scholarly journals Diocotron Instability in a Cylindrical Geometry

1965 ◽  
Vol 8 (7) ◽  
pp. 1288 ◽  
Author(s):  
R. H. Levy
Keyword(s):  
Cylindrical Geometry ◽  
Diocotron Instability

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

Non-modal analysis of the diocotron instability for cylindrical geometry with conducting boundary

2014 ◽  
Vol 21 (5) ◽  
pp. 052105 ◽  
Author(s):  
V. V. Mikhailenko ◽  
Jin Seok Kim ◽  
Younghyun Jo ◽  
V. S. Mikhailenko ◽  
Hae June Lee
Keyword(s):  
Modal Analysis ◽  
Cylindrical Geometry ◽  
Diocotron Instability

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.

Ion-Ion Beam Instability in a Cylindrical Geometry

1974 ◽  
Vol 33 (13) ◽  
pp. 754-757 ◽  
Author(s):  
Noah Hershkowitz ◽  
Thomas Romesser ◽  
Georg Knorr ◽  
Christoph K. Goertz
Keyword(s):  
Ion Beam ◽  
Cylindrical Geometry ◽  
Beam Instability

Heat-flow experiments in liquid 4He with a variable cylindrical geometry

1987 ◽  
Vol 174 ◽  
pp. 209-231 ◽  
Author(s):  
H. Gao ◽  
G. Metcalfe ◽  
T. Jung ◽  
R. P. Behringer
Keyword(s):  
Cylindrical Geometry ◽  
Small Scale ◽  
Onset Of Convection ◽  
Aspect Ratios ◽  
A Value ◽  
Prandtl Numbers ◽  
Convection Rolls ◽  
Flow Experiments ◽  
Increasing Function ◽  
Good Agreement

This paper first describes an apparatus for measuring the Nusselt number N versus the Rayleigh number R of convecting normal liquid 4He layers. The most important feature of the apparatus is its ability to provide layers of different heights d, and hence different aspect ratios [Gcy ]. The horizontal cross-section of each layer is circular, and [Gcy ] is defined by [Gcy ] = D/2d where D is the diameter of the layer. We report results for 2.4 [les ] [Gcy ] [les ] 16 and for Prandtl numbers Pr spanning 0.5 [lsim ] Pr [lsim ] 0.9 These results are presented in terms of the slope N1 = RcdN/dR evaluated just above the onset of convection at Rc. We find that N1 is only a slowly increasing function of [Gcy ] in the range 6 [lsim ] [Gcy ] [lsim ] 16, and that it has a value there which is quite close to 0.72. This value of N1 is in good agreement with variational calcuations by Ahlers et al. (1981) pertinent to parallel convection rolls in cylindrical geometry. Particularly for [Gcy ] [lsim ] 6, we find additional small-scale structure in N1 associated with changes in the number of convection rolls with changing [Gcy ]. An additional test of the linearzied hydrodynamics is given by measurements of Rc. We find good agreement between theory and our data for Rc.

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