Near-field plume properties of an ion beam formed by alternating extraction and acceleration of oppositely charged ions
| Autor: | N. Oudini, A. Bendib, Pascal Chabert, Ane Aanesland, S. Lounes-Mahloul |
|---|---|
| Přispěvatelé: | Laboratoire de Physique des Plasmas (LPP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Ion beam Ion thruster Chemistry Plasma Condensed Matter Physics Ion gun 7. Clean energy 01 natural sciences 010305 fluids & plasmas Ion Acceleration Physics::Plasma Physics [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] 0103 physical sciences Physics::Accelerator Physics Atomic physics Beam (structure) Beam divergence |
| Zdroj: | Plasma Sources Science and Technology Plasma Sources Science and Technology, IOP Publishing, 2016, 25 (5), pp.055013. ⟨10.1088/0963-0252/25/5/055013⟩ Plasma Sources Science and Technology, 2016, 25 (5), pp.055013. ⟨10.1088/0963-0252/25/5/055013⟩ |
| ISSN: | 0963-0252 1361-6595 |
| DOI: | 10.1088/0963-0252/25/5/055013⟩ |
| Popis: | International audience; This paper is devoted to study the expansion of a beam composed of packets of positively and negatively charged ions generated by alternating extraction and acceleration. This beam is extracted from an ionion plasma, i.e. the electron density is negligible compared to the negative ion density. The alternating acceleration of ions is ensured by two grids placed in the ionion plasma region. The screen grid in contact with the plasma is biased with a square voltage waveform while the acceleration grid is grounded. A two-dimensional particle-in-cell (2D-PIC) code and an analytical model are used to study the properties of the near-field plume downstream of the acceleration grid. It is shown that the possible operating bias frequency is delimited by an upper limit and a lower one that are in the low MHz range. The simulations show that alternating acceleration with bias frequencies close to the upper frequency limit for the system can achieve high ion exhaust velocities, similar to traditional gridded ion thrusters, and with lower beam divergence than in classical systems. Indeed, ionion beam envelope might be reduced to 15° with 70% of ion flux contained within an angle of 3°. Thus, this alternating acceleration method is promising for electric space propulsion. |
| Databáze: | OpenAIRE |
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