Monte Carlo Simulation of Partially Ionized Hydrogen Plasmas

Cordes, C.; Bornath, Th.; Redmer, R.

doi:10.1002/ctpp.201600005

Cited by 3 publications

(6 citation statements)

References 41 publications

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“…The influence of the small fraction of hot electrons is neglected here. Modifications of the Thomson scattering signal in such two‐temperature systems were considered, e.g., in , .…”

Section: Dynamic Electron–electron Structure Factormentioning

confidence: 99%

“…As an alternative method to the HELIOS-CR simulations, we have performed Monte Carlo simulations. [58][59][60] The time evolution of the interaction of the laser pulse with the target is simulated as a uniform random sequence of events. The Gaussian shape of the laser pulse is divided into 10 time intervals, the number of photons in each interval is calculated via…”

Section: Monte Carlo Simulationmentioning

confidence: 99%

“…As an alternative method to the HELIOS‐CR simulations, we have performed Monte Carlo simulations . The time evolution of the interaction of the laser pulse with the target is simulated as a uniform random sequence of events.…”

Section: Monte Carlo Simulationmentioning

confidence: 99%

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Ionization dynamics of dense matter generated by intense ultrashort X‐ray pulses

Shihab

Bornath

Redmer

2019

Contributions to Plasma Physics

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We investigate a pump‐probe X‐ray Thomson scattering (XRTS) experiment that might be carried out at a free electron laser facility to study warm‐to‐hot states of dense matter. Ultrashort and intense X‐ray pulses with different energies (1,560–1,830 eV) heat a 1 µm thick Al target isochorically and create homogeneous and uncompressed warm‐to‐hot states of dense matter. A second pulse with variable delay probes this heated state via XRTS. The X‐ray laser–target interaction is modelled within radiation‐hydrodynamic simulations applying the HELIOS‐CR code. The HELIOS‐CR results qualitatively agree with Monte‐Carlo simulations, where the laser pulse absorption is simulated based on a uniform random sequence of events. The electron feature in the simultaneously observed X‐ray scattering spectrum is a function of the degree of ionization and the target temperature. Therefore, the temporal evolution of the plasmon peak measures the ionization dynamics on ultra‐short time scales. The XRTS spectrum is calculated based on the Chihara formula utilizing the Born‐Mermin approximation for the free electron dynamic structure factor. The proposed experiment will reveal important details of the ionization dynamics on ultra‐short time scales as well as of the relaxation on ps time scales.

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“…The influence of the small fraction of hot electrons is neglected here. Modifications of the Thomson scattering signal in such two‐temperature systems were considered, e.g., in , .…”

Section: Dynamic Electron–electron Structure Factormentioning

confidence: 99%

Section: Monte Carlo Simulationmentioning

confidence: 99%

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Ionization dynamics of dense matter generated by intense ultrashort X‐ray pulses

Shihab

Bornath

Redmer

2019

Contributions to Plasma Physics

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“…(5) is not applicable. Instead, one can use the nonequilibrium random phase approximation expression [1,44,45,46] for the DSF, S ee (k, ω, t) = S 0 ee (k, ω, t)/|ε RP A (k, ω, t)| 2 , with…”

Section: Theoretical Basicsmentioning

confidence: 99%

“…( 5) is not applicable. Instead, one can use the nonequilibrium random phase approximation expression [1,44,45,46] for the DSF,…”

Section: Theoretical Basicsmentioning

confidence: 99%

The interaction of intense ultrashort laser pulses with cryogenic He planar jets

Shihab

Bornath

Redmer

2017

Plasma Phys. Control. Fusion

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We study the interaction of intense ultrashort laser pulses with cryogenic He jets using 2d/3v relativistic Particle-in-Cell simulations (XOOPIC). Of particular interest are laser intensities (10 15 − 10 20 ) W/cm 2 , pulse lengths ≤ 100 fs, and the frequency regime ∼ 800 nm for which the jets are initially transparent and subsequently not homogeneously ionized. Pulses ≥ 10 16 W/cm 2 are found to drive ionization along the jet and outside the laser spot, the ionization-front propagates along the jet at a fraction of the speed of light. Within the ionized region, there is a highly transient field, which may be interpreted as two-surface wave decay and as a result of the chargeneutralizing disturbance at the jet-vacuum interface. The ionized region has solid-like densities and temperatures of few to hundreds of eV, i.e., warm and hot dense matter regimes. Such extreme conditions are relevant for high-energy densities as found, e.g., in shock-wave experiments and inertial confinement fusion studies. The temporal evolution of the ionization is studied considering theoretically a pump-probe x-ray Thomson scattering (XRTS) scheme. We observe plasmon and non-collective modes that are generated in the jet, and their amplitude is proportional to the ionized volume.Our theoretical findings could be tested at free-electron laser facilities such as FLASH and the European XFEL (Hamburg) and the LCLS (Stanford).Keywords: Warm and hot dense matter, pump-probe x-ray Thomson scattering experiments, dense plasma jets, two surface plasmon decay.

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