skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: THE HOMOPOLAR DEVICE

Abstract

Of the many interesting rotational plasma configurations, the Homopolar geometry has thus far received most attention. Here a radial electric field and an axial magnetic field are used to set plasma into azimuthal drift motion. A transient radial current flows during the acceleration stages and this has been used in the experiments reported here to pinch the plasma axially away from insulaiing end plates. The axial magnetic field employed in practice has been of the mirror machine type. The centrifugal force associated with plasma rotation tends to hold the ions away from the axis, and therefore traps them in the region of bulging field. Axial containment is achieved at first by the azimuthal pinch field and later by the centritugal trapping effect. Rotational kinetic energy can be convertee to plasma beating by viscosity or turbulent mixing. These effects, though more powerful than Joule heating, may not suffice to heat a practical thermonuclear devices and axiliary heating methods may have to be applied. As with the toroidal stabilized pinch, a promising containment method has been demonstrated, but the adequacy of selfheating remains to be determined. As in the study of the pinch effect, a natural course of development is from small,more » high-density models to large, low-density machines. A deuterium density of about l0/sup 13/cc should be satisfactory in a thermonuclear reactor. Experimenis were directed exclusively to documenting the physics of totating plasmas. Argon was used for the most pari. Great stress was placed on direct methods of measuring actual plasma rotatdon. Circuit responses have demonstrated particjpation of the entire starting gas in the roiation. Plasma angular momentum has been measured unambiguously as a function of time, by crowbarring'' the machine and observing ihe charge drawn out. lon kinetic energies above 500 ev in argon and 50 ev in deuterium were demonstrated. Doppier- shift measurement; indicate, if anything, still larger energjes. The presence of very high BETA 's was shown by deformation of the starting magnetic field. For 5- mu sec plasma-acceleration times, substantial plasma rotation)ofas been observed up to 80 mu sec later. A larger system, having thermonuclear potentialities, was completed and another is Ring built. An important incidental use of the Homopolar machine is as a fast-discharge capacitor. Dielectric constants oi l0/sup 6/ to 10/sup 7/ were produced with ease, and output-current rates of rise of 5 x l0/sup 11/ amp/sec were generated. (auth)« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
California. Univ., Berkeley. Radiation Lab.
OSTI Identifier:
4268670
Report Number(s):
UCRL-8062
NSA Number:
NSA-13-011000
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Decl. Aug. 21, 1958. Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
CONTROLLED THERMONUCLEAR PROCESSES; ANGULAR MOMENTUM; ARGON; CAPACITORS; CIRCUITS; CONFIGURATION; CONFINEMENT; CURRENTS; DENSITY; DEUTERIUM; DIELECTRICS; ELECTRIC DISCHARGES; ELECTRIC FIELDS; ENERGY; ENERGY RANGE; EV RANGE; HEATING; IONS; MAGNETIC FIELDS; MAGNETIC MIRRORS; MEASURED VALUES; MOMENTUM; PINCH; PLASMA; PLATES; PRESSURE; RESISTORS; ROTATION; SPECTRAL SHIFT; STABILITY; THERMONUCLEAR DEVICES; TURBULENCE; VISCOSITY

Citation Formats

Anderson, O A, Baker, W R, Bratenahl, A, Furth, H P, Ise, J Jr, Kunkel, W B, and Stone, J M. THE HOMOPOLAR DEVICE. United States: N. p., 1958. Web.
Anderson, O A, Baker, W R, Bratenahl, A, Furth, H P, Ise, J Jr, Kunkel, W B, & Stone, J M. THE HOMOPOLAR DEVICE. United States.
Anderson, O A, Baker, W R, Bratenahl, A, Furth, H P, Ise, J Jr, Kunkel, W B, and Stone, J M. Wed . "THE HOMOPOLAR DEVICE". United States.
@article{osti_4268670,
title = {THE HOMOPOLAR DEVICE},
author = {Anderson, O A and Baker, W R and Bratenahl, A and Furth, H P and Ise, J Jr and Kunkel, W B and Stone, J M},
abstractNote = {Of the many interesting rotational plasma configurations, the Homopolar geometry has thus far received most attention. Here a radial electric field and an axial magnetic field are used to set plasma into azimuthal drift motion. A transient radial current flows during the acceleration stages and this has been used in the experiments reported here to pinch the plasma axially away from insulaiing end plates. The axial magnetic field employed in practice has been of the mirror machine type. The centrifugal force associated with plasma rotation tends to hold the ions away from the axis, and therefore traps them in the region of bulging field. Axial containment is achieved at first by the azimuthal pinch field and later by the centritugal trapping effect. Rotational kinetic energy can be convertee to plasma beating by viscosity or turbulent mixing. These effects, though more powerful than Joule heating, may not suffice to heat a practical thermonuclear devices and axiliary heating methods may have to be applied. As with the toroidal stabilized pinch, a promising containment method has been demonstrated, but the adequacy of selfheating remains to be determined. As in the study of the pinch effect, a natural course of development is from small, high-density models to large, low-density machines. A deuterium density of about l0/sup 13/cc should be satisfactory in a thermonuclear reactor. Experimenis were directed exclusively to documenting the physics of totating plasmas. Argon was used for the most pari. Great stress was placed on direct methods of measuring actual plasma rotatdon. Circuit responses have demonstrated particjpation of the entire starting gas in the roiation. Plasma angular momentum has been measured unambiguously as a function of time, by crowbarring'' the machine and observing ihe charge drawn out. lon kinetic energies above 500 ev in argon and 50 ev in deuterium were demonstrated. Doppier- shift measurement; indicate, if anything, still larger energjes. The presence of very high BETA 's was shown by deformation of the starting magnetic field. For 5- mu sec plasma-acceleration times, substantial plasma rotation)ofas been observed up to 80 mu sec later. A larger system, having thermonuclear potentialities, was completed and another is Ring built. An important incidental use of the Homopolar machine is as a fast-discharge capacitor. Dielectric constants oi l0/sup 6/ to 10/sup 7/ were produced with ease, and output-current rates of rise of 5 x l0/sup 11/ amp/sec were generated. (auth)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1958},
month = {1}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: