Collisional effects on nonlinear ion drag force for small grains
The ion drag force arising from plasma flow past an embedded spherical grain is calculated self-consistently and non-linearly using particle in cell codes, accounting for ion-neutral collisions. Using ion velocity distribution appropriate for ion drift driven by a force field gives wake potential an...
| Main Authors: | , |
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| Format: | Article |
| Language: | en_US |
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American Institute of Physics (AIP)
2015
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| Online Access: | http://hdl.handle.net/1721.1/95826 https://orcid.org/0000-0002-8899-7479 |
| _version_ | 1811094052653760512 |
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| author | Haakonsen, Christian Bernt Hutchinson, Ian Horner |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Haakonsen, Christian Bernt Hutchinson, Ian Horner |
| author_sort | Haakonsen, Christian Bernt |
| collection | MIT |
| description | The ion drag force arising from plasma flow past an embedded spherical grain is calculated self-consistently and non-linearly using particle in cell codes, accounting for ion-neutral collisions. Using ion velocity distribution appropriate for ion drift driven by a force field gives wake potential and force greatly different from a shifted Maxwellian distribution, regardless of collisionality. The low-collisionality forces are shown to be consistent with estimates based upon cross-sections for scattering in a Yukawa (shielded) grain field, but only if non-linear shielding length is used. Finite collisionality initially enhances the drag force, but only by up to a factor of 2. Larger collisionality eventually reduces the drag force. In the collisional regime, the drift distribution gives larger drag than the shift distribution even at velocities where their collisionless drags are equal. Comprehensive practical analytic formulas for force that fit the calculations are provided. |
| first_indexed | 2024-09-23T15:54:42Z |
| format | Article |
| id | mit-1721.1/95826 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:54:42Z |
| publishDate | 2015 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/958262023-02-26T03:37:58Z Collisional effects on nonlinear ion drag force for small grains Haakonsen, Christian Bernt Hutchinson, Ian Horner Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Plasma Science and Fusion Center Hutchinson, Ian H. Haakonsen, Christian Bernt The ion drag force arising from plasma flow past an embedded spherical grain is calculated self-consistently and non-linearly using particle in cell codes, accounting for ion-neutral collisions. Using ion velocity distribution appropriate for ion drift driven by a force field gives wake potential and force greatly different from a shifted Maxwellian distribution, regardless of collisionality. The low-collisionality forces are shown to be consistent with estimates based upon cross-sections for scattering in a Yukawa (shielded) grain field, but only if non-linear shielding length is used. Finite collisionality initially enhances the drag force, but only by up to a factor of 2. Larger collisionality eventually reduces the drag force. In the collisional regime, the drift distribution gives larger drag than the shift distribution even at velocities where their collisionless drags are equal. Comprehensive practical analytic formulas for force that fit the calculations are provided. United States. Dept. of Energy (National Science Foundation (U.S.). Grant DE-FG02-06ER54982) United States. Dept. of Energy. Office of Science (Graduate Research Fellowship Program) 2015-03-04T20:39:23Z 2015-03-04T20:39:23Z 2013-08 2013-06 Article http://purl.org/eprint/type/JournalArticle 1070664X 1089-7674 http://hdl.handle.net/1721.1/95826 Hutchinson, I. H., and C. B. Haakonsen. “Collisional Effects on Nonlinear Ion Drag Force for Small Grains.” Phys. Plasmas 20, no. 8 (2013): 083701. https://orcid.org/0000-0002-8899-7479 en_US http://dx.doi.org/10.1063/1.4818144 Physics of Plasmas Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Institute of Physics (AIP) arXiv |
| spellingShingle | Haakonsen, Christian Bernt Hutchinson, Ian Horner Collisional effects on nonlinear ion drag force for small grains |
| title | Collisional effects on nonlinear ion drag force for small grains |
| title_full | Collisional effects on nonlinear ion drag force for small grains |
| title_fullStr | Collisional effects on nonlinear ion drag force for small grains |
| title_full_unstemmed | Collisional effects on nonlinear ion drag force for small grains |
| title_short | Collisional effects on nonlinear ion drag force for small grains |
| title_sort | collisional effects on nonlinear ion drag force for small grains |
| url | http://hdl.handle.net/1721.1/95826 https://orcid.org/0000-0002-8899-7479 |
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