Resonant diocotron instability in a non‐neutral plasma with finite mass

1995 ◽  
Vol 2 (4) ◽  
pp. 1077-1083 ◽  
Author(s):  
S. N. Bhattacharyya
Keyword(s):  
Finite Mass ◽  
Diocotron Instability ◽  
Neutral Plasma

Influence of profile shape on the diocotron instability in a non-neutral plasma column

1998 ◽  
Vol 5 (10) ◽  
pp. 3497-3511 ◽  
Author(s):  
Ronald C. Davidson ◽  
Gian Marco Felice
Keyword(s):  
Plasma Column ◽  
Profile Shape ◽  
Diocotron Instability ◽  
Neutral Plasma

Toroidal equilibrium of a non-neutral plasma with toroidal current, inertia and pressure

1992 ◽  
Vol 47 (3) ◽  
pp. 349-359
Author(s):  
S. N. Bhattacharyya ◽  
K. Avinash
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Aspect Ratio ◽  
The Self ◽  
Toroidal Magnetic Field ◽  
Large Aspect Ratio ◽  
Finite Mass ◽  
Neutral Clouds ◽  
Equipotential Surfaces ◽  
Neutral Plasma

Equilibrium of non-neutral clouds in a toroidal vessel with toroidal magnetic field is demonstrated in the presence of a toroidal current, finite mass and finite pressure. With a toroidal current, it is shown that in a large-aspect-ratio conducting torus the equilibrium is governed by competition between forces produced by image charges and image currents. When (where Er and Bθ are the self electrostatic and self magnetic fields of the cloud), the confinement is electrostatic and plasma shifts inwards; when the confinement is magnetic and plasma shifts outwards. For there is no equilibrium. With finite mass or finite pressure, it is shown, in a large-aspectratio approximation, that the fluid drift surfaces and equipotential surfaces are displaced with respect to each other. In both cases the fluid drift surfaces are shifted inwards from the equipotential surfaces.

scholarly journals Magnetic Confinement of an Ultracold Neutral Plasma

2021 ◽  
Vol 126 (8) ◽  
Author(s):  
G. M. Gorman ◽  
M. K. Warrens ◽  
S. J. Bradshaw ◽  
T. C. Killian
Keyword(s):  
Magnetic Confinement ◽  
Neutral Plasma

scholarly journals Anomalous Beam Transport through Gabor (Plasma) Lens Prototype

2021 ◽  
Vol 11 (10) ◽  
pp. 4357
Author(s):  
Toby Nonnenmacher ◽  
Titus-Stefan Dascalu ◽  
Robert Bingham ◽  
Chung Lim Cheung ◽  
Hin-Tung Lau ◽  
...  
Keyword(s):  
Cost Effective ◽  
Stable Operation ◽  
High Electron ◽  
Beam Transport ◽  
Focusing Effect ◽  
Energy Proton ◽  
Diocotron Instability ◽  
Strong Focusing ◽  
Axis Rotation ◽  
Mev Protons

An electron plasma lens is a cost-effective, compact, strong-focusing element that can ensure efficient capture of low-energy proton and ion beams from laser-driven sources. A Gabor lens prototype was built for high electron density operation at Imperial College London. The parameters of the stable operation regime of the lens and its performance during a beam test with 1.4 MeV protons are reported here. Narrow pencil beams were imaged on a scintillator screen 67 cm downstream of the lens. The lens converted the pencil beams into rings that show position-dependent shape and intensity modulation that are dependent on the settings of the lens. Characterisation of the focusing effect suggests that the plasma column exhibited an off-axis rotation similar to the m=1 diocotron instability. The association of the instability with the cause of the rings was investigated using particle tracking simulations.

scholarly journals Chimera Spectrum Diagnostics for Peptides Using Two-Dimensional Partial Covariance Mass Spectrometry

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3728
Author(s):  
Taran Driver ◽  
Nikhil Bachhawat ◽  
Leszek J. Frasinski ◽  
Jonathan P. Marangos ◽  
Vitali Averbukh ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Peptide Sequence ◽  
Two Dimensional ◽  
Peptide Ions ◽  
Finite Mass ◽  
Protein Database ◽  
Spectra Analysis ◽  
Fragment Ions ◽  
Single Precursor ◽  
The Common

The rate of successful identification of peptide sequences by tandem mass spectrometry (MS/MS) is adversely affected by the common occurrence of co-isolation and co-fragmentation of two or more isobaric or isomeric parent ions. This results in so-called `chimera spectra’, which feature peaks of the fragment ions from more than a single precursor ion. The totality of the fragment ion peaks in chimera spectra cannot be assigned to a single peptide sequence, which contradicts a fundamental assumption of the standard automated MS/MS spectra analysis tools, such as protein database search engines. This calls for a diagnostic method able to identify chimera spectra to single out the cases where this assumption is not valid. Here, we demonstrate that, within the recently developed two-dimensional partial covariance mass spectrometry (2D-PC-MS), it is possible to reliably identify chimera spectra directly from the two-dimensional fragment ion spectrum, irrespective of whether the co-isolated peptide ions are isobaric up to a finite mass accuracy or isomeric. We introduce ‘3-57 chimera tag’ technique for chimera spectrum diagnostics based on 2D-PC-MS and perform numerical simulations to examine its efficiency. We experimentally demonstrate the detection of a mixture of two isomeric parent ions, even under conditions when one isomeric peptide is at one five-hundredth of the molar concentration of the second isomer.

Non-modal analysis of the diocotron instability: Cylindrical geometry

2013 ◽  
Vol 20 (4) ◽  
pp. 042101 ◽  
Author(s):  
V. V. Mikhailenko ◽  
Hae June Lee ◽  
V. S. Mikhailenko ◽  
N. A. Azarenkov
Keyword(s):  
Modal Analysis ◽  
Cylindrical Geometry ◽  
Diocotron Instability
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