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Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Retarding field analyzer for the EAST plasma boundary.

Y L Li1, G S Xu1, C Xiao1

  • 1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.

The Review of Scientific Instruments
|January 3, 2017
PubMed
Summary

A new bi-directional Retarding Field Analyzer (RFA) probe on the Experimental Advanced Superconducting Tokamak (EAST) measures ion temperature and fast electron fluxes. This advanced diagnostic tool also characterized fast electrons during plasma instabilities like edge localized modes (ELMs).

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Diagnostic Techniques

Background:

  • Understanding plasma behavior in fusion devices like tokamaks is crucial for achieving controlled nuclear fusion.
  • Fast electron populations significantly influence plasma stability and energy transport.
  • Edge localized modes (ELMs) are important plasma phenomena in tokamaks that require detailed study.

Purpose of the Study:

  • To introduce and validate a novel bi-directional Retarding Field Analyzer (RFA) probe system on the EAST tokamak.
  • To measure ion temperature and fast electron fluxes in the EAST plasma.
  • To investigate the characteristics of fast electrons during lower hybrid current drive and edge localized modes (ELMs).

Main Methods:

  • Installation of a bi-directional Retarding Field Analyzer (RFA) probe on a fast reciprocating drive system.
  • Integration of a Langmuir probe assembly for precise positioning and additional plasma measurements (electron density and temperature).
  • Utilizing the RFA and Langmuir probe system to collect data during specific EAST operational phases, including lower hybrid current drive and ELMs.

Main Results:

  • Successful measurement of ion temperature and fast electron fluxes from both ion and electron drift sides during lower hybrid current drive.
  • Demonstration of the RFA probe's capability to detect and quantify fast electrons associated with edge localized modes (ELMs).
  • Indication of substantial fast electron presence in the scrape-off-layer plasma of the EAST tokamak.

Conclusions:

  • The novel bi-directional RFA probe system is an effective diagnostic for measuring ion temperature and fast electron fluxes in tokamaks.
  • The RFA probe provides valuable insights into fast electron dynamics during various plasma conditions, including current drive and ELMs.
  • Fast electrons play a significant role in the scrape-off-layer plasma of the EAST tokamak, particularly during ELMs.