Monochromatic 2D Kα Emission Images Revealing Short-Pulse Laser Isochoric Heating Mechanism

Sawada, H.; Sentoku, Y.; Yabuuchi, T.; Zastrau, U.; Förster, E.; Beg, F. N.; Chen, H.; Kemp, A. J.; McLean, H. S.; Patel, P. K.; Ping, Y.

doi:10.1103/PhysRevLett.122.155002

Title: Monochromatic 2D $K α$ Emission Images Revealing Short-Pulse Laser Isochoric Heating Mechanism

Journal Article · Thu Apr 18 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.155002· OSTI ID:1597231

Sawada, H. ^[1]; Sentoku, Y. ^[2]; Yabuuchi, T. ^[3]; Zastrau, U. ^[4]; Förster, E. ^[5]; Beg, F. N. ^[6]; Chen, H. ^[7]; Kemp, A. J. ^[7]; McLean, H. S. ^[7]; Patel, P. K. ^[7]; Ping, Y. ^[7]

Univ. of Nevada, Reno, NV (United States)
Osaka Univ. (Japan)
RIKEN SPring-8 Center, Hyogo (Japan)
European XFEL, Schenefeld (Germany)
Friedrich-Schiller Univ. of Jena (Germany); Helmholtz Institute at Jena (Germany)
Univ. of California San Diego, La Jolla, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The rapid heating of a thin titanium foil by a high intensity, subpicosecond laser is studied by using a 2D narrow-band x-ray imaging and x-ray spectroscopy. Here, a novel monochromatic imaging diagnostic tuned to 4.51 keV Ti Kα was used to successfully visualize a significantly ionized area ( < Z > >17±1) of the solid density plasma to be within a ~35 μm diameter spot in the transverse direction and 2 μm in depth. The measurements and a 2D collisional particle-in-cell simulation reveal that, in the fast isochoric heating of solid foil by an intense laser light, such a high ionization state in solid titanium is achieved by thermal diffusion from the hot preplasma in a few picoseconds after the pulse ends. The shift of Kα and formation of a missing Kα cannot be explained with the present atomic physics model. The measured Kα image is reproduced only when a phenomenological model for the Kα shift with a threshold ionization of < Z > =17 is included. This work reveals how the ionization state and electron temperature of the isochorically heated nonequilibrium plasma are independently increased.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; SC0008827; NA0002075

OSTI ID:: 1597231

Alternate ID(s):: OSTI ID: 1507611

Report Number(s):: LLNL-JRNL-787896; PRLTAO; 981606; TRN: US2103059

Journal Information:: Physical Review Letters, Vol. 122, Issue 15; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Title: Monochromatic 2D $K α$ Emission Images Revealing Short-Pulse Laser Isochoric Heating Mechanism