; J Yi; J Cheng; K Yao; L M Yu; W Chen; Z C Deng; Z B Shi; Yi Liu; Q W Yang

doi:10.1063/1.5082377

High-sensitivity far-forward collective scattering diagnostic on HL-2A tokamak

Rev Sci Instrum. 2019 May;90(5):053502. doi: 10.1063/1.5082377.

Authors

Y G Li¹, Y Li¹, Y Zhou¹, H X Wang¹, J Yi¹, J Cheng¹, K Yao¹, L M Yu¹, W Chen¹, Z C Deng¹, Z B Shi¹, Yi Liu¹, Q W Yang¹

Affiliation

¹ Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.

PMID: 31153266
DOI: 10.1063/1.5082377

Abstract

The multichannel formic acid (HCOOH, λ = 432.5 µm) laser interferometer and Faraday-effect polarimeter on HL-2A tokamak have been developed to measure the far-forward collective scattering from electron density fluctuations. The far-forward collective scattering system provides eight channels of line-integrated electron density fluctuations, covering the wave-number range: k_⊥ < 1.6 cm^-1. With the new diagnostic, the density fluctuations caused by plasma energetic particles and turbulence have been routinely observed in HL-2A experiments.