Anomalous diffusion coefficient is evaluated by using result of the renormalized perturbation theory for the turbulent collision. Two cases are investigated for light impurity ions, one in the plateau regime and the other in the banana regime. Time evolution of the wave speetrum is solved numerically and the diffusion coefficient is determined, by taking the density gradient of impurity ions in the same direction as that of the bulk plasma. Even with a small concentration of the impurity the diffusion coefficient takes a smaller value for both regime cases.
{"title":"Effects of Impurity Ions on the Anomalous Diffusion due to the Dissipative Trapped Ion Instability","authors":"A. Hatayama, M. Ogasawara","doi":"10.1143/JPSJ.50.201","DOIUrl":"https://doi.org/10.1143/JPSJ.50.201","url":null,"abstract":"Anomalous diffusion coefficient is evaluated by using result of the renormalized perturbation theory for the turbulent collision. Two cases are investigated for light impurity ions, one in the plateau regime and the other in the banana regime. Time evolution of the wave speetrum is solved numerically and the diffusion coefficient is determined, by taking the density gradient of impurity ions in the same direction as that of the bulk plasma. Even with a small concentration of the impurity the diffusion coefficient takes a smaller value for both regime cases.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"60 1","pages":"1-34"},"PeriodicalIF":0.0,"publicationDate":"1980-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78168130","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 collisionless drift wave instability driven by an electron temperature inhomogeneity (electron temperature gradient instability) and the enhanced transport processes associated with it are studied using a two-and-a-half dimensional particle simulation code. The simulation results show that quasilinear diffusion in phase space is an important mechanism for the saturation of this instability. The instability yields particle fluxes toward the hot plasma regions. The magnetic shear stabilizes the instability. However the heat conductivity of the electron temperature perpendicular to the magnetic field, T e⊥ , is not reduced by the magnetic shear but remains high, whereas the heat conductivity of the parallel temperature, T e// , is effectively reduced.
{"title":"Anomalous Plasma Transport due to Electron Temperature Gradient Instability","authors":"S. Tokuda, T. Kamimura, Hiroshi Ito","doi":"10.1143/JPSJ.48.1722","DOIUrl":"https://doi.org/10.1143/JPSJ.48.1722","url":null,"abstract":"The collisionless drift wave instability driven by an electron temperature inhomogeneity (electron temperature gradient instability) and the enhanced transport processes associated with it are studied using a two-and-a-half dimensional particle simulation code. The simulation results show that quasilinear diffusion in phase space is an important mechanism for the saturation of this instability. The instability yields particle fluxes toward the hot plasma regions. The magnetic shear stabilizes the instability. However the heat conductivity of the electron temperature perpendicular to the magnetic field, T e⊥ , is not reduced by the magnetic shear but remains high, whereas the heat conductivity of the parallel temperature, T e// , is effectively reduced.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"1 1","pages":"1-50"},"PeriodicalIF":0.0,"publicationDate":"1980-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87508098","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 : 1979-09-01DOI: 10.1088/0022-3700/12/24/004
H. Hanashiro, Y. Suzuki, A. Mikuni, T. Sasaki, T. Takayanagi, K. Wakiya, Harukazu Suzuki, A. Danjo, S. Ohtani, T. Hino
The L23M23M23 Auger electron spectra of argon produced by photoionisation have been studied. The range of photon energy is from 249 eV, just above the L3 edge, to 270 eV. The closer the photon energy is to the threshold, the more conspicuously observed is the effect of the post-collision interaction as a shift of the peak and an asymmetric profile in each Auger line. The observed dependence of the energy shift upon the kinetic energy of the photoelectron has been compared with the semiclassical theory, after Niehaus (1977), and the mean lifetime for the Auger decay of an inner-shell hole is deduced to be 2.4*10-14s.
