Abstract Details
| Presentation: | submitted: | by: |
|---|---|---|
| xrts_abstract_iched2009.pdf | 2009-04-21 14:52:38 | David Montgomery |
Imaging X-ray Thomson Scattering Development at Trident
Author: David S. Montgomery
Requested Type: Poster Only
Submitted: 2009-04-21 14:46:35
Co-authors: J.L. Kline, D.T. Offermann, T.E. Lockard, M.S. Murillo, I.M. Hall, S.A. Gaillard
Contact Info:
Los Alamos National Laboratory
PO Box 1663
Los Alamos, NM 87545
USA
Abstract Text:
X-ray Thomson scattering is a powerful technique to accurately measure conditions such as density, temperature, and ionization state in near-solid density plasmas. Such measurements are required to assess equation of state variables, for example, in the warm dense matter regime. Since the Thomson scattering cross-section is small, ~ 1e-28 m^2, and the number of x-ray probe photons at the scattering volume is limited, typically ~ 1e12 photons, high collection and detection efficiencies for the scattered x-rays are required. Experiments using x-ray Thomson scattering reported by other research groups utilized high-collection-efficiency x-ray spectrometers with high spectral resolution, but very poor spatial resolution. Thus, those experiments required fairly uniform conditions within the volume of dense plasma being probed.
In this present research, we report the development of a high-collection-efficiency toroidally curved imaging spectrometer, with high spectral and spatial resolution (ΔE ~ 2 eV, Δx < 20 µm) for x-ray photon energies in the 4 – 5 keV region. The spectrometer was fielded on the Trident laser at Los Alamos National Laboratory to demonstrate its resolution characteristics, and to demonstrate a proof-of-principle use of imaging x-ray Thomson scattering by nonuniformly heating a solid-density target. We report preliminary results from these experiments, and future prospects for this diagnostic capability.
Comments: