P. Naik, S. R. Kumbhare, V. Arora, R. Joshi, P. Gupta
Gain measurements in x-ray lasers involves monitoring the intensity of lasing transition as a function of line focus length. Having a line focus of variable length with uniform intensity is important in these measurements. In addition, uniform line focusing of Gaussian laser beams has many other applications in material processing, pumping of dye lasers etc. In this paper, we describe a simple technique using a wedge to displace and overlap two halves of a Gaussian laser beam to obtain a uniform intensity line focus. Variation of the line length at a fixed intensity is facilitated by use of appropriate masks. X-ray emission pictures of a line focused laser produced plasma show the effectiveness of this geometry.
{"title":"A novel geometry for uniform intensity line focus of Gaussian laser beams","authors":"P. Naik, S. R. Kumbhare, V. Arora, R. Joshi, P. Gupta","doi":"10.1117/12.537395","DOIUrl":"https://doi.org/10.1117/12.537395","url":null,"abstract":"Gain measurements in x-ray lasers involves monitoring the intensity of lasing transition as a function of line focus length. Having a line focus of variable length with uniform intensity is important in these measurements. In addition, uniform line focusing of Gaussian laser beams has many other applications in material processing, pumping of dye lasers etc. In this paper, we describe a simple technique using a wedge to displace and overlap two halves of a Gaussian laser beam to obtain a uniform intensity line focus. Variation of the line length at a fixed intensity is facilitated by use of appropriate masks. X-ray emission pictures of a line focused laser produced plasma show the effectiveness of this geometry.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126189568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The implosion of an indirectly driven optimized capsule for ICF is analyzed. We distinguish two media in the non-ablated capsule: the central hot spot and the cold shell, the boundary of the hot spot is defined such that this medium has no heat conduction losses, the features of each medium are described by mean quantities. The integral momentum conservation equation for volume of variable mass gives the rocket model for the acceleration phase, it is corrected to take into account the beginning of the acceleration. With approximations it gives the maximum implosion velocity. The entropy conservation is generalized for a non uniform medium of variable mass, it indicates what is the invariant quantity hidden in the hot spot during implosion and shows that the deceleration is approximately isobaric. The hot spot features and the implosion velocity in deceleration can be deduced from these results. The hot spot mass is obtained by integrating the heat conduction flux inside the hot spot. In the capsule parameters determining the ignition condition, the mass and the entropy of gas has to be included. All these results are compared with numerical simulations.
{"title":"Implosion theory and hot spot features for an indirectly driven optimized capsule","authors":"Y. Saillard","doi":"10.1117/12.536753","DOIUrl":"https://doi.org/10.1117/12.536753","url":null,"abstract":"The implosion of an indirectly driven optimized capsule for ICF is analyzed. We distinguish two media in the non-ablated capsule: the central hot spot and the cold shell, the boundary of the hot spot is defined such that this medium has no heat conduction losses, the features of each medium are described by mean quantities. The integral momentum conservation equation for volume of variable mass gives the rocket model for the acceleration phase, it is corrected to take into account the beginning of the acceleration. With approximations it gives the maximum implosion velocity. The entropy conservation is generalized for a non uniform medium of variable mass, it indicates what is the invariant quantity hidden in the hot spot during implosion and shows that the deceleration is approximately isobaric. The hot spot features and the implosion velocity in deceleration can be deduced from these results. The hot spot mass is obtained by integrating the heat conduction flux inside the hot spot. In the capsule parameters determining the ignition condition, the mass and the entropy of gas has to be included. All these results are compared with numerical simulations.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134154432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Romanov, Yuriy V. Korobkin, Aleksey S. Kishinets, A. Rupasov, A. S. Shikanov, A. Moorti, P. Naik, P. Gupta
Instabilities of the discharge, as well as temporal and energetic characteristics of x-ray radiation a source based on the vacuum diode with laser-plasma cathode in a wide range of energies, power densities, duration of plasma forming laser pulse, have been experimentally studied. It has been observed that the characteristics of laser radiation significantly affect the dynamics of vacuum discharge and allow to control radiation processes at the early stages of its development. The minimum recorded duration of x-ray pulse (with photon number 1011 per pulse) in titanium K-shells (~4.5 keV) was 10 ns in the case of generation of plasma cathode using laser radiation with the duration of 27 ps and intensity ~1013 W/cm2. It has been established that in the regime of instability suppression and at the application of accelerating voltage (about 3 - 4 times the excitation threshold), the maximum value of contrast of characteristic radiation over Bremsstrahlung is achieved.
