Pub Date : 1988-02-01DOI: 10.1017/S0263034600006005
L. Drska, J. Vondrášek
{"title":"Some aspects of the unified model of non-ideal high-parameter plasmas : electron EOS and conduction coefficients","authors":"L. Drska, J. Vondrášek","doi":"10.1017/S0263034600006005","DOIUrl":"https://doi.org/10.1017/S0263034600006005","url":null,"abstract":"","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"2013 1","pages":"164-184"},"PeriodicalIF":0.0,"publicationDate":"1988-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87898672","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}
Pub Date : 1988-02-01DOI: 10.1017/S0263034600006017
K. Mima, H. Takabe, S. Nakai
The conventional implosion scheme for high gain and high density compression depends upon the piston action of an accelerated heavy pusher. However, the contact surface between the pusher and the fuel layer is very unstable in the stagnation phase. In this paper, the laser pulse tailoring and the scaling laws for pellet gain, fuel ρ R , etc. are discussed under the condition of very weak piston action of the pusher. The scaling laws indicate that the fuel will be ignited by 100 kJ, 0·35 μm wavelength laser irradiation.
{"title":"Pusherless Implosion, Pulse Tailoring and Ignition Scaling Law for Laser Fusion","authors":"K. Mima, H. Takabe, S. Nakai","doi":"10.1017/S0263034600006017","DOIUrl":"https://doi.org/10.1017/S0263034600006017","url":null,"abstract":"The conventional implosion scheme for high gain and high density compression depends upon the piston action of an accelerated heavy pusher. However, the contact surface between the pusher and the fuel layer is very unstable in the stagnation phase. In this paper, the laser pulse tailoring and the scaling laws for pellet gain, fuel ρ R , etc. are discussed under the condition of very weak piston action of the pusher. The scaling laws indicate that the fuel will be ignited by 100 kJ, 0·35 μm wavelength laser irradiation.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"455 1","pages":"124-139"},"PeriodicalIF":0.0,"publicationDate":"1988-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76447158","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}
Pub Date : 1988-02-01DOI: 10.1017/S0263034600006054
K. Masugata, Hironobu Isobe, K. Aga, M. Matsumoto, S. Kawata, K. Yatsui
{"title":"Two-Dimensional Focusing of Self-Magnetically Insulated \"Plasma Focus Diode\"","authors":"K. Masugata, Hironobu Isobe, K. Aga, M. Matsumoto, S. Kawata, K. Yatsui","doi":"10.1017/S0263034600006054","DOIUrl":"https://doi.org/10.1017/S0263034600006054","url":null,"abstract":"","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"44 1","pages":"272-289"},"PeriodicalIF":0.0,"publicationDate":"1988-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79076848","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}
Pub Date : 1988-02-01DOI: 10.1017/S026303460000598X
Sanmartín, Juan
The fluid-dynamics of the corona ejected by laser-fusion targets in the direct-drive approach (thermal radiation and atomic physics unimportant) is discussed. A two-fluid model involves inverse bremsstrahlung absorption, refraction, different ion and electron temperatures with energy exchange, different ion and electron velocities and magnetic field generation, and their effect on ion-electron friction and heat flux. Four dimensionless parameters determine coronal regimes for one-dimensional flows under uniform irradiation. One additional parameter is involved in two-dimension al prob lems, including the stability of one-dimension al flows, and the smoothing of non uniform driving. We discuss here the fluid dynamics of the corona of fully ionized plasma ejected by a laser-irradiated target. The motivation of such a discussion is that, first, coronal flow is a special field in fluid dynamics, and, second, the variety of existing flow regimes needs to be explored prior to a full understanding of laser fusion, particularly of the compression of the imploding (part of the) target. We restrict our study to the direct-drive approach, for which thermal radiation and atomic physics play no dominant role. The special features of the corona are elaborated in Sec. 2. The equations involved in its analysis and the dimensionless parameters characterizing the coronal regimes are considered in Sees. 3 and 4 respectively. In the following section we review the limiting regimes and time behaviours for uniform laser irradiation, leading to one-dimension al problems described by systems of ordinary differential equations; their solutions involve non-linear eigenvalue determination and provide basic universal laws. In Sec. 6 we consider weakly two-dimensional problems that include the stability of 1-D flows, and the coronal smoothing of weakly non-uniform irradiation of targets. Some effects not included in the model of Sec. 3 are discussed in Sec. 7.
