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Title: Modeling of Ni-like Molybdenum X-ray Laser by Ray Tracing Algorithm

Abstract

Ni-like Molybdenum plasma is modeled with atomic physics and hydrodynamic code EHYBRID. In the model the Molybdenum slab target is pumped with double pulse and 1054 nm Nd:Glass laser is used as the pumping laser. The most efficient plasma condition obtained with the configuration of a main pulse with 1.2 ps duration and 3.5x1014 Wcm-2 intensity pumped peak to peak 340 ps after a pre-pulse with the duration of 280 ps and intensity of 1.2x1012 Wcm-2 is concerned for the ray-tracing. The radial and transverse refraction of x-ray laser propagating along longitudinal axis of the plasma is calculated with the refraction equation numerically by Runge-Kutta method. The amplification of 18.9 nm Ni-like Molybdenum x-ray laser along its path through the plasma is modeled and the near-field image of the intensity at the exit of the plasma is obtained.

Authors:
;  [1];  [2]
  1. Zonguldak Karaelmas University, Department of Physics, Zonguldak (Turkey)
  2. University of Kocaeli, Department of Physics, Kocaeli (Turkey)
Publication Date:
OSTI Identifier:
21057155
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 899; Journal Issue: 1; Conference: 6. international conference of the Balkan Physical Union, Istanbul (Turkey), 22-26 Aug 2006; Other Information: DOI: 10.1063/1.2733168; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALGORITHMS; AMPLIFICATION; COMPUTERIZED SIMULATION; E CODES; HYDRODYNAMICS; IMAGES; MOLYBDENUM; MOLYBDENUM IONS; MULTICHARGED IONS; OPTICAL PUMPING; PLASMA; PULSES; REFRACTION; RUNGE-KUTTA METHOD; X-RAY LASERS

Citation Formats

Kurnali, S., Gueven, M. H., and Demir, A. Modeling of Ni-like Molybdenum X-ray Laser by Ray Tracing Algorithm. United States: N. p., 2007. Web. doi:10.1063/1.2733168.
Kurnali, S., Gueven, M. H., & Demir, A. Modeling of Ni-like Molybdenum X-ray Laser by Ray Tracing Algorithm. United States. doi:10.1063/1.2733168.
Kurnali, S., Gueven, M. H., and Demir, A. Mon . "Modeling of Ni-like Molybdenum X-ray Laser by Ray Tracing Algorithm". United States. doi:10.1063/1.2733168.
@article{osti_21057155,
title = {Modeling of Ni-like Molybdenum X-ray Laser by Ray Tracing Algorithm},
author = {Kurnali, S. and Gueven, M. H. and Demir, A.},
abstractNote = {Ni-like Molybdenum plasma is modeled with atomic physics and hydrodynamic code EHYBRID. In the model the Molybdenum slab target is pumped with double pulse and 1054 nm Nd:Glass laser is used as the pumping laser. The most efficient plasma condition obtained with the configuration of a main pulse with 1.2 ps duration and 3.5x1014 Wcm-2 intensity pumped peak to peak 340 ps after a pre-pulse with the duration of 280 ps and intensity of 1.2x1012 Wcm-2 is concerned for the ray-tracing. The radial and transverse refraction of x-ray laser propagating along longitudinal axis of the plasma is calculated with the refraction equation numerically by Runge-Kutta method. The amplification of 18.9 nm Ni-like Molybdenum x-ray laser along its path through the plasma is modeled and the near-field image of the intensity at the exit of the plasma is obtained.},
doi = {10.1063/1.2733168},
journal = {AIP Conference Proceedings},
number = 1,
volume = 899,
place = {United States},
year = {Mon Apr 23 00:00:00 EDT 2007},
month = {Mon Apr 23 00:00:00 EDT 2007}
}
  • This paper reports on the modeling of the Ni-like silver transient x-ray laser at the wavelength of 13.9 nm. Time-dependent populations and gain are calculated consistently with the output intensity. Two-dimensional refraction, i.e., in the direction of the driving laser and parallel to the slab target surface, is modeled by a ray trace code which is a postprocessor of a hydrodynamic code. Temperatures and electron-density variations are given by the hydrocode. Our calculations show that interaction of the x-ray laser field with the amplifying medium, and refraction, affect the output intensity and reduce the gain values by a large factor:more » from many hundreds per cm, as predicted by collisional-radiative models ignoring the above interaction, to one hundred per cm, at most.« less
  • We outline the results of experiments in the generation of X-ray laser radiation on the 4d - 4p Ni-like ion transitions at a wavelength {lambda} = 189 A under sequential irradiation of plane targets by two laser pulses focused to a line. These experiments were executed on the Sokol-p picosecond laser facility. The average energy of a 4-ps long ultrashort pump pulse was equal to 6.5 J, the energy of a 0.44-ns long prepulse was equal to 2.7 J, and the time delay between them was equal to 1.5 ns. The effective gain for short target lengths was equal tomore » {approx}24 cm{sup -1}. In the travelling pump wave regime, which was realised using a ladder mirror, we obtained an 8-fold increase in output X-ray laser energy in comparison with the output energy obtained in the ordinary target irradiation regime. (lasers)« less
  • A variant of a grazing-incidence pumping (GRIP) scheme for Ni-like x-ray lasers using a single shaped pulse from a 10-Hz Ti:sapphire laser system has been demonstrated. Experimental and numerical results show that efficient excitation leading to the lasing process can be achieved by controlled shaping of the pump laser pulse. Such a pulse has been defined for a silver slab target. A gain coefficient as high as 76 cm{sup -1} was estimated. Results indicate that the nanosecond amplified spontaneous emission background of the leading edge of the driving pulse is decisive for an efficient pumping process in this version ofmore » GRIP.« less
  • The gain is predicted for a solid molybdenum target illuminated by several joules of combined energy from a nanosecond laser pulse to create a preplasma followed by a picosecond laser pulse to drive the gain. Gains greater than 300cm{sup {minus}1} are predicted for the Ni-like Mo 4d{sup 1}S{sub 0}{r_arrow}4p{sup 1}P{sub 1} transition at 18.9 nm, which is driven by the monopole collisional excitation. High gain is also predicted for a self-photo-pumped 4f{sup 1}P{sub 1}{r_arrow}4d{sup 1}P{sub 1} transition at 22.0 nm and several other transitions driven by inner shell collisional ionization. {copyright} 1997 Optical Society of America
  • Some aspects of plasma kinetics in a Ni-like Ag soft x-ray laser have been analyzed, starting from the real shape of the pump laser pulse measured with a third-order correlator. The role for pump energy reduction of a complex pump pulse structure at a low intensity level has been identified, and the modeling results on the gain lifetime correspond well with the length of the output x-ray pulse measured in the experiment.