Creation and expansion of a magnetized plasma bubble for plasma propulsion |
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| Institution: | 1. ICAAM— Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Universidade de Évora, Núcleo da Mitra, Ap. 94, 7002-554 Évora, Portugal;2. Departamento de Paisagem, Ambiente e Ordenamento, Escola de Ciências e Tecnologia, Universidade de Évora, Colégio Luis António Verney, Rua Romão Ramalho, 59, 7000-671 Évora, Portugal;1. Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, Lisboa 1349-017, Portugal;2. Geo-Space Sciences Research Centre, (CICGE), Rua do Campo Alegre, Porto 4169-007, Portugal;3. InBIO/CIBIO, Research Centre in Biodiversity and Genetic Resources, University of Porto, Campus Agrário de Vairão, Rua Padre Armando Quintas, nr. 7, 4485-661 Vairão, Portugal;4. Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, Porto 4169-007, Portugal;5. Associação para o Desenvolvimento da Viticultura Duriense, Edifício Centro de Excelência da Vinha e do Vinho Parque de Ciência e Tecnologia de Vila Real, Régia Douro Park, Portugal;1. Department of Electrical Engineering, University of California Los Angeles, Los Angeles, CA 90095, USA;2. Department of Engineering Physics, Tsinghua University, Beijing 100084, China;3. Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, CA 90095, USA;4. Lawrence Livermore National Laboratory, Livermore, CA, USA;5. GOLP/Instituto de Plasma e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal;6. ISCTE—Instituto Universitário de Lisboa, 1649–026, Lisbon, Portugal;1. Departamento de Paisagem, Ambiente e Ordenamento, Universidade de Évora, 7002-554 Évora, Portugal;2. ICAAM – Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Universidade de Évora, Núcleo da Mitra, Apt. 94, 7002-554 Évora, Portugal;1. Department of Electrical Engineering, University of California Los Angeles, Los Angeles, CA 90095, USA;2. Department of Engineering Physics, Tsinghua University, Beijing 100084, China;3. Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, CA 90095, USA;4. Instituto Superior Técnico, Lisbon, Portugal;5. ISCTE – Instituto Universitário de Lisboa, 1649-026, Lisbon, Portugal;1. Department of Physical Chemistry, Faculty of Science, University of Vigo, 32004 Ourense, Spain;2. Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal;3. Nutrition and Bromatology Group, Faculty of Food Science and Technology, University of Vigo, Ourense Campus, E32004 Ourense, Spain |
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| Abstract: | We discuss the coupled expansion of a plasma cloud and a neutral gas, both originating from a point-like source located in space and submitted to the action of an external flux of ionizing radiation. This problem is relevant to the artificial magnetospheric propulsion scheme for solar system exploration. We establish the relevant space and time scales for particle diffusion and plasma bubble formation. Emphasis is placed on the low ionization and high collisionallity of the plasma near the point source, leading to the existence of a small ionosphere surrounding the source, where (contrary to the more common views of this propulsion scheme) the ions are not magnetized. The possibility of direct plasma creation by an initial purely neutral gas release is also envisaged. |
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