{"title":"Coronal fluid-dynamics in laser fusion","authors":"Sanmartín, Juan","doi":"10.1017/S026303460000598X","DOIUrl":"https://doi.org/10.1017/S026303460000598X","url":null,"abstract":"The fluid-dynamics of the corona ejected by laser-fusion targets in the direct-drive approach (thermal radiation and atomic physics unimportant) is discussed. A two-fluid model involves inverse bremsstrahlung absorption, refraction, different ion and electron temperatures with energy exchange, different ion and electron velocities and magnetic field generation, and their effect on ion-electron friction and heat flux. Four dimensionless parameters determine coronal regimes for one-dimensional flows under uniform irradiation. One additional parameter is involved in two-dimension al prob lems, including the stability of one-dimension al flows, and the smoothing of non uniform driving. We discuss here the fluid dynamics of the corona of fully ionized plasma ejected by a laser-irradiated target. The motivation of such a discussion is that, first, coronal flow is a special field in fluid dynamics, and, second, the variety of existing flow regimes needs to be explored prior to a full understanding of laser fusion, particularly of the compression of the imploding (part of the) target. We restrict our study to the direct-drive approach, for which thermal radiation and atomic physics play no dominant role. The special features of the corona are elaborated in Sec. 2. The equations involved in its analysis and the dimensionless parameters characterizing the coronal regimes are considered in Sees. 3 and 4 respectively. In the following section we review the limiting regimes and time behaviours for uniform laser irradiation, leading to one-dimension al problems described by systems of ordinary differential equations; their solutions involve non-linear eigenvalue determination and provide basic universal laws. In Sec. 6 we consider weakly two-dimensional problems that include the stability of 1-D flows, and the coronal smoothing of weakly non-uniform irradiation of targets. Some effects not included in the model of Sec. 3 are discussed in Sec. 7.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"29 1","pages":"193-212"},"PeriodicalIF":0.0,"publicationDate":"1988-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84426098","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}
Pub Date : 1988-02-01DOI: 10.1017/S0263034600006030
S. Kawata, M. Matsumoto, Y. Masubuchi
The interaction between particles and an electromagnetic (EM) wave is investigated numerically in the system of particle V p × B acceleration by the EM wave. Numerical simulations show that the particle acceleration mechanism works well in the case of the appropriate number density of the imposed particles. When the interaction between particles and the wave is too strong, a part of the trapped and accelerated particles is detrapped. A condition is also presented for the efficient particle acceleration and trapping by the EM wave.
用数值方法研究了电磁波对粒子V p × B加速系统中粒子与电磁波的相互作用。数值模拟结果表明，在适当的粒子密度下，粒子加速机制可以很好地发挥作用。当粒子与波之间的相互作用太强时，一部分被捕获和加速的粒子被脱去。给出了电磁波有效加速和捕获粒子的条件。
{"title":"NUMERICAL SIMULATION FOR PARTICLE ACCELERATION AND TRAPPING BY AN ELECTROMAGNETIC WAVE","authors":"S. Kawata, M. Matsumoto, Y. Masubuchi","doi":"10.1017/S0263034600006030","DOIUrl":"https://doi.org/10.1017/S0263034600006030","url":null,"abstract":"The interaction between particles and an electromagnetic (EM) wave is investigated numerically in the system of particle V p × B acceleration by the EM wave. Numerical simulations show that the particle acceleration mechanism works well in the case of the appropriate number density of the imposed particles. When the interaction between particles and the wave is too strong, a part of the trapped and accelerated particles is detrapped. A condition is also presented for the efficient particle acceleration and trapping by the EM wave.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"859 1","pages":"81-101"},"PeriodicalIF":0.0,"publicationDate":"1988-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88415000","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}
It is shown by theory and fully relativistic, electromagnetic particle simulation that a collisionless fast magnetosonic shock wave can promptly accelerate protons and electrons to relativistic energies; proton energies greater than about 10 to the 9th eV and electron energies greater than about 10 to the 6th eV. The time needed for the proton acceleration is of the order of the ion cyclotron period and is quite short (much less than 1 s for solar plasmas). The electron acceleration time is shorter than the ion cyclotron period. The present shock acceleration mechanism can explain important features of observed particle acceleration in the impulsive phase of solar flares; simultaneous and prompt acceleration of protons and electrons to relativistic energies. 31 references.
