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Kink Stability of Long Ion Layers 长离子层的扭结稳定性
The annual research report Pub Date : 1986-08-01 DOI: 10.1063/1.865551
A. Ishida
{"title":"Kink Stability of Long Ion Layers","authors":"A. Ishida","doi":"10.1063/1.865551","DOIUrl":"https://doi.org/10.1063/1.865551","url":null,"abstract":"By means of the two‐fluid model, the kink stability of a long thin field‐reversed ion layer immersed in a dense low‐temperature background plasma is studied theoretically. The two‐fluid variational quadratic form with the assumption of rigid displacements in the radial direction yields a new kink stability condition that includes the effect of the nonzero real frequency of the modes, which results from the inertia of the ion layer. Although it was neglected in previous analyses, this effect is essential to explain the numerical results of Harned [Phys. Fluids 25, 1915 (1982)]. As the ratio of the density of the background plasma to that of the ion layer increases, this new kink stability condition reduces to the conventional condition. The physical mechanism for the kink instability is discussed by means of an analogy with the electrostatic two‐stream instability.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"27 1","pages":"1-28"},"PeriodicalIF":0.0,"publicationDate":"1986-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78150777","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}
引用次数: 2
A Solitary Wave of a Relativistic Magnetosonic Wave Propagating Perpendicularly to a Magnetic Field 垂直于磁场传播的相对论磁声波的孤波
The annual research report Pub Date : 1986-03-01 DOI: 10.1063/1.865540
Y. Ohsawa
{"title":"A Solitary Wave of a Relativistic Magnetosonic Wave Propagating Perpendicularly to a Magnetic Field","authors":"Y. Ohsawa","doi":"10.1063/1.865540","DOIUrl":"https://doi.org/10.1063/1.865540","url":null,"abstract":"A relativistic theory for a nonlinear magnetosonic wave propagating perpendicularly to a magnetic field is developed. On the basis of a relativistic two‐fluid cold plasma model, the structure of a stationary magnetosonic wave is studied. Relativistic effects become important for the parameter regime ωce/ωpe≳1, because the fluid electron velocity perpendicular to a magnetic field and parallel to the wave front takes values close to the speed of light for such plasma parameters. It is found that there exists a stationary solitary wave solution even in the relativistic model. Some properties of the solitary wave, such as the soliton width, are discussed.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"4 1","pages":"1-22"},"PeriodicalIF":0.0,"publicationDate":"1986-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86169707","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}
引用次数: 50
Non-stochastic prompt proton acceleration by fast magnetosonic shocks in the solar plasma 太阳等离子体中快速磁声冲击的非随机提示质子加速
The annual research report Pub Date : 1986-03-01 DOI: 10.1086/164983
J. Sakai, Y. Ohsawa
{"title":"Non-stochastic prompt proton acceleration by fast magnetosonic shocks in the solar plasma","authors":"J. Sakai, Y. Ohsawa","doi":"10.1086/164983","DOIUrl":"https://doi.org/10.1086/164983","url":null,"abstract":"Theoretical and numerical analyses are carried out for plasma heating and proton acceleration (V x B) due to magnetosonic shock waves (MSW) in the solar plasma. A simple model is developed for V x B acceleration by examining a single-particle orbit in a high-amplitude monochromatic electrostatic wave moving in a direction perpendicular to an external magnetic field. The particle can attain the E x B drift velocity. The model is used to derive the maximum velocity a particle can attain when driven by quasi-parallel and quasi-perpendicular MSW. Acceleration is found to be significantly stronger witn the latter, as is demonstrated with results of a 2.5 dimension simulation of acceleration by a quasi-perpendicular MSW. Implications of the results for modeling coronal heating and proton acceleration by MSWs produced by solar flares are discussed. 39 references.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"26 1","pages":"1-32"},"PeriodicalIF":0.0,"publicationDate":"1986-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76725060","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}
引用次数: 39
Theory for Resonant Ion Acceleration by Nonlinear Magnetosonic Fast and Slow Waves in Finite β Plasmas 有限β等离子体中非线性磁子快慢波共振离子加速理论
The annual research report Pub Date : 1985-11-01 DOI: 10.1063/1.865614
Y. Ohsawa