{"title":"Post Collision Interaction in photoexcited Argon LMM Auger processes","authors":"H. Hanashiro, Y. Suzuki, A. Mikuni, T. Sasaki, T. Takayanagi, K. Wakiya, Harukazu Suzuki, A. Danjo, S. Ohtani, T. Hino","doi":"10.1088/0022-3700/12/24/004","DOIUrl":"https://doi.org/10.1088/0022-3700/12/24/004","url":null,"abstract":"The L23M23M23 Auger electron spectra of argon produced by photoionisation have been studied. The range of photon energy is from 249 eV, just above the L3 edge, to 270 eV. The closer the photon energy is to the threshold, the more conspicuously observed is the effect of the post-collision interaction as a shift of the peak and an asymmetric profile in each Auger line. The observed dependence of the energy shift upon the kinetic energy of the photoelectron has been compared with the semiclassical theory, after Niehaus (1977), and the mean lifetime for the Auger decay of an inner-shell hole is deduced to be 2.4*10-14s.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"841 1","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"1979-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83514091","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. Yagishita, K. Wakiya, T. Takayanagi, Harukazu Suzuki, F. Koike, S. Ohtani
Spectra of electrons ejected from doubly excited states of helium have been extensively measured at several observation angles for impact of lithium ions at energies lower than 5 keV. ''Molecular-autoionization'' spectra have been found at forward observation angles, and analyzed in terms of the Gerber-Niehaus theory with modification. The spectral shapes of atomic-autoionization peaks have been discussed in relation to both the Barker-Berry effect and the Doppler effect. Excitation cross sections of autoionizing states have been determined by a new method that uses simultaneous impact of ions and electrons.
{"title":"Electron spectra resulting from autoionization in low-energy Li(+) + He collisions","authors":"A. Yagishita, K. Wakiya, T. Takayanagi, Harukazu Suzuki, F. Koike, S. Ohtani","doi":"10.1103/PHYSREVA.22.118","DOIUrl":"https://doi.org/10.1103/PHYSREVA.22.118","url":null,"abstract":"Spectra of electrons ejected from doubly excited states of helium have been extensively measured at several observation angles for impact of lithium ions at energies lower than 5 keV. ''Molecular-autoionization'' spectra have been found at forward observation angles, and analyzed in terms of the Gerber-Niehaus theory with modification. The spectral shapes of atomic-autoionization peaks have been discussed in relation to both the Barker-Berry effect and the Doppler effect. Excitation cross sections of autoionizing states have been determined by a new method that uses simultaneous impact of ions and electrons.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"45 1","pages":"1-37"},"PeriodicalIF":0.0,"publicationDate":"1979-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78106533","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}
Cross-field electron heat diffusion due to thermally excited high frequency electrostatic waves propagating almost perpendicular to the magnetic field is studied using a 2–1 /2-dimensional simulation code. It is shown that the electron heat diffusion coefficient D H is an order of magnitude greater than the electron particle diffusion coefficient D p , which is essentially collisional. The characteristic feature of wave transport is observed, namely an increase of D H with increasing values of the characteristic temperature scale length L x . The heat diffusion coefficients D // H and D ⊥ H for the parallel and perpendicular temperatures ( D H ≃ D // H + D ⊥ H ) show quite different magnetic field scalings since D // H is due to ion modes while D ⊥ H arises from electron modes. This is also confirmed by treating the ions as an immobile background.
{"title":"Cross-field Electron Heat Transport due to High Frequency Electrostatic Waves","authors":"H. Naitou","doi":"10.1143/JPSJ.48.608","DOIUrl":"https://doi.org/10.1143/JPSJ.48.608","url":null,"abstract":"Cross-field electron heat diffusion due to thermally excited high frequency electrostatic waves propagating almost perpendicular to the magnetic field is studied using a 2–1 /2-dimensional simulation code. It is shown that the electron heat diffusion coefficient D H is an order of magnitude greater than the electron particle diffusion coefficient D p , which is essentially collisional. The characteristic feature of wave transport is observed, namely an increase of D H with increasing values of the characteristic temperature scale length L x . The heat diffusion coefficients D // H and D ⊥ H for the parallel and perpendicular temperatures ( D H ≃ D // H + D ⊥ H ) show quite different magnetic field scalings since D // H is due to ion modes while D ⊥ H arises from electron modes. This is also confirmed by treating the ions as an immobile background.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"62 1","pages":"1-29"},"PeriodicalIF":0.0,"publicationDate":"1979-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73181413","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}
{"title":"Soliton Solutions in a Diatomic Lattice System","authors":"N. Yajima, J. Satsuma","doi":"10.1143/PTP.62.370","DOIUrl":"https://doi.org/10.1143/PTP.62.370","url":null,"abstract":"","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"42 1","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"1979-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78384354","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 reflex tetrode is proposed to be made on the basis of a new idea that the plasma source is separated from the anode. It is shown that the ion beam is forced to move from the anode toward the virtual cathode in the reflex tetrode. The expressions are derived for the ion-beam current densities which are extracted from reflex tetrodes. Two types of tetrodes, one of which has the ion source and the other has the plasma source, are considered. The analyses are given for the three kinds of geometries; plane, cylindrical and spherical.
