Charge Transfer and Ionization in Collisions with Hydrogen Atoms

Gilbody, H B

doi:10.1088/0031-8949/24/4/006

Cited by 34 publications

(3 citation statements)

References 123 publications

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“…The summation is performed over all ion species in the plasma. The impurity contribution to the mean free path is taken into account by using the approximate relationship <a c ^v> s Z a <a §jV> [19], so that the summation is simply replaced by n e <a^v>.…”

Section: Simulation Of Results In the Stationary Casementioning

confidence: 99%

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Neutral particle emission in JET during radiofrequency heating experiments

Giannella¹,

Zanza²,

Barbato³

et al. 1988

Nucl. Fusion

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The paper deals with the simulation of neutral particle spectra obtained in JET with an array of four passive neutral particle analysers during discharges with applied stationary or modulated radiofrequency power in the ion cyclotron range of frequencies for a deuterium plasma with hydrogen minority. The distribution function of the hydrogen ions has been computed using a one-dimensional Fokker-Planck equation describing wave-particle interaction by a quasi-linear diffusion term in velocity space. Both stationary and oscillating solutions of the Fokker-Planck equation have been worked out and the computed hydrogen fluxes have been found to be in very good agreement with the measured ones. In this context, the problems arising in the deduction of the power deposition profiles in modulated discharges are discussed. The profiles of power delivered to the electrons and the bulk ions have been obtained. It is shown that no adjustable parameters need to be introduced and that the main source of error lies in the uncertainty in the knowledge of the ion density.

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Section: Simulation Of Results In the Stationary Casementioning

confidence: 99%

“…The last condition cannot be fulfilled for very low frequencies, as can be seen from Eqs (19) and (20), taking into account relations (21). To find out whether this condition is fulfilled for higher frequencies, f 2 must be evaluated.…”

Section: The Fokker-planck Equationmentioning

confidence: 99%

Neutral particle emission in JET during radiofrequency heating experiments

Giannella¹,

Zanza²,

Barbato³

et al. 1988

Nucl. Fusion

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“…This ratio approaches 0.7 in the low collisional energy limit and increases to 4 for the high energies. The slow collisions of heavy low charged ions including W q+ ions (6 q 15) with the H and H 2 targets (our case) were investigated in [19][20][21]. No clear relationship between the measured σ H 2 and σ H CE cross sections was found for the studied ions, but it was shown that the behaviour of the ratio σ H 2 /σ H differs from this ratio for the highly charged projectiles.…”

Section: Charge Exchange In Low-energy Collisions: Experiments and Th...mentioning

confidence: 94%

Charge-changing collisions of tungsten and its ions with neutral atoms

Tolstikhina¹,

Song²,

Imai³

et al. 2012

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

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New experimental and theoretical data on charge exchange (CE) cross sections are presented for low-energy collisions (10-500 eV u −1 ) of W + and W 2+ ions with H, H 2 and He atoms. The CE cross sections are calculated using the ARSENY code based on the hidden crossing method. The isotope effect (mass dependence) in collisions of W + and W 2+ ions with hydrogen isotopes H, D, T is studied in the framework of the adiabatic theory of transitions in slow collisions. Furthermore, the electron loss (EL) and CE cross sections for the energy range of 1-10 5 keV u −1 are calculated for tungsten and its ions W q+ (q = 0-40) colliding with H, He, N, Ar and W atoms using the computer codes (CAPTURE, DEPOSIT and RICODE) based upon the Born approximation and the classical energy-deposition model. The data obtained can be used for plasma modelling, planning and interpretation of future experiments in fusion devices using tungsten as a material for the plasma-facing components.

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Experiments on Electron Capture and Ionization by Multiply Charged Ions

Heer

1983

Atomic and Molecular Physics of Controlled Thermonuclear Fusion

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Charge Transfer and Ionization in Collisions with Hydrogen Atoms

Abstract: A review is given of the results of experimental studies of electron cap ture, loss and ionization in collisions of atomic species with hydrogen atoms. The results are considered in relation to current theoretical descriptions of the collision processes.

Cited by 34 publications

References 123 publications

Neutral particle emission in JET during radiofrequency heating experiments

Neutral particle emission in JET during radiofrequency heating experiments

Charge-changing collisions of tungsten and its ions with neutral atoms

Experiments on Electron Capture and Ionization by Multiply Charged Ions

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