TY - JOUR
T1 - Consistency of atomic data for the interpretation of beam emission spectra
AU - Delabie, E.G.
AU - Brix, M.
AU - Giroud, C.
AU - Jaspers, R.J.E.
AU - Marchuk, O.
AU - O'Mullane, M.G.
AU - Ralchenko, Y.
AU - Surrey, E.
AU - Hellermann, von, M.G.
AU - Zastrow, K.-D.
PY - 2010
Y1 - 2010
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 Ha and Hß 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 ˜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 Ha to Hß beam emission intensities.
AB - 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 Ha and Hß 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 ˜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 Ha to Hß beam emission intensities.
U2 - 10.1088/0741-3335/52/12/125008
DO - 10.1088/0741-3335/52/12/125008
M3 - Article
SN - 0741-3335
VL - 52
SP - 125008-1/17
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
IS - 12
M1 - 125008
ER -