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000850290 005__ 20240711114027.0
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000850290 1001_ $$0P:(DE-Juel1)130046$$aJanev, Ratko$$b0$$ufzj
000850290 245__ $$aIsotope Effects in Molecule Assisted Recombination and Dissociation in Divertor Plasmas
000850290 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2018
000850290 300__ $$a37 p.
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000850290 4900_ $$aBerichte des Forschungszentrums Jülich$$v4411
000850290 520__ $$aA burning fusion plasma will necessarily contain a mixture of D and T iso-topes, in the atomic, molecular and ionised components. It is demonstrated that molecule assisted recombination (MAR) and dissociation (MAD) mech-anisms expected to be strong in typical low-temperature hydrogenic diver-tor plasmas exhibit a kinetic isotope effect. The effect originates from the mass dependence of rate coeffcients of dissociative electron attachment and atomic-to-molecular ion conversion reactions, that are common precursors for MAR and MAD mechanisms. MAR favours a faster recombbination of the lighter ion with plasma electrons, while MAD favours a faster dissociation of the lighter molecule. The effect is cumulative, and during the ion residence time in the divertor it may produce significant differences in the recombined electron-ion pairs of the two isotopes, and in the amounts of dissociation products of the two isotopic molecules. For example a factor of 3 - 9 in MAR, and 22 - 400 in MAD in the concentrations of recombination and dissociation products results, for T = 3 eV, n$_{e}$ = 3 $\cdot$ 10$^{14}$ cm$^{-3}$ and [H$_{2}$]:[D$_{2}$]:[HD] in the range 1:1:0 - 1:1:2. Some implications of MAR and MAD isotope effects for divertor plasma physics are discussed.
000850290 536__ $$0G:(DE-HGF)POF3-174$$a174 - Plasma-Wall-Interaction (POF3-174)$$cPOF3-174$$fPOF III$$x0
000850290 7001_ $$0P:(DE-Juel1)5006$$aReiter, Detlev$$b1$$ufzj
000850290 8564_ $$uhttps://juser.fz-juelich.de/record/850290/files/J%C3%BCl_4411_Reiter.pdf$$yOpenAccess
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