Magnetic field enhanced cold plasma sterilization

In a cold plasma the wave equation for solely compressional magnetic field perturbations appears to decouple in any surface orthogonal to the background magnetic field. However, the compressional fields in any two of these surfaces are related to each other by the condition that the perturbation field b be divergence-free. Hence the wave equations in these surfaces are not truly decoupled from one another. If the two solutions happen to be ‘matched’ (i.e. V.b = 0) then the medium may execute a solely compressional oscillation. If the two solutions are unmatched then transverse fields must evolve. We consider two classes of compressional solutions and derive a set of criteria for when the medium will be able to support pure compressional field oscillations. These criteria relate to the geometry of the magnetic field and the plasma density distribution. We present the conditions in such a manner that it is easy to see if a given magnetoplasma is able to executive either of the compressional solutions we investigate.

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Cerenkov and cyclotron instabilities in a plasma stream

Journal of Plasma Physics ◽

10.1017/s0022377800003068 ◽

1967 ◽

Vol 1 (1) ◽

pp. 1-27 ◽

Cited By ~ 7

Author(s):

C. F. Knox

Keyword(s):

Magnetic Field ◽

Plane Wave ◽

Cold Plasma ◽

Numerical Calculations ◽

Graphical Form ◽

Plasma Stream ◽

Wave Growth ◽

Stationary Medium ◽

Phase Propagation ◽

Positive Ion

The model of a stationary medium traversed by a weak plasma stream directed along a magnetic field is investigated. The usual linear treatment is adopted, and the stream is taken to be ‘cold’, with only electron (perturbation) motions considered. The objective is to assess the plane-wave growth associated with both Cerenkov and cyclotron instabilities; in particular, the dependence of the growth on frequency and angle of phase propagation. The main discussion is of the case when the stationary medium is a cold plasma in which both electron and positive ion motions are taken into account. Various expressions for the growth are derived, and numerical calculations are presented in graphical form.

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Modeling the inactivation of Bacillus subtilis spores during cold plasma sterilization

Innovative Food Science & Emerging Technologies ◽

10.1016/j.ifset.2018.12.011 ◽

2019 ◽

Vol 52 ◽

pp. 334-342 ◽

Cited By ~ 10

Author(s):

Gabriella Mendes-Oliveira ◽

Jeanette L. Jensen ◽

Kevin M. Keener ◽

Osvaldo H. Campanella

Keyword(s):

Bacillus Subtilis ◽

Cold Plasma ◽

Plasma Sterilization

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A Magnetic Field-Independent Absorbing Boundary Condition for Magnetized Cold Plasma

IEEE Antennas and Wireless Propagation Letters ◽

10.1109/lawp.2011.2139191 ◽

2011 ◽

Vol 10 ◽

pp. 294-297 ◽

Cited By ~ 14

Author(s):

Yaxin Yu ◽

J J Simpson

Keyword(s):

Magnetic Field ◽

Boundary Condition ◽

Cold Plasma ◽

Absorbing Boundary Condition ◽

Absorbing Boundary ◽

Field Independent ◽

Magnetized Cold Plasma

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Self-Trapping and Instability of Hydromagnetic Waves Along the Magnetic Field in a Cold Plasma

Physical Review Letters ◽

10.1103/physrevlett.21.209 ◽

1968 ◽

Vol 21 (4) ◽

pp. 209-212 ◽

Cited By ~ 262

Author(s):

T. Taniuti ◽

H. Washimi

Keyword(s):

Magnetic Field ◽

Cold Plasma ◽

Self Trapping ◽

Hydromagnetic Waves ◽

The Magnetic Field

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Nonlinear non-stationary Alfvén resonance

Journal of Plasma Physics ◽

10.1017/s0022377899007758 ◽

1999 ◽

Vol 62 (2) ◽

pp. 145-164 ◽

Cited By ~ 3

Author(s):

I. S. DMITRIENKO

Keyword(s):

Magnetic Field ◽

Nonlinear Equation ◽

Spatial Structure ◽

Nonlinear Theory ◽

Cold Plasma ◽

Spatial Scales ◽

Homogeneous Magnetic Field ◽

Resonant Absorption ◽

Temporal Behaviour ◽

Linear Limit

For a cold plasma that is inhomogeneous (in the direction across an external homogeneous magnetic field), the nonlinear equation describing the spatial structure and temporal behaviour of a non-stationary disturbance in a resonance layer is obtained. The matching conditions for a disturbance through the resonance layer are obtained, and in the linear limit give a well-known linear matching. It is shown that the spatial and temporal behaviour of the resonance disturbance and the evolution of the resonant absorption in terms of nonlinear theory are determined by the ratio of the nonlinear to linear non-stationary spatial scales. The spatial–temporal profile of the disturbance in the resonance layer and the resonant absorption for different values of this ratio are calculated. A nonlinear decrease in the resonant absorption and a stratification of the resonance disturbance are revealed.

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Waves in a cold plasma with spatially periodic sheared fields

Journal of Plasma Physics ◽

10.1017/s0022377800014239 ◽

1989 ◽

Vol 42 (1) ◽

pp. 153-164 ◽

Cited By ~ 2

Author(s):

D. A. Diver ◽

E. W. Laing ◽

C. C. Sellar

Keyword(s):

Magnetic Field ◽

Wave Propagation ◽

Cold Plasma ◽

Density Fluctuations ◽

Rotating Magnetic Field ◽

Physical Parameters ◽

Order Ordinary Differential Equation ◽

Spatially Periodic ◽

Constant Magnitude ◽

The Magnetic Field

We have studied wave propagation in a cold plasma, in the presence of a spatially rotating magnetic field of constant magnitude. New features introduced by this variation include streaming velocities and a plasma current in equilibrium and density fluctuations. We present only the case of wave propagation along the axis of rotation of the magnetic field. A set of ordinary differential equations for the electric field components is obtained, which may be combined into a single fourth-order ordinary differential equation with periodic coefficients. Solutions are obtained in closed form and their nature is determined in terms of the physical parameters of the System, magnetic field strength, number density and wave frequency.

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