Laser ablation/ionization mass spectrometry on tokamak deposition probes

M. Á Kedves, J. Bakos, P. N. Ignácz, B. Kardon, J. Szigeti

Research output: Contribution to journalArticle

Abstract

Laser ablation-ionization mass spectrometric surface analysis was applied in plasma diagnostic experiments on the MT-1M tokamak. Non-intrinsic impurities were injected into the discharges using laser blow-off in order to study the impurity transport processes. High purity silicon samples were used as deposition probes in the edge plasma of the tokamak. The distributions of the impurities deposited on the probe surfaces during the discharges were measured after the exposures by laser ionization mass spectrometry. In the first experiments with sodium impurities the surface distributions showed a considerable poloidal dependence besides the well known decrease with increasing minor radius. The poloidal dependence showed mirror-like symmetry on the probes facing the ion and electron sides. In the second experimental series carried out with tungsten impurities even more localized deposit distributions were obtained. The results are explained assuming that the impurities propagate in confined packets along the magnetic field lines even for several toroidal turns.

Original languageEnglish
Pages (from-to)137-143
Number of pages7
JournalApplied Surface Science
Volume106
DOIs
Publication statusPublished - Oct 1996

Fingerprint

Laser ablation
laser ablation
Ionization
Mass spectrometry
mass spectroscopy
Impurities
ionization
impurities
probes
Plasma diagnostics
Tungsten
Lasers
plasma diagnostics
Surface analysis
Silicon
lasers
tungsten
purity
Mirrors
Deposits

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

Laser ablation/ionization mass spectrometry on tokamak deposition probes. / Kedves, M. Á; Bakos, J.; Ignácz, P. N.; Kardon, B.; Szigeti, J.

In: Applied Surface Science, Vol. 106, 10.1996, p. 137-143.

Research output: Contribution to journalArticle

Kedves, M. Á ; Bakos, J. ; Ignácz, P. N. ; Kardon, B. ; Szigeti, J. / Laser ablation/ionization mass spectrometry on tokamak deposition probes. In: Applied Surface Science. 1996 ; Vol. 106. pp. 137-143.
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