Abstract
Modelling plasma-based seeded soft X-ray lasers from the creation of the plasma to the propagation of a femtosecond high-order harmonic (HOH) seed throughout several millimetres of inhomogeneous plasma is a complex challenge. Different spatio-temporal scales from the hydrodynamic evolution of the plasma (hundreds of micrometres and nanoseconds) to the propagation of pulses through the plasma (millimetres and tens of picoseconds), electron collisions (picoseconds or even shorter) and the evolution of the envelope of the seeded HOH (tens of femtoseconds) must be tackled in order to fully understand these systems. In this paper, we will present the multi-scale computational paradigm that we have used to perform a full ab initio simulation of a dense, Ni-like Krypton plasma amplifier of soft X-rays. Results of the modelling and expected future applications will also be shown.
Highlights
Plasma-based seeded soft X-ray lasers [1,2] are a promising, compact source of coherent XUV and soft X-ray beams
We will present the suit of codes used to fully model plasma-based soft X-ray lasers. These codes allow us to study the different physical processes and their related spatio-temporal scales. This computational paradigm can be used to model different systems, like plasma amplifiers from gas or solid targets or even atmospheric lasing from plasma filaments
As an example of its capabilities, we will present the full modelling of a Krypton dense plasma amplifier seeded with high-order harmonics that demonstrated the delivery of sub-picosecond pulses [5]
Summary
Plasma-based seeded soft X-ray lasers [1,2] are a promising, compact source of coherent XUV and soft X-ray beams. Potential applications range from coherent imaging to warm dense matter [3] and plasma diagnosis [4] This source has demonstrated sub-picosecond amplification of high-order harmonics (HOH) [5] and the delivery of circularly polarized light [6]. We will present the suit of codes used to fully model plasma-based soft X-ray lasers These codes allow us to study the different physical processes (plasma hydrodynamics, atomic physics, interaction of lasers with plasmas, absorption/amplification of XUV and soft X-rays in plasmas) and their related spatio-temporal scales (from micrometres to centimetres and from femtoseconds to nanoseconds). We conclude with a resume of the current status of this multi-scale paradigm and future applications in plasma amplifiers and plasma diagnosis
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