title: Measuring E and B fields in laser-produced plasmas with monoenergetic proton radiography.
abstract: Electromagnetic (E/B) fields generated by the interaction with plasmas of long-pulse, low-intensity laser beams relevant to inertial confinement fusion have been measured for the first time using novel monoenergetic proton radiography methods. High-resolution, time-gated radiography images of a plastic foil driven by a 10(14) W/cm(2) laser implied B fields of approximately 0.5 MG and E fields of approximately 1.5 x 10(8) V/m. Simulations of these experiments with LASNEX+LSP have been performed and are in overall (though not exact) agreement with the data both for field strengths and for spatial distributions; this is the first direct experimental test of the laser-generated B-field package in LASNEX. The experiments also demonstrated that laser phase plates substantially reduce medium-scale chaotic field structure.
authors.affiliation: Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: C K
authors.initials: CK
authors.lastname: Li
authors.forename: F H
authors.initials: FH
authors.lastname: Séguin
authors.forename: J A
authors.initials: JA
authors.lastname: Frenje
authors.forename: J R
authors.initials: JR
authors.lastname: Rygg
authors.forename: R D
authors.initials: RD
authors.lastname: Petrasso
authors.forename: R P J
authors.initials: RP
authors.lastname: Town
authors.forename: P A
authors.initials: PA
authors.lastname: Amendt
authors.forename: S P
authors.initials: SP
authors.lastname: Hatchett
authors.forename: O L
authors.initials: OL
authors.lastname: Landen
authors.forename: A J
authors.initials: AJ
authors.lastname: Mackinnon
authors.forename: P K
authors.initials: PK
authors.lastname: Patel
authors.forename: V A
authors.initials: VA
authors.lastname: Smalyuk
authors.forename: T C
authors.initials: TC
authors.lastname: Sangster
authors.forename: J P
authors.initials: JP
authors.lastname: Knauer