On the inverse problem for Channell collisionless plasma equilibria
On the inverse problem for Channell collisionless plasma equilibria
复制标题
Channell无碰撞等离子体平衡的反问题
DOI:
10.1093/imamat/hxy026
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发表时间:
2018
影响因子:
1.2
通讯作者:
Allanson O
中科院分区:
文献类型:
--
作者:
Allanson O
Vlasov–Maxwell equilibria are described by the self-consistent solutions of the time-independent Maxwell equations for the real-space dynamics of electromagnetic fields and the Vlasov equation for the phase-space dynamics of particle distribution functions (DFs) in a collisionless plasma. These two systems (macroscopic and microscopic) are coupled via the source terms in Maxwell’s equations, which are sums of velocity-space ‘moment’ integrals of the particle DF. This paper considers a particular subset of solutions of the broad plasma physics problem: ‘the inverse problem for collisionless equilibria’ (IPCE), viz.‘given information regarding the macroscopic configuration of a collisionless plasma equilibrium, what self-consistent equilibrium DFs exist?’We introduce the constants of motion approach to IPCE using the assumptions of a ‘modified Maxwellian’ DF, and a strictly neutral and spatially one-dimensional plasma, and this is consistent with ‘Channell’s method’ (, Exact Vlasov-Maxwell equilibria with sheared magnetic fields.Phys. Fluids,19, 1541–1545). In such circumstances, IPCE formally reduces to the inversion of Weierstrass transformations (, The Weierstrass transform and Hermite polynomials.Duke Math. J.,29, 293–308). These are the same transformations that feature in the initial value problem for the heat/diffusion equation. We discuss the various mathematical conditions that a candidate solution of IPCE must satisfy. One method that can be used to invert the Weierstrass transform is expansions in Hermite polynomials. Building on the results of , From one-dimensional fields to Vlasov equilibria: Theory and application of Hermite polynomials.Journal of Plasma Physics,82, 905820306, http://doi:10.1017/S0022377816000519), we establish under what circumstances a solution obtained by these means converges and allows velocity moments of all orders. Ever since the seminal work by , Exact nonlinear plasma oscillations.Phys. Rev.,108, 546–550) on ‘stationary’ electrostatic plasma waves, the necessary quality of non-negativity has been noted as a feature that any candidate solution of IPCE will nota priorisatisfy. We discuss this problem in the context of Channell equilibria, for magnetized plasmas.
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DOI:
10.1142/2965
发表时间:
1996
期刊:
--
影响因子:
--
作者:
G. Marsh
通讯作者:
G. Marsh
DOI:
--
发表时间:
1961
期刊:
影响因子:
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作者:
H. Grad
通讯作者:
H. Grad
DOI:
--
发表时间:
1967
期刊:
影响因子:
--
作者:
C. M. Davies
通讯作者:
C. M. Davies
影响因子:
2.9
作者:
Abhijit Ghosh;M. Janaki;B. Dasgupta;A. Bandyopadhyay
通讯作者:
A. Bandyopadhyay
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
D. Burgess;M. Scholer
通讯作者:
M. Scholer