Generation and Motion of Plasmoids in a Magnetic Field with Mirrors

Jones, W. B.; Miller, RB

doi:10.1063/1.1692142

Cited by 21 publications

(10 citation statements)

References 6 publications

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“…5 ' 8 The most stable plasma states are structures with a large part of their total energy in the form of mass-flow energy. Some of these properties of the cells have been extensively investigated by others, and the results obtained verify in detail the results of Wells, Jones and Miller, 9 Turner, 10 and Small and Bostick. 11 Difficulties have been encountered in the past in attempting to couple the primary currents in the conical theta-pinch guns to the secondary currents in the plasma rings.…”

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confidence: 75%

Adiabatic Compression of Plasma Vortex Structures

et al. 1974

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out, however, that no correction for ExB drifts has been made, because the plasma potential is not known for these discharges.Attempts were made to compare the experimental results with the predictions for the m = 1 internal kink mode. 4 * 5 Pictures like Fig. 3 suggest an experimental growth rate y « 3x 10 3 sec" 1 . The theoretical linear growth rate depends on the exact radial dependence of q. For parabolic temperature profiles (n e = const, j~T e 3/2 ) we derive from Eq. (13) of Ref. 5where v A is the Alfven velocity, R the major radius, p z0 the toroidal j9 in the center of the column, and r s the radius of the singular surface (q = 1). This formula gives a value of y^e oT equal to 2x 10 4 sec" 1 , which is larger than the experimental growth rate by a factor of about 7.We can also compare the radial profile of the oscillation amplitude [Fig. 2(d)] with the prediction for the internal kink mode, i.e., displacement | = const for rr s . The x-ray signal is the integral over the x-ray sources along a line of sight. To obtain the x-ray radial profile a set of scans at different lines of sight have been inverted. Without going into the details, we state that the shape of the profile is in reasonable agreement with the theoretical prediction. The experimental displacement |, however, seems to be larger than the predicted non-Over the past fourteen years, an extensive series of experiments concerned with naturally occurring stable plasma states has been performed. 1 " 6 We have intensively studied, both theoretically and experimentally, a whole new field of plasma physics concerned with the problem of production, heating, and application of these states.linear displacement of Ref* 5 by approximately an order of magnitude. Experimentally we obtain £/r 5 « 0.2. It should be pointed out that resistivity is not included in the present theory and that it is likely that a tearing-mode version of this instability exists (Ref. 5, p. 1899) which might lead to smaller growth rates and larger displacements.The technical assistance of W. Mycock and the ST tokamak operating crew is gratefully acknowledged.A theory has been developed which predicts a spectrum of naturally occurring stable states. 5,7,B The particular stable state studied at the University of Miami consists of a closed plasma structure produced by conical theta-pinch guns. This state is the force-free collinear vortex ring or spheroid first described by Wells. 1 ' 2 Plasma vortex structures generated by conical theta-pinch guns have been successfully compressed and amplified by secondary adiabatic compression. A pair of vortex rings meet at the center of a primary magnetic mirror. A secondary mirror starts to compress them as soon as the collision has occurred. Peak ion temperatures of 170 eV have been obtained at an nr of 10 12 sec/cm 3 by utilizing a capacitor bank that stores 250 kJ.1203

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confidence: 75%

Adiabatic Compression of Plasma Vortex Structures

et al. 1974

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“…Indeed, FRC formation has been initiated by using either rotating magnetic fields [9] or a coaxial geometry [10]. Conversely, theta pinches with reversed bias magnetic fields have been used to form spheromaks, either by a combination of axial and azimuthal currents [11,12] or with strongly conical coils [13]. However, the vast majority of the FRC research reviewed here involves theta pinch formation.…”

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confidence: 99%

Field reversed configurations

1988

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The review is devoted to field reversed configurations and to the related field reversed mirrors; both are compact toroids with little or no toroidal magnetic field. Experimental and theoretical results on the formation, equilibrium, stability and confinement properties of these plasmas are presented. Although they have been known for about three decades, field reversed configurations have been studied intensively only in recent years. This renewed interest is due to the unusual fusion reactor potential of these high beta plasmas and also to their surprising macroscopic stability. At the present time, field reversed configurations appear to be completely free of gross instabilities and show relatively good confinement. The primary research goal for the near future is to retain these favourable properties in a less kinetic regime. Other important issues include the development of techniques for slow formation and stability, and a clearer assessment of the confinement scaling laws.

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“…Mirror reflection and trapping of a field-reversed ring having a total energy of a few joules has been achieved by Jones ;\r\A Miller (1968).…”

Section: Beta H Plasma Gunmentioning

confidence: 99%

Tandem Mirror and Field-Reversed Mirror Experiments

Coensgen

Simonen

Turner

1981

Physics of Plasmas Close to Thermonuclear Conditions

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Mn 11 i p ' ''-mi rmr syst cris nf f(.r si gn i fi mut '>nhanr< ranrt of the power ha lance ,-rbove t hiii a t tat nahle from a coiwe-nri nna 1 • « i nglcco M mi rmr mac tor. Several mn] t ipi .-•-mi rmr eon f i ,'iirat ions are under experiment.! 1 invest i f>.*it ion : tlic t a mien mi rr-ir. •'•<• high-deisitv mil 11 iple-mi rm>-, and the ftV 1 J-reversed TFI rror. Tttix paper i •-1 .in-.e lv i!fvot'-H to random mi rrnr and f if Id-rev or soil mi r rnr exper iment.i at the ;,fiwr.'n-<• I.iyi>njinn' I.ab nr.i torv (I.I.I.), and briefly summarizes results nf expni-i"iont e i-i which field-reversal has heen ach ieved. In the tandem Pitperini.nl, h ip,h-eneri>v, i,; |.i-.| ••) :ity pl.ismas (nearly identi'-al to ?XIIB plasmas) are 1 neat ft! at racii end i-' ,i s-r), and I-IIT troiis an* HPC trostat i cal 1 v con fined bv tho nvi-ra 11 pnsi t i ve potf-nt ia I of tln> system, The field-ri vnrscd ni rror reac tor cons isl s nf qrvr-rn ! smal 1 l"i i' ld-rove rsed mi rror plasmas 1 i nked together fnr economic n-a sons. In I he 1.1.!. R.'l.i 11 experiment, j;eno ral i on of a Mn Id-reve tse.d plasma rinc will he jnvr"-tigat-d using a hii*h-enerf>v plasma Run with n transverse radial m.-u*,n"'ie field. This plasma will he further heated and sustained hv injection-if. nl-'im,., hiph-••n< r-Rv neutral hf.ms.

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Generation and Motion of Plasmoids in a Magnetic Field with Mirrors

Cited by 21 publications

References 6 publications

Adiabatic Compression of Plasma Vortex Structures

Adiabatic Compression of Plasma Vortex Structures

Field reversed configurations

Tandem Mirror and Field-Reversed Mirror Experiments

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