title: Effect of core-corona plasma structure on seeding of instabilities in wire array Z pinches
abstract: We present the first measurements by x-ray radiography of the development of instabilities during the implosion phase of wire array Z pinches. The seeding of perturbations on the dense core of each wire is provided by nonuniform sweeping of the low-density coronal plasma from the cores by the global JxB force. The spatial scale of these perturbations ( approximately 0.5 mm for Al and approximately 0.25 mm for W) is determined by the size of the wire cores ( approximately 0.25 mm for Al and approximately 0.1 mm for W). A qualitative change in implosion dynamics, with transition to 0D-like trajectory, was observed in Al arrays when the ratio of interwire gap to wire core size was decreased to approximately 3.
authors.affiliation: The Blackett Laboratory, Imperial College, London, SW7 2BZ, United Kingdom.
authors.initials: SV
authors.lastname: Lebedev
authors.initials: FN
authors.lastname: Beg
authors.initials: SN
authors.lastname: Bland
authors.initials: JP
authors.lastname: Chittenden
authors.initials: AE
authors.lastname: Dangor
authors.initials: MG
authors.lastname: Haines
authors.initials: SA
authors.lastname: Pikuz
authors.initials: TA
authors.lastname: Shelkovenko