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Title: Suprathermal electron studies in the TCV tokamak: Design of a tomographic hard-x-ray spectrometer

Abstract

Electron cyclotron resonance heating and electron cyclotron current drive, disruptive events, and sawtooth activity are all known to produce suprathermal electrons in fusion devices, motivating increasingly detailed studies of the generation and dynamics of this suprathermal population. Measurements have been performed in the past years in the tokamak a configuration variable (TCV) tokamak using a single pinhole hard-x-ray (HXR) camera and electron-cyclotron-emission radiometers, leading, in particular, to the identification of the crucial role of spatial transport in the physics of ECCD. The observation of a poloidal asymmetry in the emitted suprathermal bremsstrahlung radiation motivates the design of a proposed new tomographic HXR spectrometer reported in this paper. The design, which is based on a compact modified Soller collimator concept, is being aided by simulations of tomographic reconstruction. Quantitative criteria have been developed to optimize the design for the greatly variable shapes and positions of TCV plasmas.

Authors:
;  [1]; ;  [2]
  1. Association Euratom-Confederation Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland)
  2. Association Euratom-CEA, CCEA/DSM/IRFM, CEA Cadarache, 13108 St Paul lez Durance (France)
Publication Date:
OSTI Identifier:
21266658
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 79; Journal Issue: 10; Conference: HTPD08: 17. topical conference on high-temperature plasma diagnostics, Albuquerque, NM (United States), 11-15 May 2008; Other Information: DOI: 10.1063/1.2957843; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BREMSSTRAHLUNG; CYCLOTRONS; DESIGN; ECR CURRENT DRIVE; ECR HEATING; ELECTRONS; EMISSION; HARD X RADIATION; PLASMA; PLASMA DIAGNOSTICS; PLASMA INSTABILITY; RADIOMETERS; RF SYSTEMS; SAWTOOTH OSCILLATIONS; TCV TOKAMAK; X-RAY SPECTROMETERS

Citation Formats

Gnesin, S, Coda, S, Decker, J, and Peysson, Y. Suprathermal electron studies in the TCV tokamak: Design of a tomographic hard-x-ray spectrometer. United States: N. p., 2008. Web. doi:10.1063/1.2957843.
Gnesin, S, Coda, S, Decker, J, & Peysson, Y. Suprathermal electron studies in the TCV tokamak: Design of a tomographic hard-x-ray spectrometer. United States. https://doi.org/10.1063/1.2957843
Gnesin, S, Coda, S, Decker, J, and Peysson, Y. 2008. "Suprathermal electron studies in the TCV tokamak: Design of a tomographic hard-x-ray spectrometer". United States. https://doi.org/10.1063/1.2957843.
@article{osti_21266658,
title = {Suprathermal electron studies in the TCV tokamak: Design of a tomographic hard-x-ray spectrometer},
author = {Gnesin, S and Coda, S and Decker, J and Peysson, Y},
abstractNote = {Electron cyclotron resonance heating and electron cyclotron current drive, disruptive events, and sawtooth activity are all known to produce suprathermal electrons in fusion devices, motivating increasingly detailed studies of the generation and dynamics of this suprathermal population. Measurements have been performed in the past years in the tokamak a configuration variable (TCV) tokamak using a single pinhole hard-x-ray (HXR) camera and electron-cyclotron-emission radiometers, leading, in particular, to the identification of the crucial role of spatial transport in the physics of ECCD. The observation of a poloidal asymmetry in the emitted suprathermal bremsstrahlung radiation motivates the design of a proposed new tomographic HXR spectrometer reported in this paper. The design, which is based on a compact modified Soller collimator concept, is being aided by simulations of tomographic reconstruction. Quantitative criteria have been developed to optimize the design for the greatly variable shapes and positions of TCV plasmas.},
doi = {10.1063/1.2957843},
url = {https://www.osti.gov/biblio/21266658}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 79,
place = {United States},
year = {Wed Oct 15 00:00:00 EDT 2008},
month = {Wed Oct 15 00:00:00 EDT 2008}
}