{"title":"PROMPT SIMULTANEOUS ACCELERATION OF PROTONS AND ELECTRONS TO RELATIVISTIC ENERGIES BY SHOCK WAVES IN SOLAR FLARES","authors":"Y. Ohsawa, J. Sakai","doi":"10.1086/166668","DOIUrl":"https://doi.org/10.1086/166668","url":null,"abstract":"It is shown by theory and fully relativistic, electromagnetic particle simulation that a collisionless fast magnetosonic shock wave can promptly accelerate protons and electrons to relativistic energies; proton energies greater than about 10 to the 9th eV and electron energies greater than about 10 to the 6th eV. The time needed for the proton acceleration is of the order of the ion cyclotron period and is quite short (much less than 1 s for solar plasmas). The electron acceleration time is shorter than the ion cyclotron period. The present shock acceleration mechanism can explain important features of observed particle acceleration in the impulsive phase of solar flares; simultaneous and prompt acceleration of protons and electrons to relativistic energies. 31 references.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"67 1","pages":"1-26"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81182596","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}
Nonlinear coupled equations describing the low frequency interchange modes in a plasma with small fraction of the hot electron component are derived on the basis of multi-fluid equations. Stationary vortex solutions in a long wavelength limit are obtained in a plasma stabilized by the charge unconvering effect instead of the finite Larmor radius effect. The solution takes a form of a pair of localized vortices, rotating in opposite directions and moving with a constant velocity in direction perpendicular to the magnetic field. Linear dispersion relation is studied in detail. The dispersion relation of vortex, relating the propagation velocity to the core size of vortex is examined for typical parameters in bumpy torus experiments. Consequently, the positive and negative branches of the propagation velocity for the fixed size of vortex are also found.
{"title":"Long Wavelength Vortices of Low Frequency Interchange Modes","authors":"V. Pavlenko, H. Sanuki","doi":"10.1143/JPSJ.57.516","DOIUrl":"https://doi.org/10.1143/JPSJ.57.516","url":null,"abstract":"Nonlinear coupled equations describing the low frequency interchange modes in a plasma with small fraction of the hot electron component are derived on the basis of multi-fluid equations. Stationary vortex solutions in a long wavelength limit are obtained in a plasma stabilized by the charge unconvering effect instead of the finite Larmor radius effect. The solution takes a form of a pair of localized vortices, rotating in opposite directions and moving with a constant velocity in direction perpendicular to the magnetic field. Linear dispersion relation is studied in detail. The dispersion relation of vortex, relating the propagation velocity to the core size of vortex is examined for typical parameters in bumpy torus experiments. Consequently, the positive and negative branches of the propagation velocity for the fixed size of vortex are also found.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"1 1","pages":"1-21"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85079354","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}
Pub Date : 1987-04-01DOI: 10.1016/0375-9601(87)90069-7
T. Hashino, S. Nakazaki, T. Kato, Hiromachi Kashiwabara
{"title":"Energy Eigenvalues of Helium-Like Atoms in Dense Plasmas","authors":"T. Hashino, S. Nakazaki, T. Kato, Hiromachi Kashiwabara","doi":"10.1016/0375-9601(87)90069-7","DOIUrl":"https://doi.org/10.1016/0375-9601(87)90069-7","url":null,"abstract":"","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"27 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"1987-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91314658","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}
On trouve que la fonction de correlation en temps de la vitesse decroit en loi de puissance pour l'orbite gouvernee par un hamiltonien, H=v 2 /2−Mcosx−Pcos[k(x−t)]
{"title":"Long-Time Correlation for the Chaotic Orbit in the Two-Wave Hamiltonian","authors":"T. Hatori, H. Irie","doi":"10.1143/PTP.78.249","DOIUrl":"https://doi.org/10.1143/PTP.78.249","url":null,"abstract":"On trouve que la fonction de correlation en temps de la vitesse decroit en loi de puissance pour l'orbite gouvernee par un hamiltonien, H=v 2 /2−Mcosx−Pcos[k(x−t)]","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"41 1","pages":"2-35"},"PeriodicalIF":0.0,"publicationDate":"1987-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87423446","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：