X-ray radiation properties of plasma under interaction of femtosecond laser pulses with ∼1022 W/cm2 intensities

被引：0

作者：

Pikuz, S. A. ^{[1
,2
]}

Faenov, A. Ya. ^{[1
,3
]}

Pikuz, T. A. ^{[1
,4
]}

Skobelev, I. Yu. ^{[1
,2
]}

Alkhimova, M. A. ^{[1
,2
]}

Martynenko, A. S. ^{[1
,2
]}

Nishiuchi, M. ^{[5
]}

Sakaki, H. ^{[5
]}

Pirozhkov, A. S. ^{[5
]}

Sagisaka, A. ^{[5
]}

Dover, N. P. ^{[5
]}

Kondo, Ko. ^{[5
]}

Ogura, K. ^{[5
]}

Fukuda, Y. ^{[5
]}

Kiriyama, H. ^{[5
]}

Kando, M. ^{[5
]}

Sentoku, Y. ^{[6
]}

Hata, M. ^{[6
]}

Zigler, A. ^{[7
]}

Nishitani, K. ^{[9
]}

Miyahara, T. ^{[9
]}

Watanabe, Y. ^{[9
]}

Kodama, R. ^{[3
,4
,6
,8
]}

Kondo, K. ^{[5
]}

机构：

[1] Russian Acad Sci, Joint Inst High Temp, Moscow 125412, Russia

[2] Natl Res Nucl Univ MEPhI, Moscow 115409, Russia

[3] Osaka Univ, Open & Transdisciplinary Res Initiat, Suita, Osaka 5650871, Japan

[4] Osaka Univ, Grad Sch Engn, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan

[5] Kansai Photon Sci Inst QST, Kizugawa, Kyoto, Japan

[6] Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan

[7] Hebrew Univ Jerusalem, Racah Inst Phys, Jerusalem, Israel

[8] Osaka Univ, Photon Pioneers Ctr, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan

[9] Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Fukuoka, Fukuoka, Japan

来源：

2018 INTERNATIONAL CONFERENCE LASER OPTICS (ICLO 2018) | 2018年

基金：

日本科学技术振兴机构; 俄罗斯科学基金会; 日本学术振兴会;

关键词：

Strong field laser physics; X-ray spectroscopy; relativistic laser plasma/;

D O I：

暂无

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Study of radiation properties of solid dense plasma irradiated by ultraintense lasers has a great interest both from fundamental physics and different application point of views. Recently upgraded petawatt J-KAREN-P laser together with precise focusing technique delivers 35 fs laser pulses of 10(22) W/cm(2) intensity into a micron-size focal spot on target. For such unprecedented intensities the application of high-resolution Xray spectroscopy allows to investigate the ionization mechanisms and to measure the parameters of relativistic plasma from front and rear sides of moderate (Al) and high Z (Ti, Fe,) thin foil targets. Kinetic modeling of the spectra is used to estimate electron plasma density and temperature, demonstrating T-e similar to 2 keV for Ne similar to 5e22 cm(-3) in the hottest emission region. Thus, it is experimentally demonstrated for the first time that the laser pulse of over 1e21 W/cm(2) intensity is absorbed neither in the solid density plasma nor in a pre-plasma of a common critical density, but in the matter of so called relativistic critical density. It is revealed how even small displacement of the target out of the optimal laser focus, as well the decrease in temporal contrast of the laser pulse, strongly reduce both the intensity of X-ray radiation and degree of plasma ionization. 2D PIC code simulations of femtosecond laser interaction with various materials are provided and compared with experimental results.

引用

页码：234 / 234

页数：1