{"title":"Features of the electrical current in an x-ray source based on a vacuum diode with a laser-plasma cathode","authors":"I. Romanov, Yuriy V. Korobkin, Aleksey S. Kishinets, A. Rupasov, A. S. Shikanov, A. Moorti, P. Naik, P. Gupta","doi":"10.1117/12.537381","DOIUrl":"https://doi.org/10.1117/12.537381","url":null,"abstract":"Instabilities of the discharge, as well as temporal and energetic characteristics of x-ray radiation a source based on the vacuum diode with laser-plasma cathode in a wide range of energies, power densities, duration of plasma forming laser pulse, have been experimentally studied. It has been observed that the characteristics of laser radiation significantly affect the dynamics of vacuum discharge and allow to control radiation processes at the early stages of its development. The minimum recorded duration of x-ray pulse (with photon number 1011 per pulse) in titanium K-shells (~4.5 keV) was 10 ns in the case of generation of plasma cathode using laser radiation with the duration of 27 ps and intensity ~1013 W/cm2. It has been established that in the regime of instability suppression and at the application of accelerating voltage (about 3 - 4 times the excitation threshold), the maximum value of contrast of characteristic radiation over Bremsstrahlung is achieved.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133882541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Masayuki Suzuki, H. Daido, F. Matsuoka, E. Yanase, M. Nishiuchi, K. Suto, A. Sasaki, K. Yamakawa, T. Kawachi, K. Nagashima, T. Oketa, T. Nakayama, I. Uschmann, E. Foerster, H. Fiedorowicz
The soft x-ray emission from He-like and H-like were obtained by using the double nozzle gas-puff (Nitrogen, and Oxygen) target irradiated by the laser which delivered a laser energy of 50 mJ in 400 ps pulse width. Efficient absorption of the incident laser energy into the double gas-puff target was demonstrated experimentally such as 15%, and 29% for Nitrogen and Oxygen, respectively. The sub keV x-ray emission from He-β(1s2-1s2p, 1s2-1s3p, and 1s2-1s4p) lines are observed around the 0.4 nm wavelength region by using the double nozzle Argon gas-puff target irradiated by a 5 J, 1 ns, 1 μm laser. Using the gas-puff target irradiated by a femto-second laser pulse, highly ionized ions of Cr-, Fe- and Ni-like Kr at the 5 - 20 nm wavelength region have been observed in a laser produced plasma. However, the intensity of the x-ray emissions from double nozzle gas-puff target are lower than that from the single nozzle gas-puff targets, using the Krypton gas. Using xenon gas, the intensity of the x-ray emissions from double nozzle gas-puff target is equivalent to that from the single nozzle target.
{"title":"X-ray spectroscopic study on femto- and pico-second laser irradiated solid and gaseous targets","authors":"Masayuki Suzuki, H. Daido, F. Matsuoka, E. Yanase, M. Nishiuchi, K. Suto, A. Sasaki, K. Yamakawa, T. Kawachi, K. Nagashima, T. Oketa, T. Nakayama, I. Uschmann, E. Foerster, H. Fiedorowicz","doi":"10.1117/12.536791","DOIUrl":"https://doi.org/10.1117/12.536791","url":null,"abstract":"The soft x-ray emission from He-like and H-like were obtained by using the double nozzle gas-puff (Nitrogen, and Oxygen) target irradiated by the laser which delivered a laser energy of 50 mJ in 400 ps pulse width. Efficient absorption of the incident laser energy into the double gas-puff target was demonstrated experimentally such as 15%, and 29% for Nitrogen and Oxygen, respectively. The sub keV x-ray emission from He-β(1s2-1s2p, 1s2-1s3p, and 1s2-1s4p) lines are observed around the 0.4 nm wavelength region by using the double nozzle Argon gas-puff target irradiated by a 5 J, 1 ns, 1 μm laser. Using the gas-puff target irradiated by a femto-second laser pulse, highly ionized ions of Cr-, Fe- and Ni-like Kr at the 5 - 20 nm wavelength region have been observed in a laser produced plasma. However, the intensity of the x-ray emissions from double nozzle gas-puff target are lower than that from the single nozzle gas-puff targets, using the Krypton gas. Using xenon gas, the intensity of the x-ray emissions from double nozzle gas-puff target is equivalent to that from the single nozzle target.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133556276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Sakagami, H. Yoshida, Ryouhei Ito, Tomohito Terasawa, Takafumi Fuseya, Koichiro Awano, Fukutaro Mayumi, K. Murase, H. Kato, Shin'ichi Sato, Yu Yamahira
In laser fusion experiments, for uniform irradiation, a stalk that supports a pellet affects uniformity. In our laboratory, we are studying non-contact suspension technique in the following four directions. First, we are introducing Magnetically Suspended Pellet (MSP) of a Ni coated Glass Micro Balloon (Ni-GMB) in high vacuum. Small external disturbances, however, cause it to vibrate horizontally. We have shown the effectiveness of active damping by use of optical forces. As another new method, we propose stabilization by rotation of Ni-GMB itself. Secondly, electric suspension system for a transparent GMB of laser fusion has been studied using RE-QTDQ (ring electrode quasi three dimensional quadrupole). Optical forces effect in electric suspension is experimentally confirmed. Thirdly, we are studying fundamentals of acoustic levitation. Lastly, a Pulsed Laser Deposition (PLD) enables us to have a uniform Ni coat over a laser fusion pellet. In heat-resister vacuum deposition method, we find gravitational effect of droplets and threshold distance of clean film. We have shown the pattern projection method is simple and effective to measure a PMB thickness.
