Photo-ionized neon plasmas induced by radiation pulses of a laser-plasma EUV source and a free electron laser FLASH

被引：32

作者：

Bartnik, A. ^{[1
]}

Fedosejevs, R. ^{[2
]}

Wachulak, P. ^{[1
]}

Fiedorowicz, H. ^{[1
]}

Serbanescu, C. ^{[2
]}

Saiz, E. G. ^{[3
]}

Riley, D. ^{[3
]}

Toleikis, S. ^{[4
]}

Neely, D. ^{[5
]}

机构：

[1] Mil Univ Technol, Inst Optoelect, PL-00908 Warsaw, Poland

[2] Univ Alberta, Edmonton, AB, Canada

[3] Queens Univ Belfast, Ctr Plasma Phys, Belfast, Antrim, North Ireland

[4] DESY, Hamburg, Germany

[5] Rutherford Appleton Lab, Ctr Laser Facil, Oxford, England

来源：

LASER AND PARTICLE BEAMS | 2013年 / 31卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

Extreme ultraviolet; Free electron laser; Laser plasma; Photo-ionization; PHOTOIONIZATION EXPERIMENTS; SURFACE; DRIVEN;

D O I：

10.1017/S0263034613000050

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this work, a laser-produced plasma extreme ultraviolet source and a free electron laser were used to create Ne photo-ionized plasmas. In both cases, a radiation beam was focused onto a gas stream injected into a vacuum chamber synchronously with the radiation pulse. Extreme ultraviolet radiation from the plasma spanned a wide spectral range with pronounced maximum centered at lambda = 11 +/- 1 nm while the free electron laser pulses were emitted at a wavelength of 32 nm. The power density of the focused plasma radiation was approximately 2 x 10(7) W/cm(2) and was seven orders of magnitude lower compared with the focused free electron laser beam. Radiation fluences in both experimental conditions were comparable. Despite quite different spectral characteristics and extremely different power densities, emission spectra of both photo-ionized plasmas consist of the same spectral lines within a wavelength range of 20 to 50 nm, however, with different relative intensities of the corresponding lines. The dominating spectral lines originated from singly charged ions (Ne II); however, Ne III lines were also detected. Additionally, computer simulations of the emission spectra, obtained for photo-ionized plasmas, driven by the plasma extreme ultraviolet source, were performed. The corresponding measured and calculated spectra are presented. An electron temperature and ionic composition were estimated. Differences between the experimental spectra, obtained for both irradiation conditions, were analyzed. The differences were attributed mainly to different energies of driving photons.

引用

页码：195 / 201

页数：7

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