Improvement of magnetic probe measurements

1970 ◽  
Vol 48 (11) ◽  
pp. 1370-1377
Author(s):  
F. L. Curzon ◽  
J. Pachner Jr. ◽  
Y. K. S. Tam
Keyword(s):  
Magnetic Field ◽  
Cross Section ◽  
Current Flow ◽  
Circular Cross Section ◽  
Single Coil ◽  
Fractional Error ◽  
Z Pinch ◽  
Perturbed Magnetic Field ◽  
The Magnetic Field ◽  
Probe Measurements

By considering the current flow around a probe guide of a circular cross section, it is shown that the perturbed magnetic field can be partially "corrected" with a three coil probe. The theory has been tested in a coaxial cylindrical geometry, an analogue of a Z-pinch discharge. The spatial resolution l of the three coil probe is roughly one half of the probe guide radius, a. For current distributions which vary slowly with distance (scale length, λ) it is shown that the fractional error in the magnetic field is ~ 0.2(l/λ)2. For a single coil probe the error is at least four times as large.

The evolution of magnetic flux ropes in sheared plasma flows

2000 ◽  
Vol 64 (1) ◽  
pp. 41-55 ◽  
Author(s):  
J. M. SCHMIDT ◽  
P. J. CARGILL
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Shear Layer ◽  
Cross Section ◽  
Circular Cross Section ◽  
Flux Rope ◽  
Plasma Pressure ◽  
Magnetic Flux Ropes ◽  
Flux Ropes ◽  
The Magnetic Field

The evolution of magnetic flux ropes in a sheared plasma flow is investigated. When the magnetic field outside the flux rope lies parallel to the axis of the flux rope, a flux rope of circular cross-section, whose centre is located at the midpoint of the shear layer, has its shape distorted, but remains in the shear layer. Small displacements of the flux-rope centre above or below the midpoint of the shear layer lead to the flux-rope being expelled from the shear layer. This motion arises because small asymmetries in the plasma pressure around the flux-rope boundary leads to a force that forces the flux rope into a region of uniform flow. When the magnetic field outside the flux rope lies in a plane perpendicular to the flux-rope axis, the flux rope and external magnetic field reconnect with each other, leading to the destruction of the flux rope.

Excitation of a conducting cylinder by an axial electric dipole

1968 ◽  
Vol 46 (3) ◽  
pp. 211-219
Author(s):  
L. Shafai
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Cross Section ◽  
Electric Dipole ◽  
Circular Cross Section ◽  
Conducting Cylinder ◽  
Infinite Integral ◽  
The Magnetic Field

The electromagnetic field of an axial electric dipole near a perfectly conducting cylinder of circular cross section is expressed in terms of an infinite integral. For the magnetic field on the surface of the cylinder, the integral is evaluated analytically for cylinders of small and large radii and numerically for cylinders of moderate radii.

Dynamic Self-Assembly in Confined Micro-Domains

2004 ◽  
Author(s):  
Dong Liu ◽  
Martin Maxey ◽  
George Karniadakis
Keyword(s):  
Magnetic Field ◽  
Cross Section ◽  
Self Assembly ◽  
Three Dimensional ◽  
Circular Cross Section ◽  
Self Assembled ◽  
Paramagnetic Beads ◽  
Exciting Possibility ◽  
The Magnetic Field

We simulate dynamic self-assembly of paramagnetic beads in domains of rectangular, triangular and circular cross-section. We demonstrate that depending on the magnetic field, the number of microparticles, and the shape of microdomain, different self-assembled structures can be produced. This provides an exciting possibility for making reconfigurable multi-functional microdevices, and may also suggest new protocols for fabricating three-dimensional microsystems and nanosystems.

Axialsymmetrische Lösungen der magnetohydrostatischen Gleichung mit Oberflächenströmen II

1958 ◽  
Vol 13 (7) ◽  
pp. 493-498 ◽  
Author(s):  
K. Jörgens
Keyword(s):  
Magnetic Field ◽  
Cross Section ◽  
Circular Cross Section ◽  
Arbitrary Cross Section ◽  
Axially Symmetric ◽  
Equilibrium Configurations ◽  
Circular Case ◽  
Axis Of Symmetry ◽  
Hydrodynamic Equilibrium ◽  
The Magnetic Field

Axially symmetric magneto-hydrodynamic equilibrium configurations are considered where the plasma is contained in a torus of arbitrary cross-section and electric currents flow in the surface of the plasma only. It is shown that the magnetic field is uniquely determined by the values of the total current in azimuthal and in meridional direction respectively and by the gas pressure. A method is given to compute the location of discontinuities of the magnetic field outside of the torus. The singularities are found explicitly in the case of elliptic or circular cross-section. In the circular case only the magnetic field is regular everywhere outside except on the axis of symmetry.

Study of MFM Application in Semiconductor Failure Analysis

2004 ◽  
Author(s):  
Way-Jam Chen ◽  
Lily Shiau ◽  
Ming-Ching Huang ◽  
Chia-Hsing Chao
Keyword(s):  
Magnetic Field ◽  
Failure Analysis ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Current Flow ◽  
Force Microscopy ◽  
The Magnetic Field ◽  
A Current

Abstract In this study we have investigated the magnetic field associated with a current flowing in a circuit using Magnetic Force Microscopy (MFM). The technique is able to identify the magnetic field associated with a current flow and has potential for failure analysis.

scholarly journals THREE-BODY PHOTODISINTEGRATION OF 4He NUCLEUS BY LINEARLY POLARIZED PHOTONS

2019 ◽  
pp. 11-15
Author(s):  
A.A. Peretiatko ◽  
R.T. Murtazin ◽  
A.F. Khodyachikh
Keyword(s):  
Magnetic Field ◽  
Cross Section ◽  
Production Cross ◽  
Reaction Products ◽  
Azimuthal Distribution ◽  
Proton Production ◽  
Linearly Polarized ◽  
Three Body ◽  
Polarized Photons ◽  
The Magnetic Field

Experimental data are reported from studies of the reaction 4He(γ, pn)d through the use of the streamer chamber placed in the magnetic field and exposed to a linearly polarized photon beam from the electron linac LUE-2000. A structure has been revealed in the momentum distribution of deuterons. Studies were made into the effects of nucleon-deuteron correlation. The azimuthal distribution of reaction products and the asymmetry of proton production cross-section were measured. The obtained data were analyzed in the framework of the quasideuteron model.

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