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Time-dependent H-like and He-like Al lines produced by ultra-short pulse laser

Abstract

We have performed numerical modeling of time-resolved x-ray spectra from thin foil targets heated by the LLNL Ultra-short pulse (USP) laser. The targets were aluminum foils of thickness ranging from 250 A to 1250 A, heated with 120 fsec pulses of 400 nm light from the USP laser. The laser energy was approximately 0.2 Joules, focused to a 3 micron spot size for a peak intensity near 2 x 10{sup 19} W/cm{sup 2}. Ly{alpha} and He{alpha} lines were recorded using a 900 fsec x-ray streak camera. We calculate the effective ionization, recombination and emission rate coefficients including density effects for H-like and He-like aluminum ions using a collisional radiative model. We calculate time-dependent ion abundances using these effective ionization and recombination rate coefficients. The time-dependent electron temperature and density used in the calculation are based on an analytical model for the hydrodynamic expansion of the target foils. During the laser pulse the target is ionized. After the laser heating stops, the plasma begins to recombine. Using the calculated time dependent ion abundances and the effective emission rate coefficients, we calculate the time dependent Ly{alpha} and He{alpha} lines. The calculations reproduce the main qualitative features of the experimental spectra. (author)
Authors:
Kato, Takako; Kato, Masatoshi; [1]  Shepherd, R; Young, B; More, R; Osterheld, Al
  1. National Inst. for Fusion Science, Nagoya (Japan)
Publication Date:
Mar 01, 1998
Product Type:
Technical Report
Report Number:
JAERI-Conf-98-004; CONF-9707120-
Reference Number:
SCA: 665300; PA: JPN-98:011210; EDB-99:022032; SN: 99002049914
Resource Relation:
Conference: 1. JAERI-Kansai international workshop on ultrashort-pulse ultrahigh-power lasers and simulation for laser-plasma interactions, Kyoto (Japan), 14-18 Jul 1997; Other Information: PBD: Mar 1998; Related Information: Is Part Of Proceedings of the first JAERI-Kansai international workshop on ultrashort-pulse ultrahigh-power lasers and simulation for laser-plasma interactions; PB: 200 p.
Subject:
66 PHYSICS; LASERS; PULSES; X-RAY SPECTRA; IONIZATION; RECOMBINATION; ALUMINIUM IONS; THIN FILMS; PLASMA; EXPERIMENTAL DATA; ELECTRON TEMPERATURE
OSTI ID:
307668
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE99701543; TRN: JP9811210
Availability:
OSTI as DE99701543
Submitting Site:
JPN
Size:
pp. 82-87
Announcement Date:

Citation Formats

Kato, Takako, Kato, Masatoshi, Shepherd, R, Young, B, More, R, and Osterheld, Al. Time-dependent H-like and He-like Al lines produced by ultra-short pulse laser. Japan: N. p., 1998. Web.
Kato, Takako, Kato, Masatoshi, Shepherd, R, Young, B, More, R, & Osterheld, Al. Time-dependent H-like and He-like Al lines produced by ultra-short pulse laser. Japan.
Kato, Takako, Kato, Masatoshi, Shepherd, R, Young, B, More, R, and Osterheld, Al. 1998. "Time-dependent H-like and He-like Al lines produced by ultra-short pulse laser." Japan.
@misc{etde_307668,
title = {Time-dependent H-like and He-like Al lines produced by ultra-short pulse laser}
author = {Kato, Takako, Kato, Masatoshi, Shepherd, R, Young, B, More, R, and Osterheld, Al}
abstractNote = {We have performed numerical modeling of time-resolved x-ray spectra from thin foil targets heated by the LLNL Ultra-short pulse (USP) laser. The targets were aluminum foils of thickness ranging from 250 A to 1250 A, heated with 120 fsec pulses of 400 nm light from the USP laser. The laser energy was approximately 0.2 Joules, focused to a 3 micron spot size for a peak intensity near 2 x 10{sup 19} W/cm{sup 2}. Ly{alpha} and He{alpha} lines were recorded using a 900 fsec x-ray streak camera. We calculate the effective ionization, recombination and emission rate coefficients including density effects for H-like and He-like aluminum ions using a collisional radiative model. We calculate time-dependent ion abundances using these effective ionization and recombination rate coefficients. The time-dependent electron temperature and density used in the calculation are based on an analytical model for the hydrodynamic expansion of the target foils. During the laser pulse the target is ionized. After the laser heating stops, the plasma begins to recombine. Using the calculated time dependent ion abundances and the effective emission rate coefficients, we calculate the time dependent Ly{alpha} and He{alpha} lines. The calculations reproduce the main qualitative features of the experimental spectra. (author)}
place = {Japan}
year = {1998}
month = {Mar}
}