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Title: Characterization of transient gain x-ray lasers

Abstract

We have performed numerical simulations of the transient collisional excitation Ni-like Pd 4d {r_arrow} 4p J = 0 {r_arrow} 1 147 {angstrom} laser transition recently observed at Lawrence Livermore National Laboratory (LLNL). The high gain {approximately}35 cm results from the experiment are compared with detailed modeling simulations from the 1-D RADEX code in order to better understand the main physics issues affecting the measured gain and x-ray laser propagation along the plasma column. Simulations indicate that the transient gain lifetime associated with the short pulse pumping and refraction of the x-ray laser beam out of the gain region are the main detrimental effects. Gain lifetimes of {approximately}7 ps(1/e decay) are inferred from the smoothly changing gain experimental observations and are in good agreement with the simulations. Furthermore, the modeling results indicate the presence of a longer-lived but lower gain later in time associated with the transition from transient to quasi-steady state excitation.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
14737
Report Number(s):
UCRL-JC-133237; YN0100000; 97-ERD-105
YN0100000; 97-ERD-105; TRN: US0106229
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 6th International Conference on X-Ray Lasers, Kyoto (JP), 08/31/1999--09/04/1999; Other Information: PBD: 7 Feb 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DECAY; EXCITATION; LASER-PRODUCED PLASMA; OPTICAL PUMPING; REFRACTION; TRANSIENTS; X-RAY LASERS; COMPUTERIZED SIMULATION; PALLADIUM; GAIN; R CODES

Citation Formats

Dunn, J, Osterheld, A, and Shlyaptsev, V. Characterization of transient gain x-ray lasers. United States: N. p., 1999. Web.
Dunn, J, Osterheld, A, & Shlyaptsev, V. Characterization of transient gain x-ray lasers. United States.
Dunn, J, Osterheld, A, and Shlyaptsev, V. Sun . "Characterization of transient gain x-ray lasers". United States. https://www.osti.gov/servlets/purl/14737.
@article{osti_14737,
title = {Characterization of transient gain x-ray lasers},
author = {Dunn, J and Osterheld, A and Shlyaptsev, V},
abstractNote = {We have performed numerical simulations of the transient collisional excitation Ni-like Pd 4d {r_arrow} 4p J = 0 {r_arrow} 1 147 {angstrom} laser transition recently observed at Lawrence Livermore National Laboratory (LLNL). The high gain {approximately}35 cm results from the experiment are compared with detailed modeling simulations from the 1-D RADEX code in order to better understand the main physics issues affecting the measured gain and x-ray laser propagation along the plasma column. Simulations indicate that the transient gain lifetime associated with the short pulse pumping and refraction of the x-ray laser beam out of the gain region are the main detrimental effects. Gain lifetimes of {approximately}7 ps(1/e decay) are inferred from the smoothly changing gain experimental observations and are in good agreement with the simulations. Furthermore, the modeling results indicate the presence of a longer-lived but lower gain later in time associated with the transition from transient to quasi-steady state excitation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {2}
}

Conference:
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