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Title: Temporal and spatial evolution of runaway electrons at the instability moments in Damavand tokamak

Abstract

The time and position behavior of runaway electrons at the Parail–Pogutse instability moments has been investigated using experimental observations in plasma current, loop voltage, the Hard X-ray (HXR) radiations, and 18 poloidal pickup coils signals received by data acquisition system simultaneously. The conditional average sampling (CAS) method was used to analyze the output data. Moreover, a filament current code was modified to study the runaway electrons beam movement in the event of instabilities. The results display a rapid drift of runaway beam toward the inner wall of the vacuum vessel and the collision with the wall components at the instability moments. The existence of the collisions in these experiments is evident in the HXR bursts which are considered as the main trigger for CAS Analysis. Also, the variation of HXR bursts with the toroidal magnetic field shows that the hard X-ray bursts drop with increase in the toroidal magnetic field and runaway electrons confinement quality.

Authors:
 [1];  [2]; ;  [3]
  1. Department of Nuclear Engineering, Faculty of Advance Sciences and Technologies, University of Isfahan, P.O. Box 81747-73441, Isfahan (Iran, Islamic Republic of)
  2. Department of Physics, Faculty of Science, University of Isfahan, P.O. Box 81747-73441, Isfahan (Iran, Islamic Republic of)
  3. Plasma Physics and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, AEOI, P.O. Box 14155-1339, Tehran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22600072
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COLLISIONS; DATA ACQUISITION; DATA ACQUISITION SYSTEMS; ELECTRIC CURRENTS; ELECTRIC POTENTIAL; ELECTRON BEAMS; FILAMENTS; HARD X RADIATION; MAGNETIC FIELDS; PLASMA; PLASMA INSTABILITY; RUNAWAY ELECTRONS; SIGNALS; TOKAMAK DEVICES; WALLS

Citation Formats

Pourshahab, B., Abdi, M. R., Sadighzadeh, A., and Rasouli, C. Temporal and spatial evolution of runaway electrons at the instability moments in Damavand tokamak. United States: N. p., 2016. Web. doi:10.1063/1.4955218.
Pourshahab, B., Abdi, M. R., Sadighzadeh, A., & Rasouli, C. Temporal and spatial evolution of runaway electrons at the instability moments in Damavand tokamak. United States. doi:10.1063/1.4955218.
Pourshahab, B., Abdi, M. R., Sadighzadeh, A., and Rasouli, C. Fri . "Temporal and spatial evolution of runaway electrons at the instability moments in Damavand tokamak". United States. doi:10.1063/1.4955218.
@article{osti_22600072,
title = {Temporal and spatial evolution of runaway electrons at the instability moments in Damavand tokamak},
author = {Pourshahab, B. and Abdi, M. R. and Sadighzadeh, A. and Rasouli, C.},
abstractNote = {The time and position behavior of runaway electrons at the Parail–Pogutse instability moments has been investigated using experimental observations in plasma current, loop voltage, the Hard X-ray (HXR) radiations, and 18 poloidal pickup coils signals received by data acquisition system simultaneously. The conditional average sampling (CAS) method was used to analyze the output data. Moreover, a filament current code was modified to study the runaway electrons beam movement in the event of instabilities. The results display a rapid drift of runaway beam toward the inner wall of the vacuum vessel and the collision with the wall components at the instability moments. The existence of the collisions in these experiments is evident in the HXR bursts which are considered as the main trigger for CAS Analysis. Also, the variation of HXR bursts with the toroidal magnetic field shows that the hard X-ray bursts drop with increase in the toroidal magnetic field and runaway electrons confinement quality.},
doi = {10.1063/1.4955218},
journal = {Physics of Plasmas},
number = 7,
volume = 23,
place = {United States},
year = {Fri Jul 15 00:00:00 EDT 2016},
month = {Fri Jul 15 00:00:00 EDT 2016}
}