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JFT-2M Project | Study of Improved Confinement

Update：2018年12月26日更新
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 JFT-2M plasma

Study of Improved Confinement

Heavy Ion Beam Prove : Collaboration with NIFS

Measurement Principle
  • Injecting heavy ion beam (Tl+ : Max 500keV) into Tokamak
  • By measuring the ionized Tl2+ beam energy and its intensity,
    (1) Potential inside Plasma
    (2) Density Fluctuation
    are evaluated.
  • Highest time resolution is 1μsec
 Electric Field, Fluctuation and Transport Barrier Electric Field and Fluctuation is measured simultaneously
  • (1) Causality between the formation of electric field and transport barrier
    (2) Study the relation among fluctuation, electric field and transport barrier
    (3) Try to measure current density profile from evaluating the toroidal bending angle of the secondary beam
(1) Potential Profile

potential Profile

 Diagnostic System
  • Beam Source
  • Electric Field for beam transport
  • Energy Analyzer

Diagnostic System

(2) Density Fluctuation Ionization is mainly depending on the density
Downward arrow
The density fluctuation is evaluated from the fluctuation of the secondary beam intensity
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