Spectroscopic camera analysis of the roles of molecularly assisted reaction chains during detachment in JET L-mode plasmas

The roles of the molecularly assisted ionization (MAI), recombination (MAR) and dissociation (MAD) reaction chains with respect to purely atomic processes were studied experimentally during detachment in low-confinement mode (L-mode) plasmas JET help inferred divertor plasma neutral conditions, extracted previously from filtered camera observations deuterium Balmer emission, coefficients provided by ADAS, AMJUEL H2VIBR molecular databases. direct contribution MAI MAR outer particle balance was found be inferior electron–atom (EAI) electron–ion (EIR). Near strike point, a strong atom source due D 2 + -driven MAD was, however, observed correlate onset at point temperatures T e,osp = 0 . 9 –2.0 eV via increased plasma-neutral interactions before increasing dominance EIR < 0.9 eV, followed degree detachment. analysis supported predictions EDGE2D-EIRENE simulations which qualitative agreement experimental observations. • Roles MAI, emission JET. Global dominated recombination. have vital role as for interactions.