Hot surface ionic line emission and cold K-inner shell emission from petawatt-laser irradiated Cu foil targets
A hot, T{sub e} {approx} 2- to 3-keV 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 CCD 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 3 x 10{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 agreement with a model that includes refluxing and confinement of the suprathermal electrons in the target volume.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 898034
- Report Number(s):
- UCRL-JRNL-217895; TRN: US200706%%210
- Journal Information:
- Physics of Plasmas, vol. 13, N/A, April 18, 2006, pp. 043102, Journal Name: Physics of Plasmas, vol. 13, N/A, April 18, 2006, pp. 043102
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hot Surface Ionic Line Emission and Cold K-Inner Shell Emission from Petawatt-Laser-Irradiated Cu Foil Targets
Characteristics of high energy K{alpha} and Bremsstrahlung sources generated by short pulse petawatt lasers