Hot surface ionic line emission and cold K-inner shell emission from petawatt-laser-irradiated Cu foil targets

Journal Article · Sat Apr 15 00:00:00 EDT 2006 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2188912· OSTI ID:20782757

Theobald, W; Delettrez, J A; Mileham, C; Myatt, J; Regan, S P; Sawada, H; Stoeckl, C; Storm, M; Sangster, T C ^[1]; Akli, K; King, J A; Zhang, B ^[2]; Clarke, R; Green, J; Heathcote, R; Lancaster, K; Neely, D; Norreys, P A ^[3]; Freeman, R R ^[4]; Glenzer, S ^[5]

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1. Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299 (United States)
2. Department of Applied Sciences, University of California, Davis, Davis, California 95616 (United States)
3. Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX (United Kingdom)
4. College of Mathematical and Physical Sciences, Ohio State University, Columbus, Ohio 43210 (United States)
5. Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, California 94550-9234 (United States)

A hot, 2 to 3 keV electron temperature surface plasma was observed in the interaction of a 0.7 ps petawatt laser beam with solid copper-foil targets at intensities >10{sup 20} W/cm{sup 2}. Copper K-shell spectra were measured in the range of 8 to 9 keV using a single-photon-counting x-ray charged-coupled-device camera. In addition to K{sub {alpha}} and K{sub {beta}} inner-shell lines, the emission contained the Cu He{sub {alpha}} and Ly{sub {alpha}} lines, allowing the temperature to be inferred. These lines have not been observed previously with ultrafast laser pulses. For intensities less than 3x10{sup 18} W/cm{sup 2}, only the K{sub {alpha}} and K{sub {beta}} inner-shell emissions are detected. Measurements of the absolute K{sub {alpha}} yield as a function of the laser intensity are in general agreement with a model that includes refluxing and confinement of the suprathermal electrons in the target volume.

• OSTI ID: 20782757
• Journal Information: Physics of Plasmas, Vol. 13, Issue 4; Other Information: DOI: 10.1063/1.2188912; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COPPER
ELECTRON TEMPERATURE
ELECTRONS
EMISSION
FOILS
ION TEMPERATURE
IRRADIATION
K SHELL
KEV RANGE
LASER-PRODUCED PLASMA
LASERS
PETAWATT POWER RANGE
PHOTONS
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA PRODUCTION
PULSES
RADIATION TRANSPORT
X RADIATION
X-RAY SOURCES