Hydrocarbons in edge plasmas: a sensitivity analysis

Assessment of Hydrocarbon Electron‐Impact Ionization Cross Section Measurements for Magnetic Fusion

“…How sensitive simulations might be due to such small changes, could be shown by some sensitivity analysis proposed in Ref. [22], for which HYDKIN also provides the necessary tools. This work shall be concluded with some general remarks.…”

“…1.14000E+01 [6,20] The results of the experiments on acetylene contain new data of one process which has not been included into HYDKIN so far, which is process (2f). However, the magnitude of that cross section is small (∼ 2.7 · 10 −18 cm 2 at maximum).…”

“…An analogous comparison as in the previous sections has been made for seven ionization channels of propene, because all the other ionization channels (in total 10) were not included in the earlier data compiled by HYDKIN. The values for the normalized root mean square deviations d as well as the deviation of the maxima and the maximum shifts of the appropriate cross sections can be found in table 6.…”

“…Many of the subdominant channels are therefore much smaller compared to their HYDKIN counterparts. The complete ordered set (beginning with the largest contribution) of contributing reaction channels given by HYDKIN [6] channels have been added due to the peaks at m/z = 38, 37, 28 Thompson, respectively, in the mass spectrum recorded at an electron energy of 100 eV by Feil et al [10]. However, there have been reported no cross sections for these values of m/z and their contribution has been estimated to be ∼ 10 − 20% to the total cross section.…”

Hydrocarbon Collision Cross Sections for Magnetic Fusion: The Methane, Ethane and Propane Families

“…cross sections rather than rate coefficients. The full cross section database is available online, under http://www.hydkin.de [9] and first results of the accompanying online database analysis toolbox (e.g., spectral analysis of chemical time-scales, sensitivity analysis) have been given in [10,11] In this present work we upgrade this database, in particular with respect to the dissociative recombination processes, for which a large number of newer results have become available in recent years, and which is particularly important in the low temperature divertor plasma conditions mentioned above. Also the cross section database for dissociative ionization has been significantly revised, where this above mentioned previous database still suffered from poor quality of cross section fits near the threshold region of the various process channels.…”