TY - JOUR
T1 - Optimisation and assessment of theoretical impurity line power coefficients relevant to ITER and DEMO
AU - Henderson, S S
AU - Bluteau, M
AU - Foster, A
AU - Giunta, A
AU - O'Mullane, M G
AU - Pütterich, T
AU - Summers, H P
N1 - This is an author-created, un-copyedited version of an article published in Plasma Physics and Controlled Fusion. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6587/aa6273.
PY - 2017/3/21
Y1 - 2017/3/21
N2 - Total radiated line power coefficients for ions of medium to heavy weight elements, called PLT coefficients in the Atomic Data and analysis Structure (ADAS), have been improved by algorithmically optimising the selection of configuration sets that underpin the calculation to include the most important radiating transitions driven by both the ground and metastable configurations and to establish and limit the error of truncation. The optimised calculations typically differ from Pütterich by 20 − 30% with truncation error ≲5%. Further appraisal of error due to atomic level bundling, atomic structure and collision strength calculation methods has been carried out. It is shown that bundling to configurations is accurate to ≲10% for all ions except those with closed-shell ground configurations which give errors up to a factor 2−3. For near neutral, closed-shell ions, plane-wave Born collision strength calculations, which omit spin-change, give substantial error in comparison with distorted-wave calculations of PLT. For highly charged ions, spin-system breakdown reduces the error in the PLT markedly, typically ≲10%. The error introduced by the atomic structure codes used here, autostructure and the cowan code, is probably limited to ≲30%.
AB - Total radiated line power coefficients for ions of medium to heavy weight elements, called PLT coefficients in the Atomic Data and analysis Structure (ADAS), have been improved by algorithmically optimising the selection of configuration sets that underpin the calculation to include the most important radiating transitions driven by both the ground and metastable configurations and to establish and limit the error of truncation. The optimised calculations typically differ from Pütterich by 20 − 30% with truncation error ≲5%. Further appraisal of error due to atomic level bundling, atomic structure and collision strength calculation methods has been carried out. It is shown that bundling to configurations is accurate to ≲10% for all ions except those with closed-shell ground configurations which give errors up to a factor 2−3. For near neutral, closed-shell ions, plane-wave Born collision strength calculations, which omit spin-change, give substantial error in comparison with distorted-wave calculations of PLT. For highly charged ions, spin-system breakdown reduces the error in the PLT markedly, typically ≲10%. The error introduced by the atomic structure codes used here, autostructure and the cowan code, is probably limited to ≲30%.
KW - total radiated line power coefficients
KW - error
KW - atomic level bundling
KW - atomic structure
KW - collision strength
KW - electron configuration sets
KW - cooling factor
UR - http://iopscience.iop.org/journal/0741-3335
U2 - 10.1088/1361-6587/aa6273
DO - 10.1088/1361-6587/aa6273
M3 - Article
VL - 59
SP - 1
EP - 8
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
SN - 0741-3335
IS - 5
M1 - 055010
ER -