Intergrain forces in low-Mach-number plasma wakes
Large-scale particle-in-cell calculations of the plasma wake interactions of two negatively charged grains smaller than the Debye length are carried out using the coptic code over a wide range of subsonic plasma flow velocities. In plasmas with the temperature ratio T[subscript e]/T[subscript i]=100...
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/72398 |
| _version_ | 1811095807614517248 |
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| author | 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 Hutchinson, Ian Horner |
| author_sort | Hutchinson, Ian Horner |
| collection | MIT |
| description | Large-scale particle-in-cell calculations of the plasma wake interactions of two negatively charged grains smaller than the Debye length are carried out using the coptic code over a wide range of subsonic plasma flow velocities. In plasmas with the temperature ratio T[subscript e]/T[subscript i]=100, it is found that a single grain's oscillatory wake disappears for flow Mach numbers M less than approximately 0.3, which is the parameter regime where Landau damping is expected to be strong. Neutral collisions suppress potential oscillations above M=0.3, but not the trailing attractive potential peak caused by ion focusing. The transverse (grain-aligning) force on a downstream particle in the wake of another is obtained rigorously from the code in three-dimensional simulations. It shows general agreement with the force that would be deduced from the single-grain wake potential gradient. Except for relatively large grains in the nonlinear collisional regime, the grain-aligning force is very small for slow flow. |
| first_indexed | 2024-09-23T16:28:49Z |
| format | Article |
| id | mit-1721.1/72398 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:28:49Z |
| publishDate | 2012 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/723982023-02-26T02:06:24Z Intergrain forces in low-Mach-number plasma wakes Hutchinson, Ian Horner Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Hutchinson, Ian Horner Hutchinson, Ian H. Large-scale particle-in-cell calculations of the plasma wake interactions of two negatively charged grains smaller than the Debye length are carried out using the coptic code over a wide range of subsonic plasma flow velocities. In plasmas with the temperature ratio T[subscript e]/T[subscript i]=100, it is found that a single grain's oscillatory wake disappears for flow Mach numbers M less than approximately 0.3, which is the parameter regime where Landau damping is expected to be strong. Neutral collisions suppress potential oscillations above M=0.3, but not the trailing attractive potential peak caused by ion focusing. The transverse (grain-aligning) force on a downstream particle in the wake of another is obtained rigorously from the code in three-dimensional simulations. It shows general agreement with the force that would be deduced from the single-grain wake potential gradient. Except for relatively large grains in the nonlinear collisional regime, the grain-aligning force is very small for slow flow. National Science Foundation (U.S.). (United States. Dept. of Energy.) (Grant Number DE-FG02- 06ER54982) 2012-08-28T20:30:54Z 2012-08-28T20:30:54Z 2012-06 2012-04 Article http://purl.org/eprint/type/JournalArticle 1539-3755 1550-2376 http://hdl.handle.net/1721.1/72398 Hutchinson, I. “Intergrain Forces in low-Mach-number Plasma Wakes.” Physical Review E 85.6 (2012). ©2012 American Physical Society en_US http://dx.doi.org/10.1103/PhysRevE.85.066409 Physical Review E Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Hutchinson, Ian Horner Intergrain forces in low-Mach-number plasma wakes |
| title | Intergrain forces in low-Mach-number plasma wakes |
| title_full | Intergrain forces in low-Mach-number plasma wakes |
| title_fullStr | Intergrain forces in low-Mach-number plasma wakes |
| title_full_unstemmed | Intergrain forces in low-Mach-number plasma wakes |
| title_short | Intergrain forces in low-Mach-number plasma wakes |
| title_sort | intergrain forces in low mach number plasma wakes |
| url | http://hdl.handle.net/1721.1/72398 |
| work_keys_str_mv | AT hutchinsonianhorner intergrainforcesinlowmachnumberplasmawakes |