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Role of positive ions on the surface production of negative ions in a fusion plasma reactor type negative ion source—Insights from a three dimensional particle-in-cell Monte Carlo collisions model
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10.1063/1.4834475
/content/aip/journal/pop/20/11/10.1063/1.4834475
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/11/10.1063/1.4834475

Figures

Image of FIG. 1.
FIG. 1.

Schematic view of the 3D simulated geometry. From left to right, the ICP discharge (also called “driver”) couples the external power from RF coils (unsimulated) to the plasma; the next section is the expansion chamber which is magnetized. The magnetic field barrier is generated by a set of permanent magnets located on the lateral walls of the chamber. Field lines are outlined in blue. The dotted-dashed lines on the RHS wall are the so-called PG, which connects the ion source to the electrostatic accelerator.

Image of FIG. 2.
FIG. 2.

2D profiles of the plasma potential are shown in the XY (Z = 0) and XZ (Y = 0) planes. Iso-potential lines are also displayed. The PG is biased at 20 V. The plasma asymmetry in the electron magnetic drift plane (Y = 0) is clearly visible.

Image of FIG. 3.
FIG. 3.

Positive ion flux energy distribution functions (edf) on the PG for the three ion species, , and .

Image of FIG. 4.
FIG. 4.

Charged particle density profiles on the ion source axis ( = = 0).

Image of FIG. 5.
FIG. 5.

Plasma potential profile on the ion source axis versus the PG bias voltage.

Image of FIG. 6.
FIG. 6.

(a) Electron () and total positive ion ( ) currents on PG versus bias. The negative ion current also plotted corresponds only to negative ions produced by positive ion impact on the PG (i.e., negative ions generated by atomic hydrogen impact or returning to the PG are not included). (b)Average kinetic energy of the incident positive ions on PG.

Image of FIG. 7.
FIG. 7.

Average positive ion kinetic energy on the ion source axis, . Profiles are shown from the middle of the driver up to 2cm from the PG. The potential gap in this region is and the PG bias is 20 V.

Image of FIG. 8.
FIG. 8.

Positive ion means free paths (mfp). Total elastic, charge exchange, and inelastic collision mfp (solid lines) and destruction mfp (dashed-lines) are shown. The blue color corresponds to protons, black for and grey ions. The PG bias is set to 20 V.

Tables

Generic image for table
Table I.

Electron collisions.

Generic image for table
Table II.

Heavy particle processes.

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/content/aip/journal/pop/20/11/10.1063/1.4834475
2013-11-25
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Role of positive ions on the surface production of negative ions in a fusion plasma reactor type negative ion source—Insights from a three dimensional particle-in-cell Monte Carlo collisions model
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/11/10.1063/1.4834475
10.1063/1.4834475
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