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Title: Study of runaway electrons using the conditional average sampling method in the Damavand tokamak

Abstract

Some experiments for studying the runaway electron (RE) effects have been performed using the poloidal magnetic probes system installed around the plasma column in the Damavand tokamak. In these experiments, the so-called runaway-dominated discharges were considered in which the main part of the plasma current is carried by REs. The induced magnetic effects on the poloidal pickup coils signals are observed simultaneously with the Parail–Pogutse instability moments for REs and hard X-ray bursts. The output signals of all diagnostic systems enter the data acquisition system with 2 Msample/(s channel) sampling rate. The temporal evolution of the diagnostic signals is analyzed by the conditional average sampling (CAS) technique. The CASed profiles indicate RE collisions with the high-field-side plasma facing components at the instability moments. The investigation has been carried out for two discharge modes—low-toroidal-field (LTF) and high-toroidal-field (HTF) ones—related to both up and down limits of the toroidal magnetic field in the Damavand tokamak and their comparison has shown that the RE confinement is better in HTF discharges.

Authors:
 [1];  [2];  [3];  [2]
  1. University of Isfahan, Department of Nuclear Engineering, Faculty of Advance Sciences and Technologies (Iran, Islamic Republic of)
  2. Nuclear Science and Technology Research Institute, Plasma Physics and Nuclear Fusion Research School (Iran, Islamic Republic of)
  3. University of Isfahan, Department of Physics, Faculty of Science (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22614020
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 43; Journal Issue: 3; Other Information: Copyright (c) 2017 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; DATA ACQUISITION SYSTEMS; ELECTRIC CURRENTS; ELECTRON COLLISIONS; FIRST WALL; HARD X RADIATION; MAGNETIC FIELDS; MAGNETIC PROBES; PLASMA; RUNAWAY ELECTRONS; S CHANNEL; SAMPLING; SIGNALS; TOKAMAK DEVICES

Citation Formats

Pourshahab, B., E-mail: bpourshahab@gmail.com, Sadighzadeh, A., Abdi, M. R., E-mail: r.abdi@phys.ui.ac.ir, and Rasouli, C. Study of runaway electrons using the conditional average sampling method in the Damavand tokamak. United States: N. p., 2017. Web. doi:10.1134/S1063780X17030102.
Pourshahab, B., E-mail: bpourshahab@gmail.com, Sadighzadeh, A., Abdi, M. R., E-mail: r.abdi@phys.ui.ac.ir, & Rasouli, C. Study of runaway electrons using the conditional average sampling method in the Damavand tokamak. United States. doi:10.1134/S1063780X17030102.
Pourshahab, B., E-mail: bpourshahab@gmail.com, Sadighzadeh, A., Abdi, M. R., E-mail: r.abdi@phys.ui.ac.ir, and Rasouli, C. Wed . "Study of runaway electrons using the conditional average sampling method in the Damavand tokamak". United States. doi:10.1134/S1063780X17030102.
@article{osti_22614020,
title = {Study of runaway electrons using the conditional average sampling method in the Damavand tokamak},
author = {Pourshahab, B., E-mail: bpourshahab@gmail.com and Sadighzadeh, A. and Abdi, M. R., E-mail: r.abdi@phys.ui.ac.ir and Rasouli, C.},
abstractNote = {Some experiments for studying the runaway electron (RE) effects have been performed using the poloidal magnetic probes system installed around the plasma column in the Damavand tokamak. In these experiments, the so-called runaway-dominated discharges were considered in which the main part of the plasma current is carried by REs. The induced magnetic effects on the poloidal pickup coils signals are observed simultaneously with the Parail–Pogutse instability moments for REs and hard X-ray bursts. The output signals of all diagnostic systems enter the data acquisition system with 2 Msample/(s channel) sampling rate. The temporal evolution of the diagnostic signals is analyzed by the conditional average sampling (CAS) technique. The CASed profiles indicate RE collisions with the high-field-side plasma facing components at the instability moments. The investigation has been carried out for two discharge modes—low-toroidal-field (LTF) and high-toroidal-field (HTF) ones—related to both up and down limits of the toroidal magnetic field in the Damavand tokamak and their comparison has shown that the RE confinement is better in HTF discharges.},
doi = {10.1134/S1063780X17030102},
journal = {Plasma Physics Reports},
number = 3,
volume = 43,
place = {United States},
year = {Wed Mar 15 00:00:00 EDT 2017},
month = {Wed Mar 15 00:00:00 EDT 2017}
}