Superintensive Source of Electromagnetic Radiation
Experimental Demonstration of Producing 10 - 10W/cm Quasi-stationary Electromagnetic Field Sources for Fundamental Investigations of the Behavior of Matter in 10 - 10 V/cm Fields Part 2. Experimental and Theoretical Investigation of the
Tech Area / Field
- PHY-OPL/Optics and Lasers/Physics
3 Approved without Funding
VNIIEF, Russia, N. Novgorod reg., Sarov
- Lawrence Livermore National Laboratory, USA, CA, Livermore
Project summaryWithin the frameworks of ISTC Project #111 there have been demonstrated the principal possibility of superstrong quasi-stationary electromagnetic fields source creation. In accordance with the goal formulated in the agreement under the Project and as a result of the ISTC Project #111 execution, a facility has been created in RFNC-VNIIEF, including:
- master oscillator with the output beam of diffraction-limited quality,
- laser amplifier,
- phase conjugation device,
- target chamber with focusing parabolic mirror,
- diagnostic complex, which permits to register laser beam and plasma parameters.
In consequence of research carried out the following results have been obtained:
- the output laser energy of the facility ~ 100 J;
- the output pulse duration ~ 0.2 - 5 ns;
- the spot size on the target ~ 2 ~m;
- the field strength ~ 5 ґ 1010 V/cm have been registered during the experiments;
- numerical simulation of the short pulse propagation in the amplifying chain of the facility has demonstrated the principal possibility of obtaining more short, ~ 100 ps, output signals;
- the computation - theoretical model of matter behavior in quasi- stationary laser beams has been developed;
- the numerical experiments have shown, that while penetrating into superdense plasma, superstrong laser beams form a waveguide with the transverse size of the order of a wavelength.
At present such laser complex is a unique one in the world capable of carrying out a wide range of fundamental and applied research, which results will permit to advance in understanding of physics of matter behavior in the extreme conditions.
The proposed ISTC Project #1213 is the continuation of ISTC Project #111. The experiments in interaction between quasi- stationary superstrong laser beams (t ~ 100 - 200 ps, I ~ 1019 - 1021 W/cm2) with minimabtransverse size ~ 1 - 3 mm and matter should be the logical development of this facility creation. Testing of the theoretical models that were developed in many laboratories all over the world and determination of the fundamental features of matter behavior in superstrong fields are the main goals of this research. Plasma with the subcritical and overcritical electron density and electron beams will be used as the objects for research. Calculational - theoretical analysis of the scheduled forthcoming and already conducted experiments will be carried out during the Project execution. To that end a unique method of calculation of ponderomotive boring and of attendant processes ("Lambda" program), which was developed within the framework of ISTC Project #111 is supposed to be perfected by its supplementing with the models of X-ray and fast particles generation. Modernization of the facility is also supposed to improve the stability and to increase the generated fields intensity up to ~ 1021 W/cm2 by means of pulse energy increase, its duration reduction and focusing perfection. There will be numerically investigated the phase conjugation quality when using the transient SBS reflection as well as the effect of the spatial-temporal non-uniformity on the output signal temporal parameters. There will also be created and perfected the diagnostics method for registration of the fact of selfchanneling and dynamics of this process in plasma with high, ~ 20 ps temporal resolution.
The main results of the Project will be experimental and theoretical elucidation of the main features of laser beams selfchanneling in matter at superhigh laser intensities.
The main directions of the works:
- Experimental and numerical fundamental investigations on quasi stationary high intensity light beam interactions with matter on a test-bench created under the ISTC Project #111.
- The test-bench (HE iodine laser - target - interaction chamber) and diagnostic equipment performance.
- The investigations of possibility of facility scaling up to the output energy of 1 kJ and intensity on the target of 1021 W/cm2.
As a result of the research carried out it is supposed:
1. When investigating the interaction-between quasi- stationary superstrong laser beams with hard foils:
- to find the beams self-channeling features and to find the laser energy value sufficient to form channels with ~ 1 um diameter and length 10 - 50 mm;
- to determine the features of laser energy absorption and scattering as well as the conditions of fast particles generation with the energy і 1 MeV.
2. During interaction of quasi- stationary superstrong laser beams with subcritical plasma:
- to experimentally find critical values of intensity for various plasma concentrations ne/nc;
- to determine the maximal values of channeling length Lk and I -Lk depending on the ne/nc value.
3. When upgrading the laser facility:
- to improve the reproducibility of output beam parameters:
- intensity ~ 1019 - 1020 W/cm2;
- energy ~ 100 J;
- duration ~ 200 ps;
- spot size - 1 - 10 l,:
- to create and perfect the diagnostics method of registration of the self-channeling process in plasma with high (~ 20 ps) temporal resolution.
