Optimization of a laser plasma-based x-ray source according to WDM absorption spectroscopy requirements

Abstract

X-ray absorption spectroscopy is a well-accepted diagnostic for experimental studies of warm dense matter. It requires a short-lived X-ray source of sufficiently high emissivity and without characteristic lines in the spectral range of interest. In the present work, we discuss how to choose an optimum material and thickness to get a bright source in the wavelength range 2 Å–6 Å (∼2 keV to 6 keV) by considering relatively low-Z elements. We demonstrate that the highest emissivity of solid aluminum and silicon foil targets irradiated with a 1-ps high-contrast sub-kJ laser pulse is achieved when the target thickness is close to 10 µm. An outer plastic layer can increase the emissivity even further.

Modeling of High-Energy Particles and Radiation Production for Multipetawatt Laser Facilities

“…Activation is mainly induced by two sources: the X-rays produced by energetic electrons through the Bremsstrahlung process in thick targets made of a heavy element (source TS1) and the protons accelerated to high energies from thin targets made of light elements (source TS2). ese two kinds of targets, used for photon [10] and proton sources [11][12][13], shown in Figure 1, are commonly used in experiments for X-ray radiography [14], proton radiography [15], opacity measurements, target heating [16], and for producing nuclear reactions [17].…”

Determining the short laser pulse contrast based on X-Ray emission spectroscopy

“…A more detailed scheme of the experiment is discussed in Ref. [16,17]. Solid Si foils of 0.5 μm thickness were used as targets.…”

Моделирование Рентгеновского Излучения Субпикосекундного Лазерно-Плазменного Рентгеновского Источника

“…Относительно недавно появились коды, которые позволяют самосогласованно учитывать рентгеновское излучение плазмы в PIC (particle in cell, частица в ячейке) расчете: EPOCH [19], OSIRIS [20], CALDER [21], PICLS [22], и другие [23], [24]. В работах [31][32][33] исследовался коэффициент конверсии фемтосекундного лазерного импульса в тормозное и синхротронное излучение для лазерных интенсивностей ∼ 10 23 W/cm 2 . В [23] и [27] рассматривался широкий набор лазерных интенсивностей (10 19 −10 24 W/cm 2 ).…”

“…длительности с плоскими мишенями различной толщины и для различных углов падения лазерного излучения. Результаты моделирования также сравниваются с экспериментальными измерениями, полученными на лазерной установке Вулкан [31].…”