{"title":"Analysis of ion beam extracted from reflex tetrode","authors":"S. Kawata, T. Abe, K. Kasuya, K. Niu","doi":"10.1143/JPSJ.48.591","DOIUrl":"https://doi.org/10.1143/JPSJ.48.591","url":null,"abstract":"A reflex tetrode is proposed to be made on the basis of a new idea that the plasma source is separated from the anode. It is shown that the ion beam is forced to move from the anode toward the virtual cathode in the reflex tetrode. The expressions are derived for the ion-beam current densities which are extracted from reflex tetrodes. Two types of tetrodes, one of which has the ion source and the other has the plasma source, are considered. The analyses are given for the three kinds of geometries; plane, cylindrical and spherical.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"119 1","pages":"1-18"},"PeriodicalIF":0.0,"publicationDate":"1979-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77065895","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}
{"title":"Numerical Analysis of Current-Driven Collisional Drift and Alfven Instabilities in a Sheared Magnetic Field","authors":"Ken-ichi Nishi-kawa","doi":"10.1143/jpsj.46.1043","DOIUrl":"https://doi.org/10.1143/jpsj.46.1043","url":null,"abstract":"","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"86 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"1978-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75336999","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}
Cross field heat and particle transport due to the thermally excited convective cell mode is investigated both by theoretical work and by particle simulations. A parameter range exists where the heat diffusion coefficient is considerably less than the particle diffusion coefficient. This comes from the fact that high energy particles in a velocity distribution diffuse much more slowly than the low energy particles, because the fluctuating electric fields are averaged out over their finite Larmor radii. A velocity dependent diffusion coefficient is obtained by a simple theory, together with an estimate of the heat diffusion coefficient. Good agreement with the simulation results is obtained. The magnetic field scaling of heat diffusion/particle diffusion coefficients is also discussed. The results imply that ions in a thermonuclear reactor should be less affected by turbulence than are electrons, as appears to be the case.
{"title":"Kinetic Effects on the Convective Plasma Diffusion and the Heat Transport","authors":"H. Naitou, T. Kamimura, J. Dawson","doi":"10.1143/JPSJ.46.258","DOIUrl":"https://doi.org/10.1143/JPSJ.46.258","url":null,"abstract":"Cross field heat and particle transport due to the thermally excited convective cell mode is investigated both by theoretical work and by particle simulations. A parameter range exists where the heat diffusion coefficient is considerably less than the particle diffusion coefficient. This comes from the fact that high energy particles in a velocity distribution diffuse much more slowly than the low energy particles, because the fluctuating electric fields are averaged out over their finite Larmor radii. A velocity dependent diffusion coefficient is obtained by a simple theory, together with an estimate of the heat diffusion coefficient. Good agreement with the simulation results is obtained. The magnetic field scaling of heat diffusion/particle diffusion coefficients is also discussed. The results imply that ions in a thermonuclear reactor should be less affected by turbulence than are electrons, as appears to be the case.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"1 1","pages":"1-34"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89012947","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 confinement of fusion-generated alpha particles will affect the transports of the background plasma particles by the momentum transfer from the energetic alphas. The ions tend to migrate towards the center of plasma (i.e. fuel injection) and electrons towards the plasma periphery. This means the existence of a mechanism which is able to pump out the ashes in the fuel plasma because of the momentum conservation of whole plasma particles.
{"title":"Plasma Flow Driven by Fusion-Generated Alpha Particles","authors":"K. Ikuta","doi":"10.1143/JPSJ.45.1725","DOIUrl":"https://doi.org/10.1143/JPSJ.45.1725","url":null,"abstract":"The confinement of fusion-generated alpha particles will affect the transports of the background plasma particles by the momentum transfer from the energetic alphas. The ions tend to migrate towards the center of plasma (i.e. fuel injection) and electrons towards the plasma periphery. This means the existence of a mechanism which is able to pump out the ashes in the fuel plasma because of the momentum conservation of whole plasma particles.","PeriodicalId":22276,"journal":{"name":"The annual research report","volume":"71 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"1978-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88099149","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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