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To study these systems, it is important to understand the coupling process between the plasmas. In this work, we develop a semi-analytical model of the parameters that characterize the strong collisionless coupling between an unmagnetized driver plasma and a uniformly and perpendicularly magnetized background plasma. In particular, we derive analytical expressions that describe the characteristic diamagnetic cavity and magnetic compression of these systems, such as their corresponding velocities, the compression ratio, and the maximum size of the cavity. The semi-analytical model is compared with collisionless 1D particle-in-cell simulations and experimental results with laser-driven plasmas. The model allows us to provide bounds for parameters that are otherwise difficult to diagnose in experiments with similar setups.<\/jats:p>","DOI":"10.1063\/5.0144725","type":"journal-article","created":{"date-parts":[[2023,5,1]],"date-time":"2023-05-01T11:25:44Z","timestamp":1682940344000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":4,"title":["Strong collisionless coupling between an unmagnetized driver plasma and a magnetized background plasma"],"prefix":"10.1063","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5384-4288","authenticated-orcid":false,"given":"F. D.","family":"Cruz","sequence":"first","affiliation":[{"name":"GoLP\/Instituto de Plasmas e Fus\u00e3o Nuclear, Instituto Superior T\u00e9cnico, Universidade de Lisboa 1 , Lisboa 1049-001, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1675-5910","authenticated-orcid":false,"given":"D. 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