Current distribution between an X-pinch and a current-return rod or parallel X-pinches

2013 ◽  
Author(s):  
S. Zhao ◽  
X. Zou ◽  
X. Wang ◽  
X. Zhu
Keyword(s):  
Current Distribution ◽  
Current Return ◽  
A Current

Spherical tensor approach to multipole expansions. II. Magnetostatic interactions

1976 ◽  
Vol 54 (5) ◽  
pp. 513-518 ◽  
Author(s):  
C. G. Gray ◽  
P. J. Stiles
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Interaction Energy ◽  
Current Distribution ◽  
Spherical Harmonic ◽  
Magnetostatic Interaction ◽  
Multipole Expansions ◽  
The Magnetic Field ◽  
A Current ◽  
Magnetostatic Interactions

The magnetic field due to a given current distribution, the interaction energy of a current distribution with an arbitrary external magnetic field, and the magnetostatic interaction energy between two current distributions are decomposed into multipolar components using spherical harmonic expansions. Diamagnetic interactions and the spin contributions to the multipole expansions are also discussed.

A model for precursor structure in supercritical perpendicular, collisionless shock waves

1978 ◽  
Vol 20 (2) ◽  
pp. 265-279
Author(s):  
D. Sherwell ◽  
R. A. Cairns
Keyword(s):  
Magnetic Field ◽  
Shock Waves ◽  
Wave Velocity ◽  
Current Distribution ◽  
Trapped Ions ◽  
Collisionless Shock ◽  
Precursor Structure ◽  
Insight Into ◽  
A Current

Magnetosonic solitons may be given smooth increasing profiles by assuming the presence within the wave of a current distribution Jy(x) of trapped ions perpendicular to Bz(x) and the wave velocity Vx. Suitable ions are found immediately upstream of perpendicular, collisionless shock waves and these are coincident with the often observed ‘foot’ in magnetic field profiles of moderately supercritical shocks. By modelling Jy(x) we apply the theory to previous experiments where Jy(x) is observed, and are able to reproduce reasonably, and thus explain, the profiles in the foot. Insight into a number of features of fast shocks is obtained.

Dependence of Switching Current Distribution of a Current-Biased Josephson Junction on Microwave Frequency

2015 ◽  
Vol 32 (4) ◽  
pp. 047402 ◽  
Author(s):  
Ji-Quan Zhai ◽  
Yong-Chao Li ◽  
Jian-Xin Shi ◽  
Yu Zhou ◽  
Xiao-Hu Li ◽  
...  
Keyword(s):  
Josephson Junction ◽  
Current Distribution ◽  
Microwave Frequency ◽  
Switching Current ◽  
A Current

On the new monotypic wolf spider genus Ovia gen. nov. (Araneae: Lycosidae, Lycosinae)

Zootaxa ◽  
2017 ◽  
Vol 4221 (3) ◽  
pp. 366 ◽  
Author(s):  
PRADEEP M. SANKARAN ◽  
JOBI J. MALAMEL ◽  
POTHALIL A. SEBASTIAN
Keyword(s):  
Sexual Dimorphism ◽  
Current Distribution ◽  
Type Species ◽  
New Genus ◽  
Wolf Spider ◽  
Distribution Map ◽  
Apical Process ◽  
Mating Plug ◽  
Relationship Of ◽  
A Current

A new monotypic wolf spider genus, Ovia gen. nov. is proposed to accommodate a misplaced species: Pardosa procurva Yu & Song, 1988. Ovia procurva comb. nov. is redescribed, illustrated and designated as the type species for the genus. The subfamily placement of the new genus is discussed and it is considered as a member of Lycosinae Sundevall, 1833 and possibly closely related to Alopecosa Simon, 1885. The presence of an apical process (spur) on the median apophysis is proposed as the putative synapomorphy of Ovia gen. nov. The possible sister-taxon relationship of Ovia gen. nov. with Alopecosa is discussed and evidence on the occurrence of sexual dimorphism and mating plug within the genus are presented. Ovia gen. nov. is assumed to be of Holarctic origin, from which it has migrated to the Indomalayan region. Additionally, a current distribution map for the genus is provided. 

scholarly journals Conditions for a pure toroidal dipole source

2021 ◽  
Vol 2015 (1) ◽  
pp. 012027
Author(s):  
Adrià Canós Valero
Keyword(s):  
Dipole Moment ◽  
Current Distribution ◽  
Electric Dipole ◽  
Spherical Surface ◽  
Physical Significance ◽  
Dipole Source ◽  
Multipole Moments ◽  
Physical Origin ◽  
First Time ◽  
A Current

Abstract Recently, the physical significance of dynamic toroidal multipoles in the context of electrodynamics has been put under discussion. Indeed, the latter can be shown to arise simply from a Taylor series of the exact source (Cartesian) multipole moments. The split into elementary and toroidal parts was demonstrated to lead to an unphysical result were forbidden components of the momentum transform of the current could radiate into free space. In this contribution, we elaborate the conditions that a current distribution must necessarily satisfy to be considered a ‘pure’ toroidal dipole source. We demonstrate for the first time that symmetry prevents such current distribution to radiate as an elementary electric dipole moment, without leading to an unphysical result. Thus, while both elementary electric dipole and toroidal dipoles are indistinguishable outside the source, they display topologically distinct characteristics within the smallest spherical surface enclosing the source itself and have different physical origin. Based on our results, a pure ‘toroidal’ source can be designed. We believe the outcome of our investigations will help clarify further the formal meaning of the toroidal multipoles.

Stromverteilung und Materiemitführung bei der Hohlpincherzeugung mit kondensierten Stickstoff-Molekularstrahlen / Current Distribution and Mass Pickup during a Hollow Dynamic Pinch Discharge in Condensed Molecular Beams of Nitrogen

1972 ◽  
Vol 27 (10) ◽  
pp. 1406-1409 ◽  
Author(s):  
E. W. Becker ◽  
R. Klingelhöfer ◽  
J. Wüst
Keyword(s):  
Current Distribution ◽  
Rapid Development ◽  
Molecular Beams ◽  
Cluster Beam ◽  
Current Sheath ◽  
Time Curve ◽  
Electrodynamic Forces ◽  
Z Pinch ◽  
A Current ◽  
Probe Measurements

Abstract The current distribution during a z-pinch discharge in a hollow cylindrical beam of nitrogen clusters is determined by magnetic probe measurements. After breakdown a current sheath arises within the ring-shaped cross section of the cluster beam. During the discharge the sheath is accelerated radially inward towards the axis. Simultaneously the radial collapse of a hollow luminosity pattern is observed by image converter photographs. The arrival of the current sheath at the axis coincides with the rapid development of a luminous core in the photographs. The radius-time curve of the sheath is calculated with the measured density of the electrodynamic forces neglecting pressure terms. Comparison of the observed and the calculated radius-time curves seems to indicate that most of the injected mass of the cluster beam is swept inward by the pinch discharge.

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