High conductivity magnetic tearing instability

1976 ◽  
Vol 19 (10) ◽  
pp. 1591 ◽  
Author(s):  
Mark A. Cross ◽  
Gerard Van Hoven
Keyword(s):  
High Conductivity ◽  
Tearing Instability ◽  
Magnetic Tearing

Spectral analysis of turbulent effects on resistivity and the tearing instability

1988 ◽  
Vol 40 (3) ◽  
pp. 517-533 ◽  
Author(s):  
D. Deeds ◽  
G. van Hoven
Keyword(s):  
Numerical Simulation ◽  
Spectral Analysis ◽  
Energy Balance ◽  
Anomalous Resistivity ◽  
Tearing Mode ◽  
Simulation Code ◽  
System A ◽  
Tearing Instability ◽  
True Resistivity ◽  
Magnetic Tearing

Biskamp and Welter (1983) have defined an anomalous resistivity due to shortwavelength turbulence. They reported that this resistivity can be of either sign, and that negative anomalous resistivity in particular can affect the growth of the tearing instability. We use a spectral numerical-simulation code and ancillary diagnostics to analyse the behaviour of resistive magnetic tearing in the presence of turbulence of the sort postulated by Biskamp and Welter. We find that, in general, the ‘anomalous resistivity’ tends to return quickly towards zero even when artificially supported away from zero, and that its effect on tearing-mode behaviour is not consistent with its interpretation as a resistivity. We investigate analytically the behaviour reported by Biskamp and Welter, and the behaviour we observe. We also argue that, while not meaningful as a true resistivity, the ‘anomalous-resistivity’ parameter is a useful diagnostic showing the energy balance of the System – a property we refer to as Alfvénicity – illustrating, for example, the onset of nonlinearity in the tearing process.

Turbulent excitation of spontaneous reconnection

1989 ◽  
Vol 42 (2) ◽  
pp. 269-290 ◽  
Author(s):  
D. Deeds ◽  
G. Van Hoven
Keyword(s):  
Nonlinear Evolution ◽  
Turbulence Energy ◽  
Tearing Mode ◽  
Computational System ◽  
Turbulent Environment ◽  
Tearing Instability ◽  
Magnetic Tearing ◽  
The Relationship ◽  
Initial Turbulence

We explore the long-term nonlinear evolution of a tearing-mode-unstable sheared-field plasma in a turbulent environment. Two different physical configurations are modeled, and a different computational system is used for each. Results of both sets of calculations show that magnetic tearing arises spontaneously provided that the initial turbulence energy level is below the natural saturation level of the tearing instability.We discuss briefly the relationship between our results and those of previous calculations, concluding that there are no significant unexplainable disagreements.

ANACONDA ALLOY 1870

Alloy Digest ◽  
1976 ◽  
Vol 25 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
Hydrogen Embrittlement ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Conductivity ◽  
Reducing Atmosphere

Abstract ANACONDA Alloy 1870 is a free-cutting high-conductivity copper. It is a deoxidized copper with lead added to impart free-cutting properties. The various and unusual properties of Alloy 1870 make it suitable for many applications in the manufacture of parts machined from rods and for current-carrying studs, nuts and bolts designed for use at normal temperatures. Because it is deoxidized, it is not susceptible to hydrogen embrittlement if heated in a reducing atmosphere. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-318. Producer or source: Anaconda American Brass Company.

CHASE 14310

Alloy Digest ◽  
1977 ◽  
Vol 26 (10) ◽  
Keyword(s):  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Heat Treating ◽  
Thermal Softening ◽  
High Conductivity ◽  
Wide Range

Abstract CHASE 14310 is a high-conductivity copper with excellent resistance to thermal softening. It is a deoxidized, electronic grade of copper with excellent formability, weldability and plateability. It is available in strip form and has a wide range of applications. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: Cu-341. Producer or source: Chase Brass & Copper Company Inc..

ALCOA 1XXX SERIES

Alloy Digest ◽  
2005 ◽  
Vol 54 (7) ◽  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
High Purity ◽  
High Conductivity ◽  
Good Corrosion Resistance

Abstract Aluminum 1xxx series alloys are nonhardenable by heat treatment. They have high purity, high conductivity, and good corrosion resistance and are easily formed. This datasheet provides information on composition, physical properties, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, machining, joining, and surface treatment. Filing Code: AL-395. Producer or source: Alcoa Engineered Products.

MUELLER ALLOY 1450

Alloy Digest ◽  
1980 ◽  
Vol 29 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Pure Copper ◽  
Heat Treating ◽  
High Conductivity ◽  
General Corrosion ◽  
Temperature Performance ◽  
Screw Machine ◽  
Machining Characteristics

Abstract MUELLER Alloy 1450 (formerly MBCo Alloy 799) is a high-conductivity copper containing sufficient small copper telluride particles to provide free-machining characteristics superior to those of any other high-conductivity copper. It has the same general corrosion resistance as copper. It is used widely for electrical or thermal conductors requiring extensive machining and for screw-machine products requiring a color that matches pure copper. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-389. Producer or source: Mueller Brass Company.

OLIN C195

Alloy Digest ◽  
2000 ◽  
Vol 49 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Strength ◽  
Heat Treating ◽  
High Conductivity

Abstract Olin C195 is a high-strength, high-conductivity copper alloy developed for applications in current-carrying parts. Typical applications are electrical springs, connectors, and clips. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: CU-649. Producer or source: Olin Brass.

KEMPER C688

Alloy Digest ◽  
2017 ◽  
Vol 66 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Performance ◽  
High Conductivity ◽  
Bend Strength ◽  
Very High

Abstract Alloy C688 is a high-performance copper alloy with very high conductivity. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength. It also includes information on corrosion resistance as well as forming and joining. Filing Code: Cu-867. Producer or source: Gebr. Kemper GmbH + Company KG Metallwerke.

KEMPER KHP7025

Alloy Digest ◽  
2017 ◽  
Vol 66 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Performance ◽  
High Conductivity ◽  
Bend Strength ◽  
Very High

Abstract Alloy KHP 7025 (UNS C70250) is a high-performance copper alloy with very high conductivity. Uses include connector springs, tabs, contact springs, switches, relays, and leadframes. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: Cu-865. Producer or source: Gebr. Kemper GmbH + Company KG Metallwerke.

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