{"title":"Development of noncontact suspension technique of a pellet for laser fusion","authors":"Y. Sakagami, H. Yoshida, Ryouhei Ito, Tomohito Terasawa, Takafumi Fuseya, Koichiro Awano, Fukutaro Mayumi, K. Murase, H. Kato, Shin'ichi Sato, Yu Yamahira","doi":"10.1117/12.537449","DOIUrl":"https://doi.org/10.1117/12.537449","url":null,"abstract":"In laser fusion experiments, for uniform irradiation, a stalk that supports a pellet affects uniformity. In our laboratory, we are studying non-contact suspension technique in the following four directions. First, we are introducing Magnetically Suspended Pellet (MSP) of a Ni coated Glass Micro Balloon (Ni-GMB) in high vacuum. Small external disturbances, however, cause it to vibrate horizontally. We have shown the effectiveness of active damping by use of optical forces. As another new method, we propose stabilization by rotation of Ni-GMB itself. Secondly, electric suspension system for a transparent GMB of laser fusion has been studied using RE-QTDQ (ring electrode quasi three dimensional quadrupole). Optical forces effect in electric suspension is experimentally confirmed. Thirdly, we are studying fundamentals of acoustic levitation. Lastly, a Pulsed Laser Deposition (PLD) enables us to have a uniform Ni coat over a laser fusion pellet. In heat-resister vacuum deposition method, we find gravitational effect of droplets and threshold distance of clean film. We have shown the pattern projection method is simple and effective to measure a PMB thickness.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121124657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Hathiramani, H. Brauning, A. Diehl, A. Narits, L. Presnyakov, P. Scheier, A. Theiss, Roland H. Trassl, E. Salzborn
Employing the crossed-beams technique, we have studied the interaction of fullerene ions both with electrons and He2+ ions. For fullerene ions C60q+ (q = 1,2,3), absolute cross sections have been measured for C2-fragmentation at electron energies up to 1 keV. The cross sections for the loss of a C2 molecule indicate the presence of two different mechanisms. For negatively-charged fullerene ions Cm- (m = 60, 70, 84), absolute cross sections for multiple-ionization and fragmentation into product ions Cm-nq+ (q = 1,2,3 and n = 0,2,3) have been measured in the same range of electron energies. A novel ionization mechanism is proposed. In a very first ion-ion crossed-beams experiment involving fullerene ions, we have studied the charge transfer in collisions between C60+ ions and He2+ ions at keV energies. We have also calculated the total cross section for this reaction. Where the fullerene ion is described as an infinitely conducting hard sphere (ICS). The charge transfer S-matrix element was calculated as the electron transition coefficient over the time-dependent potential. For the calculation of the transition coefficients over a non-symmetric barrier, a new efficient method was developed.
