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Title: Isotopic effect in experiments on lower hybrid current drive in the FT-2 tokamak

To analyze factors influencing the limiting value of the plasma density at which lower hybrid (LH) current drive terminates, the isotopic factor (the difference in the LH resonance densities in hydrogen and deuterium plasmas) was used for the first time in experiments carried out at the FT-2 tokamak. It is experimentally found that the efficiency of LH current drive in deuterium plasma is appreciably higher than that in hydrogen plasma. The significant role of the parametric decay of the LH pumping wave, which hampers the use of the LH range of RF waves for current drive at high plasma densities, is confirmed. It is demonstrated that the parameters characterizing LH current drive agree well with the earlier results obtained at large tokamaks.
Authors:
; ; ; ; ; ; ; ; ; ;  [1] ;  [2]
  1. Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation)
  2. St. Petersburg State Technical University (Russian Federation)
Publication Date:
OSTI Identifier:
22472016
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 41; Journal Issue: 12; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DEUTERIUM; EFFICIENCY; ELECTRIC CURRENTS; FT TOKAMAK; HYDROGEN; LIMITING VALUES; LOWER HYBRID CURRENT DRIVE; LOWER HYBRID HEATING; PLASMA DENSITY; PUMPING; RESONANCE