Technical approach and methodology
Scientific and technical prerequisites, which make it possible to actually solve the tasks of the Project are:
- successful fulfillment of the works under ISTC Project #111 which demonstrated the principal possibility of creating quasi-stationary superstrong laser beams with good output characteristics;
- availability of material base for carrying out research, including in particular:
- reference radiation generator with focusing system into a micrometer size spot; laser amplifiers system, phase conjugation device, interaction chamber; availability of superstrong laser beams characteristics (temporal shape, pulse contrast, transverse beam structure) control methods;- availability of apparatus and methods for registration of laser beam parameters and plasma diagnostics;
- existence of QSB-mater interaction unique computation method, developed within the framework of ISTC Project #111, which is supposed to be improved via its supplementing by models of X-rays and fast particles generation;
- RFNC-VNIIEF research group long experience in the field of phase conjugation under stimulated scattering in different media. Priority of the results obtained was fixed by awarding the scientists a state premium (including the Project participants - Drs. G.G.Kochemasov and S.A.Sukharev) in 1983;
- good results achieved by RFNC-VNIIEF research team in development of high power iodine laser systems, who were noted by awarding a state reward in 1997, including the Project participants V.A.Eroshenko, A.I.Zaretskii, A.V.Ryadov;
- involvement of specialists, highly skilled in experimental and computation research in the field of quantum electronics, radioelectronics, non-linear optics and physics of plasma (ref. to some works of Project participants [1 - 6]);
- involvement of experts in unique scientific equipment, experimental facilities and control systems development.
The project participants are interested in a wide collaboration with foreign partners in any forms such as, for example, regular exchange of scientific information and experimental techniques, discussion of results obtained at personal meetings. There is a possibility to carry out joint experiments as well.
List of the project participants' works abstracts
1. G.A.Kirillov, G.G.Kochemasov, S.M.Kulikov, S.N.Pevny, S.A.Sukharev, HE-pumped iodine laser for plasma and high intensity interactions, Report on the 12 International Conference "Laser Interactions and Related Plasma Phenomena -95", Osaka/Japan, April 24-28, 1995.
The amplifier channel energy of high power iodine laser pumped with light of the shock wave is treated. Conditions of focusing the phase-conjugated laser radiation, under which superhigh light field can be obtained, are discussed.
2. G.G.Kochemasov, S.M.Kulikov, S.A.Sukharev, High-power iodine lasers with phase conjugation / Report on the 8 International Conference "Lasers optics - 95", Sankt-Peterburg, Russia, June 27 -July 1, 1995. Report on the 4 International Workshop on iodine lasers and applications, Trest-Kastl, Czechija, September 18 - 21, 1995.
The operating at VNIIEE large-sized laser facilities and the VNIIEF advanced projects of laser facilities for ICF and fundamental physics investigations are discussed. Iodine laser and phase conjugation physics are treated. The monopulse laser channel with energy up to 10 kJ is created. The using of a HE-pumped iodine laser with phase conjugation (E ~ 70 kJ, t ~ 10-100 ps) is suggested as a possible way of solving the ICF problem in the fast ignition concept. It is suggested the way of quasi-stationary superhigh light field production by the focusing of power laser beams into supersmall volume (wave length order size).
3. S.M.Kulikov, Y.V.Dolgopolov, A.M.Dudov, V.A.Eroshenko, G.G.Kochemasov, S.N.Pevny, N.N.Rukavishnikov, A.B.Smirnov, S.P.Smyshlyaev, S.A.Sukharev, A.F.Shkapa "Progress in iodine laser for plasma and high intensity interactions", Report on the 24th European Conference on Laser Interaction with Matter (ECLIM), Madrid, Spain, June 3-7, 1996.
Results of development of a source of laser radiation focused in the wavelength size spot for obtaining quasistationary (t ~ 10-10 – 10-9 s) fields with intensity of 1020 - 1021 W/cm2 and for research of atoms in such fields are presented.
4. S.M.Kulikov, Y.V.Dolgopolov, G.G.Kochemasov, V.N.Novikov, S.A.Sukharev, S.N.Pevny, A.F.Shkapa, L.I.Zykov "Gas lasers with phase conjugation", Report on the International Conference on Laser and Electro-Optic Europe (CLEO-96), Hamburg, Germany, September 8-13, 1996.
A review is presented of researches carried out at Institute of Experimental physics on creation iodine and chemical lasers with SBS-mirrors.
5. S.M.Kulikov, Y.V. Dolgopolov, A.M.Dudov, V.A.Eroshenko, G.G.Kochemasov, S.N.Pevny, N.N.Rukavishnikov, A.B.Smirnov, S.P.Smyshlyaev, S.A.Sukharev, A.F.Shkapa "Advanced iodine laser for high intensity interactions", Report on the 13 International Conference "Laser Interactions and Related Plasma Phenomena", Monterey, USA, April 13-18, 1997.
The results concerning to development of laser radiation source focused in a region of wav elength order designated for obtaining the quasistationary (t ~ 10-10 – 10-9 s) fields with strength of 109 - 1010 V/cm to investigate atoms behavior in such fields is submitted.
6. Y.N.Eryomenko, L.S.Mkhitar'yan, "Scattering of relativistic electrons by high-power laser tightly focused", Zh.Eksp.Teor.Fiz., 111, 5, 1554-1562 (1997).
We obtain an approximate solution for the drift and oscillatory components of the motion of relativistic electrons in the field of temporary extended high-power laser light under strong focusing of the light (the size of the focal region is of the order of the light wavelength). This makes it possible to start numerically integrating the equations of electron motion near the focal region. We estimate the impact parameters of the electrons when they are still efficiently accelerated in the focal region.
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