Time-resolved Kα spectroscopy measurements of hot-electron equilibration dynamics in thin-foil solid targets: collisional and collective effects. (25th September 2015)

• Record Type: Journal Article
• Authors: Nilson, P M; Solodov, A A; Davies, J R; Theobald, W; Mileham, C; Stoeckl, C; Begishev, I A; Zuegel, J D; Froula, D H; Betti, R; Meyerhofer, D D
• Is Part Of: Journal of physics. Volume 48:Number 22(2015:Nov. 15)
• Publication Date: 2015-09-25
• Subjects: K-shell spectroscopy -- high-intensity laser -- plasma; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/0953-4075/48/22/224001
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: Time-resolved K α spectroscopy measurements from high-intensity laser interactions with thin-foil solid targets are reviewed. Thin Cu foils were irradiated with 1−10 J, 1 ps pulses at focused intensities from 10 18 to 10 19 W cm −2 . The experimental data show K α -emission pulse widths from 3 to 6 ps, increasing with laser intensity. The time-resolved K α -emission data are compared to a hot-electron transport and K α -production model that includes collisional electron–energy coupling, resistive heating, and electromagnetic field effects. The experimental data show good agreement with the model when a reduced ponderomotive scaling is used to describe the initial mean hot-electron energy over the relevant intensity range.