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Runaway electron energy measurement using hard x-ray spectroscopy in "damavand" tokamak

Rasouli, C ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1063/1.3064917
  3. Publisher: 2009
  4. Abstract:
  5. Set of experiments has been developed to study existing runaway electrons in "Damavand" tokamak plasma upon characteristics of hard x-ray emissions produced by collision of the runaway electrons with the plasma particles and limiters. As a first step, spatial distribution of hard x-ray emissions on the equatorial plane of the torus was considered. Obtained spectra of hard x-ray emissions for different alignments of shielded detector indicate isotropic emissivity in the equatorial plane. This is in agreement with wide angle cone of bremsstrahlung radiations, deduced from the mean value of energy of the runaway electrons. The mean energy was calculated from the slope of the energy spectrum of hard x-ray photons. In the second stage in order to investigate time evolution of energy of the runaway electrons, similar technique were applied to obtain hard x-ray energy in every 3 ms intervals, from the beginning to the end of plasma. The mean energy of the runaway electrons increases during the ramp up phase and reaches its maximum between 3 and 9 ms after plasma formation. Also considering the time dependence of the counted photons in each energy range shows that energetic photons are emitted during the ramp up phase of the plasma current in Damavand tokamak. © 2009 American Institute of Physics
  6. Keywords:
  7. Atoms ; Electromagnetic wave emission ; Electrons ; Emission spectroscopy ; Fusion reactors ; Photons ; Plasmas ; Size distribution ; Spectrum analysis ; X ray scattering ; Bremsstrahlung radiations ; Energetic photons ; Energy ranges ; Energy spectrum ; Equatorial planes ; Hard x-ray emissions ; Hard X-ray spectroscopies ; Hard x-rays ; Mean energies ; Mean values ; Plasma currents ; Plasma formations ; Plasma particles ; Runaway electrons ; Spatial distributions ; Time dependences ; Time evolutions ; Tokamak plasmas ; Wide angles ; X rays
  8. Source: Review of Scientific Instruments ; Volume 80, Issue 1 , 2009 ; 00346748 (ISSN)
  9. URL: https://aip.scitation.org/doi/10.1063/1.3064917