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Numerical analysis of the production profile of atoms and subsequent ions in large negative ion sources
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10.1063/1.2887996
/content/aip/journal/jap/103/5/10.1063/1.2887996
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/5/10.1063/1.2887996

Figures

Image of FIG. 1.
FIG. 1.

Dissociation rate of the molecules as a function of the electron temperature (cited from Ref. 5).

Image of FIG. 2.
FIG. 2.

A typical single Langmuir probe measurement. The electron temperature and density are deduced using a single-/two-temperature fit.

Image of FIG. 3.
FIG. 3.

A schematic illustration of the model geometry.

Image of FIG. 4.
FIG. 4.

Longitudinal profiles of (a) the electron temperature/density in the high-energy tail and (b) the thermal electron temperature/density at and .

Image of FIG. 5.
FIG. 5.

Longitudinal profiles of the atom production rate near the center of the plasma chamber at and . atom production without electrons in the high-energy tail tail) is also plotted.

Image of FIG. 6.
FIG. 6.

Normalized profiles of the thermal electron density along the axis at and .

Image of FIG. 7.
FIG. 7.

Normalized longitudinal profiles of the calculated atom flux on the PG and the resultant ion production on the PG surface at .

Image of FIG. 8.
FIG. 8.

Effects of the FFAF on the longitudinal profiles of (a) the calculated atom flux on the PG and (b) the resultant ion production on the PG surface at .

Image of FIG. 9.
FIG. 9.

The ratio of the FFAF with energy to the total flux with the same energy at .

Image of FIG. 10.
FIG. 10.

Longitudinal profiles of the measured ion beam intensity and calculated ion production on the PG surface at . The experimental data were obtained from Ref. 22.

Image of FIG. 11.
FIG. 11.

Effects of the two-temperature fit on (a) the EEDF and (b) the dissociation rate of molecules. The experimental data were obtained from Ref. 23.

Image of FIG. 12.
FIG. 12.

Longitudinal profiles of (a) ion production and (b) normalized ion production on the PG surface at with/without the atom energy relaxation at the wall (wall effect).

Image of FIG. 13.
FIG. 13.

Dependencies of particle reflection coefficients calculated from experimental fitting equation (Ref. 14) (Fitting) and theoretical simulation results (Refs. 24 and 25) (Hiskes) on (a) incident energy and (b) reduced energy.

Image of FIG. 14.
FIG. 14.

Longitudinal profiles of (a) ion production and (b) normalized ion production on the PG surface when the walls are covered with the tungsten (W) and cesium (Cs) at .

Image of FIG. 15.
FIG. 15.

Effect of the ion temperature on the longitudinal profiles of (a) the ion production and (b) the normalized ion production on the PG surface at .

Image of FIG. 16.
FIG. 16.

Longitudinal profiles of (a) the ion production and (b) the normalized ion production on the plasma grid surface at according to the equation of Rasser et al. (Ref. 12) (Rasser) and that of Seidl et al. (Ref. 30) (Seidl).

Image of FIG. 17.
FIG. 17.

Longitudinal profiles of the atom flux and ion flux on the PG surface at . The profile of the ion flux is obtained from Ref. 22.

Image of FIG. 18.
FIG. 18.

Effects of the ion flux on the longitudinal profile of the ion production on the plasma grid surface at . The effects of (a) the ion temperature and (b) the sheath potential on the production profile of the ions are shown.

Image of FIG. 19.
FIG. 19.

Longitudinal profiles of the normalized ion production on the PG surface and the normalized extraction yield of the ions.

Tables

Generic image for table
Table I.

Effects investigated in Ref. 6 and this study (○: studied; ×: neglected).

Generic image for table
Table II.

Reactions taken into account in the simulation code.

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/content/aip/journal/jap/103/5/10.1063/1.2887996
2008-03-05
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Numerical analysis of the production profile of H0 atoms and subsequent H− ions in large negative ion sources
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/5/10.1063/1.2887996
10.1063/1.2887996
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