{"title":"Theory for Resonant Ion Acceleration by Nonlinear Magnetosonic Fast and Slow Waves in Finite β Plasmas","authors":"Y. Ohsawa","doi":"10.1063/1.865614","DOIUrl":"https://doi.org/10.1063/1.865614","url":null,"abstract":"A Korteweg–de Vries equation that is applicable to both the nonlinear magnetosonic fast and slow waves is derived from a two‐fluid model with finite ion and electron pressures. As in the cold plasma theory, the fast wave has a critical angle θc. For propagation angles greater than θc (quasiperpendicular propagation), the fast wave has a positive soliton, whereas for angles smaller than θc, it has a negative soliton. Finite  β effects decrease the value of θc. The slow wave has a positive soliton for all angles of propagation. The magnitude of resonant ion acceleration (the vp×B acceleration) by the nonlinear fast and slow waves is evaluated. In the fast wave, the electron pressure makes the acceleration stronger for all propagation angles. The decrease in θc resulting from finite  β effects results in broadening of the region of strong acceleration. It is also found that fairly strong ion acceleration can occur in the nonlinear slow wave in high  β plasmas. The possibility of unlimited acceleration of ion...","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"80 1","pages":"1-39"},"PeriodicalIF":0.0,"publicationDate":"1985-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82588530","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}
引用次数: 65
"Time-Resolved Measurement of Energy and Species of an Intense Pulsed Ion Beam" 强脉冲离子束的能量和种类的时间分辨测量
The annual research report Pub Date : 1985-08-01 DOI: 10.1063/1.1138364
T. Matsuzawa, A. Takahashi, K. Masugata, M. Ito, Masao Matsui, K. Yatsui
{"title":"\"Time-Resolved Measurement of Energy and Species of an Intense Pulsed Ion Beam\"","authors":"T. Matsuzawa, A. Takahashi, K. Masugata, M. Ito, Masao Matsui, K. Yatsui","doi":"10.1063/1.1138364","DOIUrl":"https://doi.org/10.1063/1.1138364","url":null,"abstract":"A time‐resolvable Thomson‐parabola spectrometer is developed employing a microchannel‐plate image intensifier, which acts as a high‐speed shutter (∼5 ns) by gating the applied voltage. Using such a spectrometer, we have achieved the measurement of temporal behavior of beam energy for various ion species of an intense pulsed ion beam extracted from a dual‐current‐feed magnetically insulated diode. The energy of protons is found to be in a good agreement with the diode voltage.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"73 1","pages":"88-101"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89000181","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}
引用次数: 11
Resonant Ion Acceleration by Oblique Magnetosonic Shock Wave in a Collisionless Plasma 斜磁声激波在无碰撞等离子体中的共振离子加速
The annual research report Pub Date : 1985-06-01 DOI: 10.1063/1.865932
Y. Ohsawa
{"title":"Resonant Ion Acceleration by Oblique Magnetosonic Shock Wave in a Collisionless Plasma","authors":"Y. Ohsawa","doi":"10.1063/1.865932","DOIUrl":"https://doi.org/10.1063/1.865932","url":null,"abstract":"A magnetosonic shock wave propagating obliquely to a magnetic field is studied by theory and simulation, with particular attention to the resonant ion acceleration (the vp×B acceleration) by the shock. Theoretical analysis based on a two‐fluid model shows that, in the laminar shock, the electric field strength in the direction normal to the wave is about (mi/me)1/2 times larger for the quasiperpendicular shock than that for the quasiparallel shock, which is a reflection of the fact that the width of the quasiperpendicular shock is much smaller than that of the quasiparallel shock. Time evolution of a totally self‐consistent magnetosonic shock wave is studied by using a 2 1/2 ‐dimensional fully relativistic, fully electromagnetic particle simulation with full ion and electron dynamics. Even the low Mach number shock wave can significantly accelerate some ions by the vp×B acceleration. The resonant ion acceleration occurs more strongly in the quasiperpendicular shock, because the magnitude of this accelerat...","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"124 1","pages":"1-39"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86436593","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}
引用次数: 22
Measuring Method and Confirmation of H^-, D^- Ion Current by Sheet Plasma I 薄片等离子体H^-、D^-离子电流的测量方法及验证[j]
The annual research report Pub Date : 1985-05-01 DOI: 10.3131/JVSJ.28.742
J. Uramoto
