Conveners
4.3 Radiation Physics & X-ray Lasers and 4.5 Laser Produced Plasmas
- Remington Reid (US AFRL)
Achieving higher fuel efficiency and reducing NO$_x$ emissions from internal combustion engines and gas turbine requires operation at lower equivalence ratios, when ignition and flameholding may become unstable. A similar problem occurs during ignition of supersonic flows, when ignition delay time may become comparable with the flow residence time and fuel-air mixing time in the combustor....
The European XFEL is a superconducting, radio-frequency free-electron laser simultaneously operating three variable-gap undulator SASE beamlines. Each beamline supplies two instruments with X-rays of up to 25 keV photon energy. One of them, the High Energy Density (HED) scientific instrument, will be a unique platform to generate and investigate matter under extreme conditions of pressure,...
We have been studying the dynamics and overall features of laser produced annular plasma expanding in background gases. The initial plasma is produced by focusing a Nd:YAG laser beam (1064 nm, 3.5 ns FWHM, $\sim10^{10}$W/cm$^2$) onto a flat target employing a combination of a 10 mrad axicon prism and a converging lens, which results in an initial ring-like shape plasma of 1 mm radius and...
The HEAVEN-I KrF excimer laser facility is the Chinese largest krypton fluoride laser facility, housed at the China Institute of Atomic Energy, Beijing, China. There were 6 laser beams at this facility, combined energy up to 100 J with a pulse width of 28 ns at a wavelength of 248 nm. The uniformity distribution of laser intensity is less than 2\%. The diameter of the focal spots was about...
Recently, hard x-ray characteristic lines from high Z materials produced from pulsed power plasmas have been studied: as signatures of hot electrons using Mo K-alpha emission from Mo nested wire arrays on SNL-Z [1], Cu and Zn K-alpha emission from brass planar wire arrays on UNR’s Zebra generator [2], and as a new hard x-ray spectroscopic diagnostic for the direct measurement of the ionization...
