Plasma-Related Atomic Physics with an Electron Beam Ion Trap

Nakamura, Nobuyuki

doi:10.1585/pfr.8.1101152

Cited by 2 publications

(2 citation statements)

References 36 publications

(45 reference statements)

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“…The classical Livermore EBIT with the electron beam energy E e of up to 30 keV is now widely replicated around the globe. The devices similar to the high-energy SuperEBIT aiming at the production of highly charged heavy ions were also constructed in Germany, Japan and China [7][8][9]. All the devices mentioned above employ the cryogenic engineering and superconducting magnetic focusing systems.…”

Section: Electron Beam Ion Sources and Trapsmentioning

confidence: 99%

“…In particular, one can mention here the spectroscopic data relevant to the sources of the extreme ultraviolet radiation (ions of Sn and Xe with the charge q ∼ +10) and diagnostics of high-temperature plasmas related to the solar corona (ions of Fe with q ∼ +10) and to fusion plasmas in the ITER reactor (ions of tungsten with q ∼ +20). In 2012, a compact EBIT with the energy of electron beam from 100 eV up to 2.5 keV was developed for these purposes at the University of Electro-Communications in Tokyo [8]. Similar devices were also built at the Fudan University and the National Institute of Standards and Technology [15,16].…”

Section: Classification Of Ion Sources With Respect To Electron Beam ...mentioning

confidence: 99%

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Universal main magnetic focus ion source: A new tool for laboratory research of astrophysics and Tokamak microplasma

Ovsyannikov¹,

Nefiodov

Levin³

2017

J. Phys.: Conf. Ser.

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A novel room-temperature ion source for the production of atomic ions in electron beam within wide ranges of electron energy and current density is developed. The device can operate both as conventional Electron Beam Ion Source/Trap (EBIS/T) and novel Main Magnetic Focus Ion Source. The ion source is suitable for generation of the low-, medium-and high-density microplasma in steady state, which can be employed for investigation of a wide range of physical problems in ordinary university laboratory, in particular, for microplasma simulations relevant to astrophysics and ITER reactor. For the electron beam characterized by the incident energy E e = 10 keV, the current density j e ∼ 20 kA/cm 2 and the number density n e ∼ 2 × 10 13 cm −3 were achieved experimentally. For E e ∼ 60 keV, the value of electron number density n e ∼ 10 14 cm −3 is feasible. The efficiency of the novel ion source for laboratory astrophysics significantly exceeds that of other existing warm and superconducting EBITs. A problem of the K-shell electron ionization of heavy and superheavy elements is also discussed. * URL: http://mamfis.net/ovsyannikov.html †

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Section: Electron Beam Ion Sources and Trapsmentioning

confidence: 99%

Section: Classification Of Ion Sources With Respect To Electron Beam ...mentioning

confidence: 99%

Universal main magnetic focus ion source: A new tool for laboratory research of astrophysics and Tokamak microplasma

Ovsyannikov¹,

Nefiodov

Levin³

2017

J. Phys.: Conf. Ser.

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Characteristics of ground state electronic structures of ionized atoms and rules of their orbital competitions

Jin¹,

Gao²,

Zeng³

et al. 2016

Acta Phys. Sin.

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Ionized atoms widely exist in plasmas, and studies of properties of ionized atoms are the foundations of frontier science researches such as astrophysics and controlled nuclear fusions. For example, the information about the ground configurations of atoms is required for accurately calculating the physical quantities such as energy levels and dynamical processes. The configurations for different ionized atoms can be obtained with the photo-electron energy spectrum experiment, however it is very time-consuming to obtain so many data of all ions. Therefore the more economical theoretical study will be of great importance. As is well known, the configurations of neutral atoms can be determined according to Mendeleev order while those of highly ionized atoms are hydrogen-like due to the strong Coulombic potential of their nuclei. Then with the variations of ionization degree and atomic number along the periodic table, there would appear the interesting competitions between electronic orbitals. Although some theoretical results exist for ions 3 Z 118, 3 Ne 105 (where Z is the atomic number and Ne is the electron number), there are many errors in the results for highly ionized atoms. Therefore, the ground configurations of ionized atoms and their orbital competitions still deserve to be systematically studied. Based on the independent electron approximation, we calculate the energy levels of all possible competition configurations of all the neutral and ionized atoms in the extended periodic tables (2 Z 119) by Dirac-Slater method. Then the ground configurations are determined by calculating the chosen lowest total energy. The advantages of Dirac- Slater method are as follows. 1) It has been shown that the Dirac-Slater calculation is accurate enough for studying the ground properties of atoms, such as the 1st threshold, and that higher accuracy will be obtained for highly ionized atoms, because the electron correlation becomes less important. 2) Furthermore, with Dirac-Slater method we can obtain the localized self-consistent potential, thereby we can study the orbital competition rules for different atoms. Using the three of our designed atomic orbital competition graphs, all of our calculated ground configurations for over 7000 ionized atoms are conveniently expressed. We systematically summarize the rules of orbital competitions for different elements in different periods. We elucidate the mechanism of orbital competition (i.e., orbital collapsing) with the help of self-consistent atomic potential of ionized atoms. Also we compare the orbital competition rules for different periods of transition elements, the rare-earth and transuranium elements with the variation of the self-consistent filed for different periods. On this basis, we summarize the relationship between the orbital competitions and some bulk properties for some elements, such as the superconductivity, the optical properties, the mechanical strength, and the chemistry activities. We find that there exist some abnormal orbital competitions for some lowly ionized and neutral atoms which may lead to the unique bulk properties for the element. With the ground state electronic structures of ionized atoms, we can construct the basis of accurate quasi-complete configuration interaction (CI) calculations, and further accurately calculate the physical quantities like the energy levels, transition rates, collision cross section, etc. Therefore we can meet the requirements of scientific researches such as the analysis of high-power free-electron laser experiments and the accurate measurement of the mass of nuclei.

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Plasma-Related Atomic Physics with an Electron Beam Ion Trap

Cited by 2 publications

References 36 publications

Universal main magnetic focus ion source: A new tool for laboratory research of astrophysics and Tokamak microplasma

Universal main magnetic focus ion source: A new tool for laboratory research of astrophysics and Tokamak microplasma

Characteristics of ground state electronic structures of ionized atoms and rules of their orbital competitions

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