{"title":"Measuring Method and Confirmation of H^-, D^- Ion Current by Sheet Plasma I","authors":"J. Uramoto","doi":"10.3131/JVSJ.28.742","DOIUrl":"https://doi.org/10.3131/JVSJ.28.742","url":null,"abstract":"Usually, it is very difficult to separate an electron current from H- or D- ion current under volume production, because both electrons and H- or D- ions are extracted from a discharge plasma in H2 or D2 gas. However, H- or D-ion current by volume production in the sheet plasma can be easily separated from electron current by using the weak magnetic field applied to the sheet plasma itself. Then, if the H- or D- ion current is compared with positive ion (mainly H+3 or D+3) current which is extracted by changing sign of the acceleration voltage from plus (for H- or D- ion) to minus, the H-or D- ion current can be confirmed more exactly.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"28 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"1985-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73709721","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}
引用次数: 0
Collisional Relaxation of Electron Tail Distribution 电子尾分布的碰撞弛豫
The annual research report Pub Date : 1985-04-01 DOI: 10.1143/JPSJ.54.3763
M. Yamagiwa, M. Okamoto
{"title":"Collisional Relaxation of Electron Tail Distribution","authors":"M. Yamagiwa, M. Okamoto","doi":"10.1143/JPSJ.54.3763","DOIUrl":"https://doi.org/10.1143/JPSJ.54.3763","url":null,"abstract":"Relaxation due to the Coulomb collisions of the electron velocity distribution function with a high energy tail is investigated in detail. In the course of the relaxation, a `saddle' point can be created in velocity space owing to v -3 dependence of the deflection rate and a positive slope or a `dip' appears in the tail direction. The time evolution of the electron tail is studied analytically. A comparison is made with numerical results by using a Fokker-Planck code. Also discussed is the kinetic instability concerned with the positive slope during the relaxation.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"24 1","pages":"1-23"},"PeriodicalIF":0.0,"publicationDate":"1985-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75174767","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}
引用次数: 9
Observation of Mode-Converted Ion Bernstein Wave by an HCN Laser Scattering 用HCN激光散射观察模式转换离子伯恩斯坦波
The annual research report Pub Date : 1985-03-01 DOI: 10.1143/JPSJ.54.3757
T. Tetsuka, K. Kawahata, S. Okajima, A. Nishizawa, T. Watari, R. Ando, S. Tanahashi, K. Toi, J. Fujita
{"title":"Observation of Mode-Converted Ion Bernstein Wave by an HCN Laser Scattering","authors":"T. Tetsuka, K. Kawahata, S. Okajima, A. Nishizawa, T. Watari, R. Ando, S. Tanahashi, K. Toi, J. Fujita","doi":"10.1143/JPSJ.54.3757","DOIUrl":"https://doi.org/10.1143/JPSJ.54.3757","url":null,"abstract":"An HCN laser scattering technique is employed for detecting an electrostatic wave excited by ICRF heating on the JIPP T-IIU tokamak. The frequency spectra and wavenumber of the excited wave were observed during the heating. The measured wave is consistent with the theoretically estimated wave dispersion of the ion Bernstein wave which is mode-converted from the fast wave in the vicinity of the ion-ion hybrid resonance layer. The influence of MHD activity on the mode-converted ion Bernstein wave is examined. When the MUD activity grows and the plasma becomes unstable, the scattered signal from the ion Bernstein wave decreases, being accompanied with large fluctuations.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"53 1","pages":"1-20"},"PeriodicalIF":0.0,"publicationDate":"1985-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84196971","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}
引用次数: 5
Lax-Pair Operators for Squared-Sum and Squared-Difference Eigenfunctions 平方和和平方差特征函数的lax对算子
The annual research report Pub Date : 1984-10-01 DOI: 10.1063/1.526866
Y. Ichikawa, Kazu-hiro Iino
{"title":"Lax-Pair Operators for Squared-Sum and Squared-Difference Eigenfunctions","authors":"Y. Ichikawa, Kazu-hiro Iino","doi":"10.1063/1.526866","DOIUrl":"https://doi.org/10.1063/1.526866","url":null,"abstract":"An interrelationship between various representations of the inverse scattering transformation is established by examining eigenfunctions of Lax‐pair operators of the sine–Gordon equation and the modified Korteweg–de Vries equation. In particular, it is shown explicitly that there exist Lax‐pair operators for the squared‐sum and squared‐difference eigenfunctions of the Ablowitz–Kaup–Newell–Segur inverse scattering transformation.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"25 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87655052","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}
引用次数: 1
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