skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Plasma and Shock Generation by Indirect Laser Pulse Action

Abstract

In the paper the results of our experiment with flyer disks, accelerated to high velocities by the PALS iodine laser and subsequently creating craters when hitting massive targets , are presented. We have carried out experiments with the double targets consisted of a disk placed in front of a massive target part at distances of either 200 or 500 {mu}m. Both elements of the targets were made of Al. The following disk irradiation conditions were used: laser energy of 130 J, laser wavelength of 1.315 {mu}m, pulse duration of 0.4 ns, and laser spot diameter of 250 {mu}m. To measure some plasma parameters and accelerated disk velocity a three frame interferometric system was used. Efficiency of crater creation by a disk impact was determined from the crater parameters, which were obtained by means of a crater replica technique. The experimental results concern two main stages: (a) ablative plasma generation and disk acceleration and (b) disk impact and crater creation. Spatial density distributions at different moments of plasma generation and expansion are shown. Discussion of the experimental results on the basis of a 2-D theoretical model of the laser -- solid target interaction is carried out.

Authors:
; ;  [1]; ;  [2]; ; ; ; ; ; ; ; ;  [3];  [4];  [3];  [5];  [6]
  1. Institute of Plasma Physics and Laser Microfusion, 23 Hery St., 00-908 Warsaw (Poland)
  2. P.N. Lebedev Physical Institute of RAS, 53 Leninsky Ave., 119 991 Moscow (Russian Federation)
  3. PALS Research Center, AS CR, Na Slovance 3, 182 00 Prague 8 (Czech Republic)
  4. Czech Technical University in Prague, FNSPE, Brehova 7, 115 19 Prague 1 (Czech Republic)
  5. (Czech Republic)
  6. Warsaw University of Technology, ICS, 15/19 Nowowiejska St., 00-665 Warsaw (Poland)
Publication Date:
OSTI Identifier:
20797918
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 812; Journal Issue: 1; Conference: PLASMA 2005: International conference on research and applications of plasmas; 3. German-Polish conference on plasma diagnostics for fusion and applications; 5. French-Polish seminar on thermal plasma in space and laboratory, Opole-Turawa (Poland), 6-9 Sep 2005; Other Information: DOI: 10.1063/1.2168843; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; CRATERS; DISTRIBUTION; EFFICIENCY; IODINE LASERS; IRRADIATION; PLASMA; PLASMA DIAGNOSTICS; PLASMA HEATING; PLASMA PRODUCTION; PULSES; REPLICA TECHNIQUES; SHOCK WAVES; WAVELENGTHS

