title: Observation of >400-eV precursor plasmas from low-wire-number copper arrays at the 1-MA zebra facility.
abstract: Experiments with cylindrical copper wire arrays at the 1-MA Zebra facility show that high temperatures exist in the precursor plasmas formed when ablated wire array material accretes on the axis prior to the stagnation of a z pinch. In these experiments, the precursor radiated approximately 20% of the >1000 eV x-ray output, and time-resolved spectra show substantial emission from Cu L-shell lines. Modeling of the spectra shows an increase in temperature as the precursor forms, up to approximately 450 eV, after which the temperature decreases to approximately 220-320 eV until the main implosion.
authors.affiliation: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Coverdale
authors.forename: A S
authors.initials: AS
authors.lastname: Safronova
authors.forename: V L
authors.initials: VL
authors.lastname: Kantsyrev
authors.forename: N D
authors.initials: ND
authors.lastname: Ouart
authors.forename: A A
authors.initials: AA
authors.lastname: Esaulov
authors.forename: C
authors.initials: C
authors.lastname: Deeney
authors.forename: K M
authors.initials: KM
authors.lastname: Williamson
authors.forename: G C
authors.initials: GC
authors.lastname: Osborne
authors.forename: I
authors.initials: I
authors.lastname: Shrestha
authors.forename: D J
authors.initials: DJ
authors.lastname: Ampleford
authors.forename: B
authors.initials: B
authors.lastname: Jones