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Plasma Physics Reports

, Volume 27, Issue 7, pp 545–548 | Cite as

Behavior of hard X-ray emission in discharges with current disruptions in the DAMAVAND and TVD tokamaks

  • E. Farshi
  • R. Amrollahy
  • A. V. Bortnikov
  • N. N. Brevnov
  • Yu. V. Gott
  • V. A. Shurygin
Tokamaks

Abstract

Results are presented from studies of the behavior of hard X-ray emission in discharges with current disruptions in the DAMAVAND and TVD tokamaks. The current disruptions are caused by either an MHD instability or the instability related to the vertical displacement of the plasma column. Experiments were conducted at a fixed value of the safety factor at the plasma boundary (q a ⋍ 2.3). Experimental data show that, during a disruption caused by an MHD instability, hard X-ray emission is suppressed by this instability if the amplitude of the magnetic field fluctuations exceeds a certain level. If the disruption is caused by the instability related to the vertical displacement of the plasma column, then hard X-ray emission is observed at the instant of disruption. The experimental results show that the physical processes resulting in the generation and suppression of runaway electron beams are almost identical in large and small tokamaks.

Keywords

Experimental Data Magnetic Field Electron Beam Physical Process Vertical Displacement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK "Nauka/Interperiodica" 2001

Authors and Affiliations

  • E. Farshi
    • 1
  • R. Amrollahy
    • 2
  • A. V. Bortnikov
    • 3
  • N. N. Brevnov
    • 3
  • Yu. V. Gott
    • 3
  • V. A. Shurygin
    • 3
  1. 1.Department of Advanced Energy Engineering ScienceKyushu UniversityKasuga, FukuokaJapan
  2. 2.K-N Toosi University of TechnologyTehranIslamic Republic of Iran
  3. 3.Russian Research Centre Kurchatov InstituteMoscowRussia

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