{"title":"Investigation of fullerenes in crossed-beam experiments","authors":"D. Hathiramani, H. Brauning, A. Diehl, A. Narits, L. Presnyakov, P. Scheier, A. Theiss, Roland H. Trassl, E. Salzborn","doi":"10.1117/12.537114","DOIUrl":"https://doi.org/10.1117/12.537114","url":null,"abstract":"Employing the crossed-beams technique, we have studied the interaction of fullerene ions both with electrons and He2+ ions. For fullerene ions C60q+ (q = 1,2,3), absolute cross sections have been measured for C2-fragmentation at electron energies up to 1 keV. The cross sections for the loss of a C2 molecule indicate the presence of two different mechanisms. For negatively-charged fullerene ions Cm- (m = 60, 70, 84), absolute cross sections for multiple-ionization and fragmentation into product ions Cm-nq+ (q = 1,2,3 and n = 0,2,3) have been measured in the same range of electron energies. A novel ionization mechanism is proposed. In a very first ion-ion crossed-beams experiment involving fullerene ions, we have studied the charge transfer in collisions between C60+ ions and He2+ ions at keV energies. We have also calculated the total cross section for this reaction. Where the fullerene ion is described as an infinitely conducting hard sphere (ICS). The charge transfer S-matrix element was calculated as the electron transition coefficient over the time-dependent potential. For the calculation of the transition coefficients over a non-symmetric barrier, a new efficient method was developed.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116061884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Rupasov, E. Bolkhovitinov, I. Y. Doskach, A. Erokhin, S. I. Fedotov, L. Feoktistov, S. Gus'kov, B. V. Kruglov, M. V. Osipov, V. N. Puzirev, V. Rozanov, A. S. Shikanov, V. Studenov, B. L. Vasin, O. Yakushev
The results of experimental and theoretical investigations of craters originating in solid targets of different materials when powerful Nd:glass laser pulse irradiates the surface at flux densities in the range of 1010 - 1014 W/cm2 are presented. The experimentally observed dependencies of crater depth and ablated mass on laser pulse energy and target material properties are analyzed employing the theory of shock wave initiation and propagation under the action of the plasma-producing laser beam. From the comparison of the theoretically deduced and experimentally observed dependencies, a simple formula is derived allowing to determine the pressures in the shock wave and in the plasma corona using the measurements for the crater depth and ablated mass.
{"title":"Features of crater formation on a target under the action of powerful laser pulse","authors":"A. Rupasov, E. Bolkhovitinov, I. Y. Doskach, A. Erokhin, S. I. Fedotov, L. Feoktistov, S. Gus'kov, B. V. Kruglov, M. V. Osipov, V. N. Puzirev, V. Rozanov, A. S. Shikanov, V. Studenov, B. L. Vasin, O. Yakushev","doi":"10.1117/12.536466","DOIUrl":"https://doi.org/10.1117/12.536466","url":null,"abstract":"The results of experimental and theoretical investigations of craters originating in solid targets of different materials when powerful Nd:glass laser pulse irradiates the surface at flux densities in the range of 1010 - 1014 W/cm2 are presented. The experimentally observed dependencies of crater depth and ablated mass on laser pulse energy and target material properties are analyzed employing the theory of shock wave initiation and propagation under the action of the plasma-producing laser beam. From the comparison of the theoretically deduced and experimentally observed dependencies, a simple formula is derived allowing to determine the pressures in the shock wave and in the plasma corona using the measurements for the crater depth and ablated mass.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126695367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper presents a review of recent studies of plasmas produced in various experimental conditions performed mainly at the IPPLM and partially at the PALS Joint Research Laboratory ASCR in Prague in an international cooperation. These investigations were directed towards the clarification of the physical processes in such plasmas as well as at the optimization of sources of multi-charged ions for various applications. A 1-ps terawatt Nd:glass laser system (pulse energy up to 1 J, wavelength: 1053 nm, power density up to 1017 W/cm2) was employed for the experiments carried out at the IPPLM in Warsaw. Also, an option of this system operating with the 0.5 ns pulse (power density up to 1014 W/cm2) for comparative studies was used. In common experiments at the PALS JRL in Prague we used the PALS iodine laser system producing up to 1.2 kJ in a 0.4 ns pulse at 1315 nm wavelength or 0.25 kJ at 438 nm (third harmonic) wavelengths. The time-of-flight measuring systems namely: different ion collectors and an electrostatic ion energy analyzer were employed as main diagnostic methods. The properties of ion emission were investigated at various experimental conditions with the use of different massive and thin foil targets.
