High resolution x-ray Thomson scattering measurements from cryogenic hydrogen jets using the linac coherent light source

Abstract

We present the first spectrally resolved measurements of x-rays scattered from cryogenic hydrogen jets in the single photon counting limit. The 120 Hz capabilities of the LCLS, together with a novel hydrogen jet design [J. B. Kim et al., Rev. Sci. Instrum. (these proceedings)], allow for the ability to record a near background free spectrum. Such high-dynamic-range x-ray scattering measurements enable a platform to study ultra-fast, laser-driven, heating dynamics of hydrogen plasmas. This measurement has been achieved using two highly annealed pyrolytic graphite crystal spectrometers to spectrally resolve 5.5 keV x-rays elastically and inelastically scattered from cryogenic hydrogen and focused on Cornell-SLAC pixel array detectors [S. Herrmann et al., Nucl. Instrum. Methods Phys. Res., Sect. A 718, 550 (2013)].

Electrostatic fluctuations in collisional plasmas

“…In the remaining theory we will use δñ t a (45), (46) to obtain the test particle correlation functions and after substituting them into (49) we will find the dynamical form factor for nonequilibrium plasmas.…”

“…By using Eqns. (45) and (40) we calculate the test density correlation functions < δn t e δn t e > k,ω = 2n e k 2 λ 2…”

“…An example in Fig. 6 illustrates results for the parameters of such experiment [45] where an X-ray beam (photon energy 5.…”

Assessment of Laser-Driven Pulsed Neutron Sources for Poolside Neutron-based Advanced NDE – A Pathway to LANSCE-like Characterization at INL

“…One of the authors of this report (S. Glenzer) participated in the development of a novel deuterium target design that may allow continuous operation of a laser-driven neutron source at 10 Hz [Kim 2016, Gauthier 2016, Fletcher 2016]. This design is described in detail in this section to illustrate that not only do pulsed lasers and pulsed neutron target/moderator systems exist, but also that technology to provide a continuous deuterium target is under development.…”

High repetition rate, multi-MeV proton source from cryogenic hydrogen jets

“…Additionally, planar hydrogen jets will be fielded to improve laser-jet overlap and potentially increase the shot-to-shot reproducibility of the proton energy spectra. This capability is ready for applications in pump-probe experiments 42 and the study of advanced proton acceleration mechanisms 19 at high repetition rates.…”