The origin of the rotation in field-reversed configurations

Tuszewski, M.; Barnes, G.A.; Chrien, R. E.; Hugrass, W. N.; Rej, D. J.; Siemon, R.E.; Wright, B.L.

doi:10.1063/1.866780

Cited by 17 publications

(9 citation statements)

References 19 publications

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“…Several observations are consistent with the end-shorting theory [318], such as increased values of T S for larger coil lengths [72,73,80,115,19,329,313] and fill pressures [92,130,114]. On the STP-L device, direct X (US) 50 [331]. The symbols are explained in Table III. measurements of edge layer rotation and of the delay in T S with guide fields at the ends of the theta pinch coil give partial support for the end-shorting process' [329] and also for particle transport [330].…”

Section: Origin Of the Rotationsupporting

confidence: 64%

“…It is the portion of the FRC that is MHD stable, and it may influence the unstable portion of the FRC, in particular for large separatrix pressures and axial flows near the ends. The edge layer may be the key to the origin and, therefore, the control of FRC rotation [318,352,331]. The edge layer also strongly influences the confinement properties of present FRCs.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Origin Of the Rotationsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Field reversed configurations

1988

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“…4 As a destructive instability which limits the configuration's lifetime, rotational instability with toroidal mode number n = 2 is found only in experimentally generated FRCs. [6][7][8][9] More recently, numerical studies have also revealed a relationship to exist between ion spin-up and resistive decay of magnetic flux. It is generally believed that the configuration lifetime comes to an end due to contact of the core plasma with the chamber wall due to this elliptical deformation.…”

Section: Introductionmentioning

confidence: 99%

Tomographic reconstruction of deformed internal structure of a field-reversed configuration

et al. 2006

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Visible bremsstrahlung tomographic diagnostic for the pulsed high density field-reversed configuration experiment Rev. Sci. Instrum. 77, 10F319 (2006); 10.1063/1.2220018Modeling of field-reversed configuration experiment with large safety factora) Phys. Plasmas 13, 056119 (2006); 10.1063/1.2177635 Rotating magnetic quadrupole current drive for field-reversed configurationsDeformation of the internal structure of a field-reversed configuration ͑FRC͒ was studied using a tomographic reconstruction technique. A simple and configurable tomographic system was developed, with which the time evolution of the FRC internal structure was reconstructed. In the latter phase of equilibrium, a FRC has a well-known global rotational instability with toroidal mode number n = 2. It has been believed that elliptical deformation of the FRC allows interaction between the wall and the plasma, which terminates this configuration. However, these experiments revealed the FRC to deform into a dumbbell-like structure before the edge hits the chamber wall, leading to the disruption phase. In addition, an internal shift ͑toroidal mode number n =1͒ mode was observed in the equilibrium phase, followed by growth of n = 2 rotational instability.

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“…The idea is just to form adequately long-lived FRC plasma and subsequently translate and compress the target plasma quickly enough so that the FRC could not gain enough angular momentum to develop catastrophic deformation. If an FRC is formed in 3 s, it is to be translated for 60 cm at Alfven velocity cm s and compressed at speed of cm s in radial direction, the stable time of the target FRC is desired to be around s. The extrapolation of existing FRC scaling laws indeed suggests that such stable time is possible in the interested density regime [13], [15], [16]. Our current record FRC stable time in FRX-L is 10.5 s after a major effort of improving the main field performance declared a success (shown in Section V).…”

Section: Evolution Of the High-density Frc Plasmamentioning

confidence: 98%

High-density field-reversed configuration plasma for magnetized target fusion

Zhang

Wurden

Intrator

et al. 2006

IEEE Trans. Plasma Sci.

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Field reversed theta pinch technology is employed with programmed cusp fields at the theta coil ends to form high-density field-reversed configuration (FRC) plasmas. The well-formed FRC plasmas have volume-averaged density of 2 4 10 22 m 3 , total temperature (T e + T i ) of 300-500 eV, and plasma lifetime between 10-20 s in 50-70 mtorr of deuterium static gas fill. The achieved FRC parameters are very close to the desired target plasma requirements for magnetized target fusion.

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The origin of the rotation in field-reversed configurations

Cited by 17 publications

References 19 publications

Field reversed configurations

Field reversed configurations

Tomographic reconstruction of deformed internal structure of a field-reversed configuration

High-density field-reversed configuration plasma for magnetized target fusion

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