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@TECHREPORT{Janev:850290,
author = {Janev, Ratko and Reiter, Detlev},
title = {{I}sotope {E}ffects in {M}olecule {A}ssisted
{R}ecombination and {D}issociation in {D}ivertor {P}lasmas},
volume = {4411},
number = {Juel-4411},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2018-04332, Juel-4411},
series = {Berichte des Forschungszentrums Jülich},
pages = {37 p.},
year = {2018},
abstract = {A 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.},
cin = {IEK-4},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {174 - Plasma-Wall-Interaction (POF3-174)},
pid = {G:(DE-HGF)POF3-174},
typ = {PUB:(DE-HGF)3 / PUB:(DE-HGF)29},
url = {https://juser.fz-juelich.de/record/850290},
}