{"title":"Scaling law for interchange transport in magnetically confined electron-positron plasmas with ion impurity","authors":"M. Kühbauch, A. Kendl","doi":"10.1016/j.fpp.2022.09.001","DOIUrl":"10.1016/j.fpp.2022.09.001","url":null,"abstract":"<div><p>Interchange instabilities are a critical issue for confinement and transport in (otherwise exceptionally stable) planned magnetically confined quasi-neutral electron-positron plasma experiments. An additional ion impurity concentration can signifcantly affect the instability. The dispersion relation for interchange modes in perturbed inhomogeneously magnetized electron-positron plasmas in the presence of impurity ions is derived from full-f isothermal gyrofluid equations. The model includes arbitrary ion concentration and Debye screening effects. The resulting interchange growth rate of localized density perturbations is related to the cross-field propagation velocity and associated transport, which is reduced by an additional ion concentration compared to pure electron-positron plasmas. A simplified scaling relation is obtained from the exact analysis and compared with previous pure electron-positron plasma limits and empirical scalings based on simulation data.</p></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"2 ","pages":"Article 100002"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772828522000036/pdfft?md5=3ec0f25988d7a6f190096b30cd3e55b4&pid=1-s2.0-S2772828522000036-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82230201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Magnetic properties of twisted plasmons","authors":"J.T. Mendonça","doi":"10.1016/j.fpp.2022.07.001","DOIUrl":"10.1016/j.fpp.2022.07.001","url":null,"abstract":"<div><p>We consider the linear and nonlinear properties of twisted plasmons propagating in a magnetized plasma. Twisted plasmons are electron plasma waves with a finite amount of angular momentum. In contrast with plane plasma waves, which propagate along the static magnetic field direction with the same dispersion as in isotropic plasmas, the properties of twisted waves depend on the value of their angular momentum. A new dispersion relation is derived, using the fluid approximation. We also study nonlinear effects associated with twisted plasmons, and show that they introduce electromagnetic corrections. Of particular relevance is the excitation of a quasi-static magnetic field, which is associated with finite amplitude plasmon solutions.</p></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"1 ","pages":"Pages 1-5"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772828522000012/pdfft?md5=24390ed2eab1383374ba885215e8a3c5&pid=1-s2.0-S2772828522000012-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74550491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Aguilar-Benitez, Á. Morales, E. Fernández, F. Ynduráin
{"title":"25th International Winter Meeting on Fundamental Physics","authors":"M. Aguilar-Benitez, Á. Morales, E. Fernández, F. Ynduráin","doi":"10.1142/9789814528214","DOIUrl":"https://doi.org/10.1142/9789814528214","url":null,"abstract":"","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73448603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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