A5075109529- Laser Design and Applications
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Particle Detector Development and Performance
- X-ray Spectroscopy and Fluorescence Analysis
- Laser-induced spectroscopy and plasma
- Advanced X-ray Imaging Techniques
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Scientific Measurement and Uncertainty Evaluation
- Laser Material Processing Techniques
Queen's University Belfast
2022-2024
We describe laboratory experiments to generate x-ray photoionized plasmas of relevance accretion-powered sources such as neutron star binaries and quasars, with significant improvements over previous work. A key quantity is referenced, namely the photoionization parameter, defined ξ=4πF/ne where F flux ne electron density. This normally meaningful in an astrophysical steady-state context, but also commonly used literature a figure merit for that are, necessity, time-dependent. demonstrate...
We present results from a pilot study, using laser-produced plasma, to identify new lines in the 350 1000 nm spectral region for r-process element gold (Au), of relevance studies neutron star mergers. This was achieved via optical-IR spectroscopy Au with an target high purity (99.95 %) and low vacuum pressure remove any air contamination experimental spectra. Our data were recorded spectrometer 750 mm focal length 1200 mm-1 grating, yielding resolution 0.04 nm. find 54 not previously...
We describe laboratory experiments to generate X-ray photoionized plasmas of relevance accretion-powered sources such as neutron star binaries and quasars, with significant improvements over previous work. A key quantity is referenced, namely the photoionization parameter. This normally meaningful in an astrophysical steady-state context, but also commonly used literature a figure merit for that are, necessity, time-dependent. demonstrate emission-weighted values {\xi} > 50 ergcm/s using...
We describe laboratory experiments to generate x-ray photoionized plasmas of relevance accretion-powered sources such as neutron star binaries and quasars, with significant improvements over previous work. refer a key quantity, the photoionization parameter, defined [[EQUATION]] where F is flux ne electron density. This usually meaningful in steady state context, but commonly used, literature, figure merit for that are, necessity, time dependent. demonstrate we can achieve values erg-cm s-1...
We have employed the VULCAN laser facility to generate a plasma X-ray source for use in photoionization experiments. A nanosecond pulse with an intensity of order 10 15 Wcm −2 was used irradiate thin Ag or Sn foil targets coated onto parylene substrate, and L-shell emission 3.3–4.4 keV range recorded both laser-irradiated nonirradiated sides. Both experimental simulation results show higher conversion yields compared Sn, our simulations indicating approximately factor two than those found...
We have employed the VULCAN laser facility to generate a plasma X-ray source for use in photoionisation experiments. A nanosecond pulse with an intensity of order ${10}^{15}$ W{cm}$^{-2}$ was used irradiate thin Ag or Sn foil targets coated onto parylene substrate, and L-shell emission $3.3-4.4$ keV range recorded both laser-irradiated non-irradiated sides. Both experimental simulation results show higher conversion yields compared Sn, our simulations indicating approximately factor two than...