Consistency of atomic data for the interpretation of beam emission spectra

E. Delabie, M. Brix, C. Giroud, R. J. E. Jaspers, O. Marchuk, M. G. O'Mullane, Yu Ralchenko, E. Surrey, M. G. von Hellermann, K. D. Zastrow, JE Contributors

Research output: Contribution to journalArticle

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Abstract

Several collisional-radiative (CR) models (Anderson et al 2000 Plasma Phys. Control. Fusion 42 781-806, Hutchinson 2002 Plasma Phys. Control. Fusion 44 71-82, Marchuk et al 2008 Rev. Sci. Instrum. 79 10F532) have been developed to calculate the attenuation and the population of excited states of hydrogen or deuterium beams injected into tokamak plasmas. The datasets generated by these CR models are needed for the modelling of beam ion deposition and (excited) beam densities in current experiments, and the reliability of these data will be crucial to obtain helium ash densities on ITER combining charge exchange and beam emission spectroscopy. Good agreement between the different CR models for the neutral beam (NB) is found, if corrections to the fundamental cross sections are taken into account. First the H-alpha and H-beta beam emission spectra from JET are compared with the expected intensities. Second, the line ratios within the Stark multiplet are compared with the predictions of a sublevel resolved model. The measured intensity of the full multiplet is approximate to 30% lower than expected on the basis of beam attenuation codes and the updated beam emission rates, but apart from the atomic data this could also be due to the characterization of the NB path and line of sight integration and the absolute calibration of the optics. The modelled n = 3 to n = 4 population agrees very well with the ratio of the measured H-alpha to H-beta beam emission intensities.
LanguageEnglish
Pages125008
Number of pages17
JournalPlasma Physics and Controlled Fusion
Volume52
Issue number12
DOIs
Publication statusPublished - 1 Dec 2010

Fingerprint

emission spectra
Ashes
Plasmas
Fusion reactions
neutral beams
Emission spectroscopy
Deuterium
Excited states
Ion beams
Helium
fusion
attenuation
fine structure
Optics
Calibration
Hydrogen
ashes
charge exchange
line of sight
deuterium

Keywords

  • plasmas
  • particle beam
  • scattering of particles
  • optical measurements

Cite this

Delabie, E., Brix, M., Giroud, C., Jaspers, R. J. E., Marchuk, O., O'Mullane, M. G., ... Contributors, JE. (2010). Consistency of atomic data for the interpretation of beam emission spectra. Plasma Physics and Controlled Fusion, 52(12), 125008. https://doi.org/10.1088/0741-3335/52/12/125008
Delabie, E. ; Brix, M. ; Giroud, C. ; Jaspers, R. J. E. ; Marchuk, O. ; O'Mullane, M. G. ; Ralchenko, Yu ; Surrey, E. ; von Hellermann, M. G. ; Zastrow, K. D. ; Contributors, JE. / Consistency of atomic data for the interpretation of beam emission spectra. In: Plasma Physics and Controlled Fusion. 2010 ; Vol. 52, No. 12. pp. 125008.
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Delabie, E, Brix, M, Giroud, C, Jaspers, RJE, Marchuk, O, O'Mullane, MG, Ralchenko, Y, Surrey, E, von Hellermann, MG, Zastrow, KD & Contributors, JE 2010, 'Consistency of atomic data for the interpretation of beam emission spectra' Plasma Physics and Controlled Fusion, vol. 52, no. 12, pp. 125008. https://doi.org/10.1088/0741-3335/52/12/125008

Consistency of atomic data for the interpretation of beam emission spectra. / Delabie, E.; Brix, M.; Giroud, C.; Jaspers, R. J. E.; Marchuk, O.; O'Mullane, M. G.; Ralchenko, Yu; Surrey, E.; von Hellermann, M. G.; Zastrow, K. D.; Contributors, JE.

In: Plasma Physics and Controlled Fusion, Vol. 52, No. 12, 01.12.2010, p. 125008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Consistency of atomic data for the interpretation of beam emission spectra

AU - Delabie, E.

AU - Brix, M.

AU - Giroud, C.

AU - Jaspers, R. J. E.

AU - Marchuk, O.

AU - O'Mullane, M. G.

AU - Ralchenko, Yu

AU - Surrey, E.

AU - von Hellermann, M. G.

AU - Zastrow, K. D.

AU - Contributors, JE

PY - 2010/12/1

Y1 - 2010/12/1

N2 - Several collisional-radiative (CR) models (Anderson et al 2000 Plasma Phys. Control. Fusion 42 781-806, Hutchinson 2002 Plasma Phys. Control. Fusion 44 71-82, Marchuk et al 2008 Rev. Sci. Instrum. 79 10F532) have been developed to calculate the attenuation and the population of excited states of hydrogen or deuterium beams injected into tokamak plasmas. The datasets generated by these CR models are needed for the modelling of beam ion deposition and (excited) beam densities in current experiments, and the reliability of these data will be crucial to obtain helium ash densities on ITER combining charge exchange and beam emission spectroscopy. Good agreement between the different CR models for the neutral beam (NB) is found, if corrections to the fundamental cross sections are taken into account. First the H-alpha and H-beta beam emission spectra from JET are compared with the expected intensities. Second, the line ratios within the Stark multiplet are compared with the predictions of a sublevel resolved model. The measured intensity of the full multiplet is approximate to 30% lower than expected on the basis of beam attenuation codes and the updated beam emission rates, but apart from the atomic data this could also be due to the characterization of the NB path and line of sight integration and the absolute calibration of the optics. The modelled n = 3 to n = 4 population agrees very well with the ratio of the measured H-alpha to H-beta beam emission intensities.

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KW - plasmas

KW - particle beam

KW - scattering of particles

KW - optical measurements

U2 - 10.1088/0741-3335/52/12/125008

DO - 10.1088/0741-3335/52/12/125008

M3 - Article

VL - 52

SP - 125008

JO - Plasma Physics and Controlled Fusion

T2 - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 12

ER -