title: Scaling hot-electron generation to high-power, kilojoule-class laser-solid interactions.
abstract: Thin-foil targets were irradiated with high-power (1 ≤ P(L) ≤ 210 TW), 10-ps pulses focused to intensities of I>10(18) W/cm(2) and studied with K-photon spectroscopy. Comparing the energy emitted in K photons to target-heating calculations shows a laser-energy-coupling efficiency to hot electrons of η(L-e) = 20 ± 10%. Time-resolved x-ray emission measurements suggest that laser energy is coupled to hot electrons over the entire duration of the incident laser drive. Comparison of the K-photon emission data to previous data at similar laser intensities shows that η(L-e) is independent of laser-pulse duration from 1 ≤ τ(p) ≤ 10 ps.
authors.affiliation: Fusion Science Center for Extreme States of Matter and Fast Ignition Physics, University of Rochester, Rochester, New York, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Nilson
authors.forename: A A
authors.initials: AA
authors.lastname: Solodov
authors.forename: J F
authors.initials: JF
authors.lastname: Myatt
authors.forename: W
authors.initials: W
authors.lastname: Theobald
authors.forename: P A
authors.initials: PA
authors.lastname: Jaanimagi
authors.forename: L
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authors.lastname: Gao
authors.forename: C
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authors.lastname: Stoeckl
authors.forename: R S
authors.initials: RS
authors.lastname: Craxton
authors.forename: J A
authors.initials: JA
authors.lastname: Delettrez
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authors.lastname: Yaakobi
authors.forename: J D
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authors.lastname: Zuegel
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authors.lastname: Kruschwitz
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authors.lastname: Dorrer
authors.forename: J H
authors.initials: JH
authors.lastname: Kelly
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authors.initials: KU
authors.lastname: Akli
authors.forename: P K
authors.initials: PK
authors.lastname: Patel
authors.forename: A J
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authors.lastname: Mackinnon
authors.forename: R
authors.initials: R
authors.lastname: Betti
authors.forename: T C
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authors.lastname: Sangster
authors.forename: D D
authors.initials: DD
authors.lastname: Meyerhofer