Computational aspects of simulating megagauss-magnetic-field-induced plasma formation on Thick-wire metallic surfaces

2011 ◽  
Author(s):  
Irvin R. Lindemuth ◽  
Richard E. Siemon ◽  
Bruno S. Bauer ◽  
Walter L. Atchison
Keyword(s):  
Magnetic Field ◽  
Plasma Formation ◽  
Metallic Surfaces ◽  
Computational Aspects ◽  
Thick Wire

scholarly journals Magnetic properties of supraconductors

1936 ◽  
Vol 154 (882) ◽  
pp. 378-385 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
External Magnetic Field ◽  
Copper Wire ◽  
Thermal Contact ◽  
Threshold Value ◽  
Test Tube ◽  
The Other ◽  
Longitudinal Field ◽  
Thick Wire

Mendelssohn and Babbitt observed that the induction in solid and hollow tin spheres which became supraconductive in an external magnetic field did not fall quite to zero, but that part of the magnetic flux was “frozen in” at the threshold value. This behaviour could be explained by considerations based on the shape of the specimen, although it was not certain if this was the only reason for the effect. It seemed therefore that it would be of interest to investigate specimens of a shape which assured simpler conditions, such as long rods in a longitudinal field, in addition to extending the experiments to a greater number of supraconducting substances. Method The same two helium liquefiers with which the previous experiments were carried out were used again. The specimens employed were in the form of long rods attached by a short thick wire of electrolytic copper to the helium container. The wire was autogenously welded to one end of the specimen, the other end of the copper wire being soldered to the helium container. In the case of mercury the metal was contained in a test tube held independently, into which a copper wire dipped and made thermal contact. A coil one layer thick of 47 s. w. g. copper wire was wound round the middle of each specimen, the ends being connected to a ballastic galvanometer.

scholarly journals The secondary corpuscular rays produced by homogeneous X-rays

1923 ◽  
Vol 104 (727) ◽  
pp. 455-479 ◽  
Keyword(s):  
Magnetic Field ◽  
Photographic Plate ◽  
High Vacuum ◽  
Radius Of Curvature ◽  
X Rays ◽  
Metallic Surfaces ◽  
Philosophical Magazine ◽  
Narrow Strip ◽  
Definition Of ◽  
The Magnetic Field

In the summer of 1914 I began, with the assistance of Mr. W. F. Rawlinson, an investigation of the velocities of the secondary cathode particles ejected from metallic surfaces by X-rays of known frequency. The source of X-rays then available was not very powerful, and little progress had been made when the work was interrupted by the war. A preliminary account of the experimental method, and of the few results which had been obtained, was communicated to the ‘ Philosophical Magazine,' and published in August, 1914. Briefly, the method consisted in exposing a narrow strip of metal to the beam of X-rays, and using a uniform magnetic field to bend the stream of ejected electrons onto a photographic plate, the experiment being performed in a high vacuum. The product r H, where H is the strength of the magnetic field and r the radius of curvature of the path of an electron moving normally to the field, is characteristic of that electron : from it the kinetic energy of the electron may readily be calculated. A special focussing device was used, and described in the paper referred to, by means of which quite a wide beam of electrons could be employed without impairing the definition of the resulting image on the photographic plate: this device not only appreciably shortens the exposures required, but also enhances the effect of the rays under investigation, relatively to that of the general scattered radiations. These latter are always troublesome, and cannot be entirely eliminated.

scholarly journals Role of deflection magnetic field in hydrogen ionic plasma formation

AIP Advances ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 095006
Author(s):  
W. Oohara ◽  
T. Kaji ◽  
K. Hirose ◽  
M. Fujii ◽  
R. Watano ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Plasma Formation

scholarly journals Use of the Relaxometry Technique for Quantification of Paramagnetic Ions in Aqueous Solutions and a Comparison with Other Analytical Methods

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Bruna Ferreira Gomes ◽  
Juliana Soares da Silva Burato ◽  
Carlos Manuel Silva Lobo ◽  
Luiz Alberto Colnago
Keyword(s):  
Magnetic Field ◽  
Analytical Methods ◽  
Visible Region ◽  
Homogeneous Magnetic Field ◽  
Inhomogeneous Magnetic Field ◽  
Metallic Surfaces ◽  
Absorption Bands ◽  
Limit Of Quantification ◽  
Chemical Indicators ◽  
Paramagnetic Ions

