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Hartmann P, Reyes JC, Kostadinova EG, Matthews LS, Hyde TW, Masheyeva RU, Dzhumagulova KN, Ramazanov TS, Ott T, Kählert H, Bonitz M, Korolov I, Donkó Z. Self-diffusion in two-dimensional quasimagnetized rotating dusty plasmas. Phys Rev E 2019; 99:013203. [PMID: 30780312 DOI: 10.1103/physreve.99.013203] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Indexed: 11/07/2022]
Abstract
The self-diffusion phenomenon in a two-dimensional dusty plasma at extremely strong (effective) magnetic fields is studied experimentally and by means of molecular dynamics simulations. In the experiment the high magnetic field is introduced by rotating the particle cloud and observing the particle trajectories in a corotating frame, which allows reaching effective magnetic fields up to 3000 T. The experimental results confirm the predictions of the simulations: (i) superdiffusive behavior is found at intermediate timescales and (ii) the dependence of the self-diffusion coefficient on the magnetic field is well reproduced.
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Affiliation(s)
- P Hartmann
- Institute for Solid State Physics and Optics, Wigner Research Centre, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary.,Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - J C Reyes
- Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - E G Kostadinova
- Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - L S Matthews
- Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - T W Hyde
- Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - R U Masheyeva
- IETP, Al Farabi Kazakh National University, 71 al Farabi Avenue, Almaty 050040, Kazakhstan
| | - K N Dzhumagulova
- IETP, Al Farabi Kazakh National University, 71 al Farabi Avenue, Almaty 050040, Kazakhstan
| | - T S Ramazanov
- IETP, Al Farabi Kazakh National University, 71 al Farabi Avenue, Almaty 050040, Kazakhstan
| | - T Ott
- Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
| | - H Kählert
- Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
| | - M Bonitz
- Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
| | - I Korolov
- Institute for Solid State Physics and Optics, Wigner Research Centre, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
| | - Z Donkó
- Institute for Solid State Physics and Optics, Wigner Research Centre, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
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Baalrud SD, Daligault J. Transport regimes spanning magnetization-coupling phase space. Phys Rev E 2017; 96:043202. [PMID: 29347622 DOI: 10.1103/physreve.96.043202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Indexed: 06/07/2023]
Abstract
The manner in which transport properties vary over the entire parameter-space of coupling and magnetization strength is explored. Four regimes are identified based on the relative size of the gyroradius compared to other fundamental length scales: the collision mean free path, Debye length, distance of closest approach, and interparticle spacing. Molecular dynamics simulations of self-diffusion and temperature anisotropy relaxation spanning the parameter space are found to agree well with the predicted boundaries. Comparison with existing theories reveals regimes where they succeed, where they fail, and where no theory has yet been developed.
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Affiliation(s)
- Scott D Baalrud
- Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA
| | - Jérôme Daligault
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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Lee MJ, Jung YD. Influence of collective nonideal shielding on fusion reaction in partially ionized classical nonideal plasmas. Phys Rev E 2017; 95:043211. [PMID: 28505747 DOI: 10.1103/physreve.95.043211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Indexed: 11/07/2022]
Abstract
The collective nonideal effects on the nuclear fusion reaction process are investigated in partially ionized classical nonideal hydrogen plasmas. The effective pseudopotential model taking into account the collective and plasma shielding effects is applied to describe the interaction potential in nonideal plasmas. The analytic expressions of the Sommerfeld parameter, the fusion penetration factor, and the cross section for the nuclear fusion reaction in nonideal plasmas are obtained as functions of the nonideality parameter, Debye length, and relative kinetic energy. It is found that the Sommerfeld parameter is suppressed due to the influence of collective nonideal shielding. However, the collective nonideal shielding is found to enhance the fusion penetration factor in partially ionized classical nonideal plasmas. It is also found that the fusion penetration factors in nonideal plasmas represented by the pseudopotential model are always greater than those in ideal plasmas represented by the Debye-Hückel model. In addition, it is shown that the collective nonideal shielding effect on the fusion penetration factor decreases with an increase of the kinetic energy.
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Affiliation(s)
- Myoung-Jae Lee
- Department of Physics, Hanyang University, Seoul 04763, South Korea and Research Institute for Natural Sciences, Hanyang University, Seoul 04763, South Korea
| | - Young-Dae Jung
- Department of Applied Physics and Department of Bionanotechnology, Hanyang University, Ansan, Kyunggi-Do 15588, South Korea and Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180-3590, USA
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Fu ZG, Wang Z, Li ML, Li DF, Kang W, Zhang P. Dynamic properties of the energy loss of multi-MeV charged particles traveling in two-component warm dense plasmas. Phys Rev E 2016; 94:063203. [PMID: 28085472 DOI: 10.1103/physreve.94.063203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2016] [Indexed: 06/06/2023]
Abstract
The energy loss of multi-MeV charged particles moving in two-component warm dense plasmas (WDPs) is studied theoretically beyond the random-phase approximation. The short-range correlations between particles are taken into account via dynamic local field corrections (DLFC) in a Mermin dielectric function for two-component plasmas. The mean ionization states are obtained by employing the detailed configuration accounting model. The Yukawa-type effective potential is used to derive the DLFC. Numerically, the DLFC are obtained via self-consistent iterative operations. We find that the DLFC are significant around the maximum of the stopping power. Furthermore, by using the two-component extended Mermin dielectric function model including the DLFC, the energy loss of a proton with an initial energy of ∼15 MeV passing through a WDP of beryllium with an electronic density around the solid value n_{e}≈3×10^{23}cm^{-3} and with temperature around ∼40 eV is estimated numerically. The numerical result is reasonably consistent with the experimental observations [A. B. Zylsta et al., Phys. Rev. Lett. 111, 215002 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.215002]. Our results show that the partial ionization and the dynamic properties should be of importance for the stopping of charged particles moving in the WDP.
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Affiliation(s)
- Zhen-Guo Fu
- Center for Fusion Energy Science and Technology, CAEP, P.O. Box 8009, Beijing 100088, China
- Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China
| | - Zhigang Wang
- Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China
| | - Meng-Lei Li
- Center for Fusion Energy Science and Technology, CAEP, P.O. Box 8009, Beijing 100088, China
- Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China
| | - Da-Fang Li
- Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China
| | - Wei Kang
- HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China
| | - Ping Zhang
- Center for Fusion Energy Science and Technology, CAEP, P.O. Box 8009, Beijing 100088, China
- Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China
- HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China
- Center for Compression Science, CAEP, Mianyang 621900, China
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