Calculation of charge-changing cross-sections of ions or atoms colliding with fast ions using the classical trajectory method

Kaganovich, Igor; Shnidman, Ariel; Mebane, Harrison E.; Davidson, Ronald C.

doi:10.1016/j.nima.2009.03.084

Cited by 6 publications

(3 citation statements)

References 32 publications

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“…For the diffusion term ions k υ CX ik , we include all symmetric (resonant) charge exchange collisions which result in a fast neutral with random velocity vector. The reactions and references used are [30,64,65]:…”

Section: Appendix a Re Plateau 1d Neutral Diffusion Modelmentioning

confidence: 99%

Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model

et al. 2019

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The assimilation of argon injected into post-disruption runaway electron (RE) plateaus is studied and compared to the vertical loss rate for vertically unstable RE plateaus. A 1D diffusion model is developed to include neutral diffusion and ionization and is used to help in data interpretation. It is found that the radial mixing time scale of argon ions (~0.05 s) is comparable to the vertical loss timescale. Neutral argon becomes the dominant Ar species in the RE plateau for large Ar numbers (> 3 × 10 21 ); at the same time the neutral Ar diffusivity decreases due to plasma cooling, causing a saturation in the assimilation of injected Ar on the vertical loss time scale. Injection of Ar into vertically unstable RE plateaus in DIII-D does increase the vertical loss rate, as predicted by previous modeling of ITER. However, there is a decreasing trend in RE current at the wall strike as the Ar quantity is turned up or as the Ar is injected earlier, indicating a decrease in RE energy deposited to the wall.

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Section: Appendix a Re Plateau 1d Neutral Diffusion Modelmentioning

confidence: 99%

Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model

et al. 2019

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“…Since the temperatures near the walls of divertor chambers of fusion devices are rather low (reaching values as low as 0.5 eV), and since atomic hydrogen is the main plasma constituent, the abovementioned processes between H and Li atoms and their negative ions should play an important role in plasma kinetics. Due to important applications in thermonuclear fusion research (for example, International Thermonuclear Experimental Reactor (ITER)), the collisions of Li with H and H + have been intensively investigated [6,[9][10][11][12], but no paper published has been found for the collisions of H − +Li and H − +Li.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of electron transfer and detachment processes in low energy H⁻+ Li and Li⁻+ H collisions

Lin

Yan

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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The charge exchange and collisional detachment processes in H − +Li and Li − +H collisions have been studied by using the quantal molecular orbital close-coupling (QMOCC) method in the energy ranges of about 0.12-1000 eV u −1 and 0.1 meV-1000 eV, respectively, and the inelastic collision cross sections and rate coefficients have been computed and presented. It is found that the electron transfer process in the H − +Li and Li − +H collisions is due to the Demkov coupling between the 1 2 Σ + and 2 2 Σ + states at internuclear distances of about 15a 0 . The collisional electron detachment in the considered collision system is due to the excitation of the remaining six states, which are all unstable against autodetachment. These states are populated through a series of Landau-Zener couplings of the 2 2 Σ + state with upper 2 Σ + states and by the rotational 2 Σ + -2 Π couplings at small internuclear distances. The cross sections for electron transfer in H − +Li and Li − +H collisions in the energy range of 10-1000 eV u −1 attain values in the range of 10 −16 -10 −15 cm 2 (reaching their maximum values of about 5×10 −15 cm 2 at 500-600 eV u −1 ), while the values of the corresponding electron detachment cross sections in this energy range attain generally smaller values.

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“…From, for example, Fig 9 of Ref. [5], it can be seen that the capture cross section (which is what is called charge exchange in that reference) is quite small for ions in the several hundred keV/AMU range, in particular small compared to the ionization cross section. On the other hand the stripping cross section can be significant.…”

Section: Effect Of Ionization and Charge Exchange On The Beam Ionsmentioning

confidence: 95%

Initial Assessment of Electron and X-Ray Production and Charge Exchange in the NDCX-II Accelerator

COHEN¹

2010

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Calculation of charge-changing cross-sections of ions or atoms colliding with fast ions using the classical trajectory method

Cited by 6 publications

References 32 publications

Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model

Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model

Theoretical investigation of electron transfer and detachment processes in low energy H⁻+ Li and Li⁻+ H collisions

Initial Assessment of Electron and X-Ray Production and Charge Exchange in the NDCX-II Accelerator

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Calculation of charge-changing cross-sections of ions or atoms colliding with fast ions using the classical trajectory method

Cited by 6 publications

References 32 publications

Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model

Study of argon assimilation into the post-disruption runaway electron plateau in DIII-D and comparison with a 1D diffusion model

Theoretical investigation of electron transfer and detachment processes in low energy H−+ Li and Li−+ H collisions

Initial Assessment of Electron and X-Ray Production and Charge Exchange in the NDCX-II Accelerator

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Theoretical investigation of electron transfer and detachment processes in low energy H⁻+ Li and Li⁻+ H collisions