We have demonstrated that the relaxometry technique is very efficient to quantify paramagnetic ions duringin situelectrolysis measurements. Therefore, the goal of this work was to validate the relaxometry technique in the determination of the concentration of the ions contained in electrolytic solutions, Cu2+, Ni2+, Cr3+, and Mn2+, and compare it with other analytical methods. Two different NMR spectrometers were used: a commercial spectrometer with a homogeneous magnetic field and a home-built unilateral sensor with an inhomogeneous magnetic field. Without pretreatment, manganese ions do not have absorption bands in the UV-Visible region, but it is possible to quantify them using relaxometry (the limit of quantification is close to 10−5 mol L−1). Therefore, since the technique does not require chemical indicators and is a cheap and robust method, it can be used as a replacement for some conventional quantification techniques. The relaxometry technique could be applied to evaluate the corrosion of metallic surfaces.

Experimental investigation of thermal plasma formation from thick aluminum surfaces by pulsed multimegagauss magnetic field

2010 ◽  
Vol 17 (10) ◽  
pp. 102507 ◽  
Author(s):  
T. J. Awe ◽  
B. S. Bauer ◽  
S. Fuelling ◽  
I. R. Lindemuth ◽  
R. E. Siemon
Keyword(s):  
Magnetic Field ◽  
Experimental Investigation ◽  
Thermal Plasma ◽  
Plasma Formation ◽  
Aluminum Surfaces

scholarly journals Electric explosion of flat copper conductors in asymmetric and symmetric configurations in the current skinning mode

2021 ◽  
Vol 2064 (1) ◽  
pp. 012028
Author(s):  
N A Labetskaya ◽  
I M Datsko ◽  
S A Chaikovsky ◽  
V A Vankevich ◽  
E V Oreshkin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Studies ◽  
Longitudinal Axis ◽  
Plasma Formation ◽  
Conductor Surface ◽  
Key Issues ◽  
Energy Transportation ◽  
The Magnetic Field ◽  
Asymmetric Configuration ◽  
Good Agreement

Abstract Plasma formation on the surface of conductors as a result of a skin explosion is one of the key issues of the efficiency of energy transportation along the vacuum lines of terawatt-level pulsed generators. Experimental studies of plasma formation on the surface of flat conductors were carried out on the MIG generator (current level ~ 2.5 MA, rise time ~ 100 ns). The magnitude of the magnetic field induction exceeded the values required for the explosion of the conductor surface facing the magnetic field in an asymmetric configuration or both surfaces of the conductor in a symmetric configuration. It was shown that in both configurations, a plasma channel is formed on the surface of a copper foil with a thickness of 100 microns along its longitudinal axis. Experimental data on the dynamics of plasma formation at the edges of a flat conductor have been obtained. A magnetohydrodynamic simulation of an explosion in strong magnetic fields of flat conductors whose width is much greater than their thickness showed that: the expansion of the plasma along the width of the conductor is suppressed, and the plasma expands mainly along its thickness. The simulation results are in good agreement with the experimental once.

scholarly journals The initial stage of the plasma formation at skin explosion of cylindrical conductors

2021 ◽  
Vol 2064 (1) ◽  
pp. 012012
Author(s):  
I M Datsko ◽  
N A Labetskaya ◽  
S A Chaikovsky ◽  
V A Van’kevich ◽  
V I Oreshkin
Keyword(s):  
Magnetic Field ◽  
Magnetic Induction ◽  
Dense Plasma ◽  
Electrical Explosion ◽  
Plasma Formation ◽  
Initial Stage ◽  
Different Diameters ◽  
Cylindrical Conductors ◽  
The Magnetic Field ◽  
Uniform Plasma

Abstract The formation of plasma on the surface of the electrically exploded conductor is a key issue in terms of the energy introduced into the metal substance. The purpose of this work was to study the dynamics of dense plasma formation on the metal surface at magnetic induction values of 200-600 T and its rising rates of (2-6) T/ns. The experiments were carried out on a terawatt MIG generator with current amplitude up to 2.5 MA and rise time of 100 ns. In experiments, skin electrical explosion of cylindrical conductors made of different materials and with different diameters was studied. The formation of plasma on the surface of the conductor was recorded using a four-frame optical camera with an exposure time of 3 ns for each frame. It was shown that when the current increases, “spots” appear on the surface of a cylindrical conductor. These spots are the centers of plasma formation. Later in the time, longitudional plasma channels were registered. In course of subsequent merging of the channels relatively uniform plasma formation occurs. The paper discusses the features of the dynamics of plasma formation as a function of the peak and the rising rate of the magnetic field induction.

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