Publication details
PIC/MC calculation of current--voltage characteristic of emissive probe
| Authors | |
|---|---|
| Year of publication | 2022 |
| Type | Article in Periodical |
| Magazine / Source | Plasma Sources Science and Technology |
| MU Faculty or unit | |
| Citation | |
| Web | https://iopscience.iop.org/article/10.1088/1361-6595/ac3342 |
| Doi | http://dx.doi.org/10.1088/1361-6595/ac3342 |
| Keywords | emissive probe; PIC/MC simulation; probe temperature |
| Description | Two numerical models were used to study the functioning of emissive (electron-emitting) probe -- PIC/MC model and thermal model. The PIC/MC model was used for the calculation of I - V characteristics of emissive probe. The calculations were focused on the determination of floating probe potential, which increases with increasing probe temperature. It was found that the floating potential can reach the value of plasma potential, even it can be higher than the plasma potential. The dependence of floating potential on probe temperature is linear in the vicinity of plasma potential, the slope of this dependence changes when the floating potential equals the plasma potential. The potential profiles near the probe were also calculated and it was found that the space charge effects can be neglected for plasma parameters studied (electron density 1014 - 1016 m-3, electron temperature 2500 - 40000 K, probe temperature up to 2 500 K). The thermal model was used for the calculation of the dependence of probe temperature and potential profiles on DC current passing through the probe (and heating the probe). The thermal model was based on heat equation, which was solved using the finite element method. Finally, the results from both above-mentioned models were combined together to obtain the dependencies of floating potential on probe heating DC current. |