نتایج جستجو برای: ray laser
تعداد نتایج: 478312 فیلتر نتایج به سال:
We measure transient strain in ultrafast laser-excited Ge by time-resolved x-ray anomalous transmission. The development of the coherent strain pulse is dominated by rapid ambipolar diffusion. This pulse extends considerably longer than the laser penetration depth because the plasma initially propagates faster than the acoustic modes. X-ray diffraction simulations are in agreement with the obse...
Progress in construction and scaling of a repetitively pulsed, flash x-ray device producing intense nanosecond pulses is described. This source would be used to excite nuclear fluorescence for the evaluation of candidate materials for a gamma-ray laser. For some applications these devices can offer a table-top laboratory alternative to laser plasma x-rays and to synchrotron radiation.
We report soft X-ray interferograms that illustrate the use of a very compact table-top soft X-ray laser in mapping the electron density evolution of a dense plasma. The spatial density distribution of a point-focus laser-created plasma with 300 m dimension was measured for densities up to 6.5 1020 cm .
Recent transient collisional excitation x-ray laser experiments are reported using the COMET tabletop laser driver at the Lawrence Livermore National Laboratory (LLNL). Ne-like and Ni-like ion x-ray laser schemes have been investigated with a combination of long 600 ps and short ~1 ps high power laser pulses with 5 10 J total energy. We show small signal gain saturation for x-ray lasers when a ...
We present the first measurements of the angular dependence of the betatron x-ray spectrum produced by electrons inside the cavity of a laser-wakefield accelerator. Electrons accelerated up to 300 MeV energies produce a beam of broadband, forward-directed betatron x-ray radiation extending up to 80 keV. The angular resolved spectrum from an image plate-based spectrometer with differential filte...
We describe a new liquid-target system for low-debris laser-plasma soft x-ray sources. The system is based on a microscopic liquid jet and is experimentally evaluated for 0.7–1 keV proximity lithography and water-window x-ray microscopy applications. Compared to an existing liquid-droplet target, this target system has the same low debris emission, high x-ray photon flux, and narrow spectral ba...
We demonstrate the feasibility of Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy on solids by means of femtosecond soft x-ray pulses from a free-electron laser (FEL). Our experiments, carried out at the Free-Electron Laser at Hamburg (FLASH), used a special sample geometry, spectrographic energy dispersion, single shot position-sensitive detection and a data normalization proce...
The knowledge of the total yield of X-ray radiation is essential for evaluation of a feature of produced plasma and for characterization of different X-ray sources constructed on the basis of plasma facilities. There are some difficulties encountered when dealing with measurements of high fluxes of X-rays from such great plasma facilities as a 1 kJ laser system PALS (Prague Asterix Laser System...
An exciting new research facility is currently under construction in the Hamburg metropolitan region. Opening in 2017, the center will house the European XFEL X-ray laser, an apparatus generating ultra-short X-ray flashes – 27,000 times per second – with a brilliance that is a billion times higher than that of current conventional X-ray radiation sources. PC-based control and drive technology f...
Many advanced applications of X-ray free-electron lasers require pulse durations and time resolutions of only a few femtoseconds. To generate these pulses and to apply them in time-resolved experiments, synchronization techniques that can simultaneously lock all independent components, including all accelerator modules and all external optical lasers, to better than the delivered free-electron ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید