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Influence of hot electrons on the spectra of iron plasma irradiated by femtosecond laser pulses with 1021 W/cm2 intensities

Published online by Cambridge University Press:  04 January 2017

A. Stafford ,
A.S. Safronova ,
A.Ya. Faenov ,
T.A. Pikuz ,
R. Kodama ,
V.L. Kantsyrev ,
I. Shrestha  and
V.V. Shlyaptseva
A. Stafford*
Affiliation:
Physics Department, University of Nevada, Reno, NV 89557, USA
A.S. Safronova
Affiliation:
Physics Department, University of Nevada, Reno, NV 89557, USA
A.Ya. Faenov
Affiliation:
Institute for Academic Initiatives, Osaka University, Suita, Osaka 565-0871, Japan Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow 125412, Russia
T.A. Pikuz
Affiliation:
Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow 125412, Russia PPC and Graduate School of Engineering, Osaka University, Suita, Osaka 565-087, Japan
R. Kodama
Affiliation:
Institute for Academic Initiatives, Osaka University, Suita, Osaka 565-0871, Japan PPC and Graduate School of Engineering, Osaka University, Suita, Osaka 565-087, Japan
V.L. Kantsyrev
Affiliation:
Physics Department, University of Nevada, Reno, NV 89557, USA
I. Shrestha
Affiliation:
Physics Department, University of Nevada, Reno, NV 89557, USA
V.V. Shlyaptseva
Affiliation:
Physics Department, University of Nevada, Reno, NV 89557, USA
*
Address correspondence and reprint requests to: A. Stafford, Department of Physics, University of Nevada, (0220) 1664 N. Virginia St. Reno, NV 89557, USA. E-mail: [email protected]
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Abstract

The use of laboratory experiments as plasma creating sources is a valuable tool for understanding astrophysical observations. Recently plasma created through irradiation by lasers with relativistic intensities has been used to study effects of hot electrons and X-ray pumping on X-ray formation of multiply charged ions spectra. This paper discusses the formation of K-shell Fe spectra recorded from a plasma irradiated by 35 fs pulses with intensities of 1021 W/cm2. Modeling of the spectra suggests three different regions of plasma radiation including a cold ~10 eV region, a mild ~700 eV region, and a hot ~3500 eV region. The influence of hot electrons and X-ray pumping is discussed and a comparison with K-shell Fe spectra from a 1 MA X-pinch experiment is included to highlight the differences due to the shorter time frame of the laser–plasma interaction experiment.

Keywords

Relativistic laser plasmaX-ray sourcesX-ray spectroscopy
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 1 , March 2017 , pp. 92 - 99
Copyright
Copyright © Cambridge University Press 2017 

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