Citation Formats

Kasperczuk, A., Borodziuk, S., Pisarczyk, T., Demchenko, N. N., Gus'kov, S. Yu., Jungwirth, K., Kralikova, B., Krousky, E., Masek, K., Pfeifer, M., Rohlena, K., Rozanov, V. B., Skala, J., Ullschmied, J., Kalal, M., Limpouch, J., Czech Technical University in Prague, FNSPE, Brehova 7, 115 19 Prague 1, and Pisarczyk, P.. Plasma and Shock Generation by Indirect Laser Pulse Action. United States: N. p., 2006. Web. doi:10.1063/1.2168843.
Kasperczuk, A., Borodziuk, S., Pisarczyk, T., Demchenko, N. N., Gus'kov, S. Yu., Jungwirth, K., Kralikova, B., Krousky, E., Masek, K., Pfeifer, M., Rohlena, K., Rozanov, V. B., Skala, J., Ullschmied, J., Kalal, M., Limpouch, J., Czech Technical University in Prague, FNSPE, Brehova 7, 115 19 Prague 1, & Pisarczyk, P.. Plasma and Shock Generation by Indirect Laser Pulse Action. United States. doi:10.1063/1.2168843.
Kasperczuk, A., Borodziuk, S., Pisarczyk, T., Demchenko, N. N., Gus'kov, S. Yu., Jungwirth, K., Kralikova, B., Krousky, E., Masek, K., Pfeifer, M., Rohlena, K., Rozanov, V. B., Skala, J., Ullschmied, J., Kalal, M., Limpouch, J., Czech Technical University in Prague, FNSPE, Brehova 7, 115 19 Prague 1, and Pisarczyk, P.. Sun . "Plasma and Shock Generation by Indirect Laser Pulse Action". United States. doi:10.1063/1.2168843.
@article{osti_20797918,
title = {Plasma and Shock Generation by Indirect Laser Pulse Action},
author = {Kasperczuk, A. and Borodziuk, S. and Pisarczyk, T. and Demchenko, N. N. and Gus'kov, S. Yu. and Jungwirth, K. and Kralikova, B. and Krousky, E. and Masek, K. and Pfeifer, M. and Rohlena, K. and Rozanov, V. B. and Skala, J. and Ullschmied, J. and Kalal, M. and Limpouch, J. and Czech Technical University in Prague, FNSPE, Brehova 7, 115 19 Prague 1 and Pisarczyk, P.},
abstractNote = {In the paper the results of our experiment with flyer disks, accelerated to high velocities by the PALS iodine laser and subsequently creating craters when hitting massive targets , are presented. We have carried out experiments with the double targets consisted of a disk placed in front of a massive target part at distances of either 200 or 500 {mu}m. Both elements of the targets were made of Al. The following disk irradiation conditions were used: laser energy of 130 J, laser wavelength of 1.315 {mu}m, pulse duration of 0.4 ns, and laser spot diameter of 250 {mu}m. To measure some plasma parameters and accelerated disk velocity a three frame interferometric system was used. Efficiency of crater creation by a disk impact was determined from the crater parameters, which were obtained by means of a crater replica technique. The experimental results concern two main stages: (a) ablative plasma generation and disk acceleration and (b) disk impact and crater creation. Spatial density distributions at different moments of plasma generation and expansion are shown. Discussion of the experimental results on the basis of a 2-D theoretical model of the laser -- solid target interaction is carried out.},
doi = {10.1063/1.2168843},
journal = {AIP Conference Proceedings},
number = 1,
volume = 812,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}
  • The theory of the generation of low-frequency radiation under the pondermotive action of a femtosecond laser pulse on dense hot plasma is developed. It is shown that, at fairly high plasma temperatures, when electron-electron collisions are rare and the low-frequency field is excited under conditions of the anomalous skin effect, the generation efficiency can be close to maximal. The optimal generation conditions are achieved if the carrier frequency of the laser pulse is close to the plasma frequency and the pulse is tightly focused. Under irradiation by pulses with durations of tens to hundreds femtoseconds, terahertz radiation is generated inmore » a broad angular range.« less
  • The dynamics of laser and X-ray radiation fields in experiments with cylindrical converter boxes (illuminators), which had earlier been carried out on the Iskra-5 laser facility (the second harmonic of iodine laser radiation, {lambda} = 0.66 {mu}m) was investigated in a sector approximation using the SND-LIRA numerical technique. In these experiments, the X-ray radiation temperature in the box was determined by measuring the velocity of the shock wave generated in the sample under investigation, which was located at the end of the cylindrical illuminator. Through simulations were made using the SND-LIRA code, which took into account the absorption of lasermore » driver radiation at the box walls, the production of quasithermal radiation, as well as the formation and propagation of the shock wave in the sample under investigation. An analysis of the experiments permits determining the electron thermal flux limiter f: for f = 0.03 it is possible to match the experimental scaling data for X-ray in-box radiation temperature to the data of our simulations. The shock velocities obtained from the simulations are also consistent with experimental data. In particular, in the experiment with six laser beams (and a laser energy E{sub L} = 1380 J introduced into the box) the velocity of the shock front (determined from the position of a laser mark) after passage through a 50-{mu}m thick base aluminium layer was equal to 35{+-}1.6 km s{sup -1}, and in simulations to 36 km s{sup -1}. In the experiment with four laser beams (for E{sub L} = 850 J) the shock velocity (measured from the difference of transit times through the base aluminium layer and an additional thin aluminium platelet) was equal to 30{+-}3.6 km s{sup -1}, and in simulations to 30 km s{sup -1}. (interaction of laser radiation with matter)« less
  • The impact and thermal action of laser sparks on the reflector of a laser engine in which the propulsion is produced by repetitively pulsed radiation is estimated. It is shown that for a low pulse repetition rate, the thermal contact of a plasma with the reflector and strong dynamic resonance loads are inevitable. These difficulties can be surmounted by using the method based on the merging of shock waves at a high pulse repetition rate. (laser applications)
  • The results of investigations are presented which are concerned with laser radiation absorption in a target, the plasma state of its ablated material, the energy transfer to the solid target material, the characteristics of the shock wave and craters on the target surface. The investigation involved irradiation of a planar target by a subnanosecond plasma-producing laser pulse. The experiments were carried out with massive aluminium targets using the PALS iodine laser, whose pulse duration (0.4 ns) was much shorter than the shock wave attenuation and on-target crater formation times (50-200 ns). The investigations were conducted for a laser radiation energymore » of 100 J at two wavelengths of 0.438 and 1.315 {mu}m. For a given pulse energy, the irradiation intensity was varied in a broad range (10{sup 13}-10{sup 16} W cm{sup -2}) by varying the radius of the laser beam. The efficiency of laser radiation-to-shock energy transfer was determined as a function of the intensity and wavelength of laser radiation; also determined were the characteristics of the plasma plume and the shock wave propagating in the solid target, including the experimental conditions under which two-dimensional effects are highly significant. (invited paper)« less
  • The propagation of ultrashort 10-{mu}m laser pulses of power exceeding the critical self-focusing power in xenon and air is numerically simulated. It is shown that the pulse duration in certain regimes in xenon can be decreased by 3-4 times simultaneously with the increase in the pulse power by 2-3 times. It is found that the average energy of electrons in a filament upon filamentation of 10-{mu}m laser pulses in air can exceed 200 eV. The features of the third harmonic and terahertz radiation generation upon filamentation are discussed. (special issue devoted to the 80th birthday of S.A. Akhmanov)