Polarisation of the Balmer-α emission in crossed electric and magnetic fields

Thorman, A.

doi:10.1016/j.jqsrt.2017.12.015

Cited by 4 publications

(5 citation statements)

References 17 publications

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“…The corresponding coefficient of transformation is estimated to be less than 10 −8 ; however, the axionically induced electric field near magnetars is able to produce the quite distinguishable Stark effect. When one has both effects in the magnetic and electric fields (parallel and/or crossed), then the possibility appears to combine the well-elaborated methods and to organize an extended diagnostics [43]. Clearly, the standard Coulombian type radial electric field can be produced in many standard charged astrophysical objects, but if we hope to identify, say, the axionic dyon, we have to find some very specific detail distinguishing this object.…”

Section: Discussionmentioning

confidence: 99%

Fingerprints of the Cosmological Constant: Folds in the Profiles of the Axionic Dark Matter Distribution in a Dyon Exterior

Balakin

Groshev

2020

Symmetry

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We consider the magnetic monopole in the axionic dark matter environment (axionic dyon) in the framework of the Reissner-Nordström-de Sitter model. Our aim is to study the distribution of the pseudoscalar (axion) and electric fields near the so-called folds, which are characterized by the profiles with the central minimum, the barrier on the left, and the maximum on the right of this minimum. The electric field in the fold-like zones is shown to change the sign twice, i.e., the electric structure of the near zone of the axionic dyon contains the domain similar to a double electric layer. We have shown that the described fold-like structures in the profile of the gravitational potential, and in the profiles of the electric and axion fields can exist, when the value of the dyon mass belongs to the interval enclosed between two critical masses, which depend on the cosmological constant.

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Section: Discussionmentioning

confidence: 99%

Fingerprints of the Cosmological Constant: Folds in the Profiles of the Axionic Dark Matter Distribution in a Dyon Exterior

Balakin

Groshev

2020

Symmetry

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“…It is the presence of the coherence terms in Eqs. (4)(5)(6)(7)(8)(9) that explains the asymmetry between the red-and blue-shifted lines for Stark effect measurement (note that the influence of field ionisation is still low [32] under these conditions). Therefore, for instance, depending on the orientation between the cathode rays and the vector direction of the electric field (e.g., parallel, α = 0; transverse, α = π/2; or anti-parallel, α = π) blue-shifted, red-shifted, or symmetric patterns were detected for Balmer-α components of the emission [17].…”

Section: Theoretical Approachmentioning

confidence: 99%

“…Here we report the line intensities of the Lyman-α, β and Balmer-α lines for different values of α (Figs. [4][5][6]. The angle between the line-of-sight and the direction of the electric field is θ = π/2.…”

Section: Lines Ratio Of Stark Components In the Low Density Limitmentioning

confidence: 99%

“…≈ 25 keV) play a dominant role [1]. Local measurements of ion temperature, concentration of impurity ions, plasma rotation, and electric field measurements including polarisation coherence, or control of the plasma current density profile, are the most representative examples of the use of injection of heating or diagnostic beams in fusion plasmas [2][3][4][5][6]. So, for instance, charge-exchange recombination spectroscopy, which is based on the capture of bound electrons of the beam atoms by impurity ions, has been exploited for the last few decades on practically all former and present tokamaks and stellarators, including JET, ASDEX, W7-X, KSTAR, etc., [7].…”

Section: Introductionmentioning

confidence: 99%

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Atomic Data for Calculation of the Intensities of Stark Components of Excited Hydrogen Atoms in Fusion Plasmas

Marchuk

Schultz

Ralchenko

2020

Atoms

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Motional Stark effect (MSE) spectroscopy represents a unique diagnostic tool capable of determining the magnitude of the magnetic field and its direction in the core of fusion plasmas. The primary excitation channel for fast hydrogen atoms in injected neutral beams, with energy in the range of 25-1000 keV, is due to collisions with protons and impurity ions (e.g., He 2+ and heavier impurities). As a result of such excitation, at the particle density of 10 13 -10 14 cm −3 , the line intensities of the Stark multiplets do not follow statistical expectations (i.e., the populations of fine-structure levels within the same principal quantum number n are not proportional to their statistical weights). Hence, any realistic modeling of MSE spectra has to include the relevant collisional atomic data. In this paper we provide a general expression for the excitation cross sections in parabolic states within n=3 for an arbitrary orientation between the direction of the motion-induced electric field and the proton-atom collisional axis. The calculations make use of the density matrix obtained with the atomic orbital close coupling method and the method can be applied to other collisional systems (e.g., He 2+ , Be 4+ , C 6+ , etc.). The resulting cross sections are given as simple fits that can be directly applied to spectral modeling. For illustration we note that the asymmetry detected in the first classical cathode ray experiments between the red-and blue-shifted spectral components can be quantitatively studied using the proposed approach.

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“…Moreover, one can find the specific zones in the vicinity of the magnetic star, in which the electric and magnetic fields are parallel, and are crossed. The corresponding methodic to observe fine effects in the parallel and crossed electric and magnetic fields are well-elaborated in the terrestrial laboratories (see, e.g., [29]); clearly, it can be applied to the magnetic star spectroscopy also. In other word, the analysis of the magnetic star spectrum plus detailed prognosis concerning the distribution of the axionically induced electric field, are expected to provide the diagnostics of the axion field structure near the magnetic star.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectrostatics of axionically active systems: Induced field restructuring in magnetic stars

Balakin

Groshev

2020

Phys. Rev. D

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In the framework of Einstein-Maxwell-axion theory we consider a static field configuration in the outer zone of a magnetic star. We assume that this field configuration is formed by the following interacting quartet: a spherically symmetric gravitational field of the Reissner-Nordström type, pseudoscalar field, associated with an axionic dark matter, strong intrinsic magnetic field, and axionically induced electric field. Based on the analysis of the solutions to the master equations of the model, we show that the structure of the formed field configuration reveals the following triple effect. First, if the strong magnetic field of the star has the dipole component, the axionic halo around the magnetic star with spherically symmetric gravitational field is no longer spheroidal, and the distortion is induced by the axion-photon coupling; second, due to the distortion of the axionic halo the magnetic field is no longer pure dipolar, and the induced quadruple, octupole, etc., components appear thus redistributing the magnetic energy between the components with more steep radial profiles than the dipolar one; third, the interaction of the axionic and magnetic fields produces the electric field, which inherits their multipole structure. We attract attention to possible applications of the predicted field restructuring to the theory of axionic rotating magnetars.

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Polarisation of the Balmer-α emission in crossed electric and magnetic fields

Cited by 4 publications

References 17 publications

Fingerprints of the Cosmological Constant: Folds in the Profiles of the Axionic Dark Matter Distribution in a Dyon Exterior

Fingerprints of the Cosmological Constant: Folds in the Profiles of the Axionic Dark Matter Distribution in a Dyon Exterior

Atomic Data for Calculation of the Intensities of Stark Components of Excited Hydrogen Atoms in Fusion Plasmas

Magnetoelectrostatics of axionically active systems: Induced field restructuring in magnetic stars

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