{"title":"Review of studies of ion streams produced by short high-intensity laser pulses performed by the IPPLM team","authors":"Z. Skladanowski, J. Badziak, J. Wołowski","doi":"10.1117/12.536774","DOIUrl":"https://doi.org/10.1117/12.536774","url":null,"abstract":"The paper presents a review of recent studies of plasmas produced in various experimental conditions performed mainly at the IPPLM and partially at the PALS Joint Research Laboratory ASCR in Prague in an international cooperation. These investigations were directed towards the clarification of the physical processes in such plasmas as well as at the optimization of sources of multi-charged ions for various applications. A 1-ps terawatt Nd:glass laser system (pulse energy up to 1 J, wavelength: 1053 nm, power density up to 1017 W/cm2) was employed for the experiments carried out at the IPPLM in Warsaw. Also, an option of this system operating with the 0.5 ns pulse (power density up to 1014 W/cm2) for comparative studies was used. In common experiments at the PALS JRL in Prague we used the PALS iodine laser system producing up to 1.2 kJ in a 0.4 ns pulse at 1315 nm wavelength or 0.25 kJ at 438 nm (third harmonic) wavelengths. The time-of-flight measuring systems namely: different ion collectors and an electrostatic ion energy analyzer were employed as main diagnostic methods. The properties of ion emission were investigated at various experimental conditions with the use of different massive and thin foil targets.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125667694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We consider a physical model of the interaction of high-power laser pulses with plasma created upon irradiation of condensed targets. The model is based on the equations of single-fluid, two-temperature hydrodynamics taking into account the ponderomotive force and the Maxwell equations for laser radiation at oblique incidence in the cases of s- and p-polarizations. The model takes into account the generation of fast electrons in the conditions of plasma resonance at the critical surface, and their transport with consideration for the friction force, caused by the ionization losses. For a number of experiments we have performed the numerical modeling of the laser picosecond pulse interaction with targets. We present the interpretation of the experiment on the basic harmonic shift depending on the pre-pulse energy. It has been shown that, if under the irradiation of a deuterated target the pre-pulse energy grows, the neutron yield of DD-reactions diminishes, since the produced plasma prevents the heating of the dense part of the target. It has been also shown that the growth of the pre-pulse energy can provoke, due to the induced scattering, the losses in the main pulse radiation. We give interpretation of the experimental data on the picosecond pulse absorption by plasma at the flux density of 1016-1019 W/cm2.
{"title":"Simulation of hydrodynamic phenomena caused by prepulse in picosecond laser-plasma interaction","authors":"N. Demchenko, V. Rozanov","doi":"10.1117/12.536882","DOIUrl":"https://doi.org/10.1117/12.536882","url":null,"abstract":"We consider a physical model of the interaction of high-power laser pulses with plasma created upon irradiation of condensed targets. The model is based on the equations of single-fluid, two-temperature hydrodynamics taking into account the ponderomotive force and the Maxwell equations for laser radiation at oblique incidence in the cases of s- and p-polarizations. The model takes into account the generation of fast electrons in the conditions of plasma resonance at the critical surface, and their transport with consideration for the friction force, caused by the ionization losses. For a number of experiments we have performed the numerical modeling of the laser picosecond pulse interaction with targets. We present the interpretation of the experiment on the basic harmonic shift depending on the pre-pulse energy. It has been shown that, if under the irradiation of a deuterated target the pre-pulse energy grows, the neutron yield of DD-reactions diminishes, since the produced plasma prevents the heating of the dense part of the target. It has been also shown that the growth of the pre-pulse energy can provoke, due to the induced scattering, the losses in the main pulse radiation. We give interpretation of the experimental data on the picosecond pulse absorption by plasma at the flux density of 1016-1019 W/cm2.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121266822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Limpouch, O. Renner, E. Krousky, B. Králiková, J. Skála, E. Forster, A. Lübcke, I. Uschmann, A. Iskakov, L. Kocbach, P. A. Loboda, V. Popova, I. Litvinenko
K-shell emission spectra from laser-exploded aluminum foils and mylar foils with aluminum dots are recorded with a high spectral and spatial resolution using vertical-geometry Johann spectrometer. The experiments are modelled using cylindrical version of two-dimensional hydrocode "ATLANT." We describe our novel atomic physics post-processor "XEPAP" that is used here for the synthesis of the emission spectra. The predictions of the simulations are compared with the experimental spectra and the parameters of the emitting plasmas are deduced.
{"title":"X-ray emission diagnostics of the densest part of plasma at laser-exploded foils","authors":"J. Limpouch, O. Renner, E. Krousky, B. Králiková, J. Skála, E. Forster, A. Lübcke, I. Uschmann, A. Iskakov, L. Kocbach, P. A. Loboda, V. Popova, I. Litvinenko","doi":"10.1117/12.537271","DOIUrl":"https://doi.org/10.1117/12.537271","url":null,"abstract":"K-shell emission spectra from laser-exploded aluminum foils and mylar foils with aluminum dots are recorded with a high spectral and spatial resolution using vertical-geometry Johann spectrometer. The experiments are modelled using cylindrical version of two-dimensional hydrocode \"ATLANT.\" We describe our novel atomic physics post-processor \"XEPAP\" that is used here for the synthesis of the emission spectra. The predictions of the simulations are compared with the experimental spectra and the parameters of the emitting plasmas are deduced.","PeriodicalId":340981,"journal":{"name":"European Conference on Laser Interaction with Matter","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134473309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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