Crossed-field plasma discharges at low pressures

Pankrat'ev, Yu. I.; Naboka, V. A.; Ponomarenko, E. F.; Lavrent'ev, O.A.

doi:10.1088/0029-5515/12/3/018

Cited by 7 publications

(9 citation statements)

References 3 publications

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“…In the two-dimensional case a component of electric field is perpendicular to the magnetic field. The large E X B drifts could result in the diochotron instability [117] which has indeed been found experimentally [116], setting in at a frequency cop e /£2 e , which correctly varied inversely with magnetic field. The degree of electrostatic trapping in this experiment is not stated.…”

Section: Electrostatic Plugging Of Endssupporting

confidence: 54%

“…A scheme proposed by Lavrentev [112] has electrodes arranged so that an electric field parallel to B reflects ions back into the magnetic trap, and further out along the lines of force another electric field of opposite sign reflects the electrons. Some elementary theoretical considerations have been undertaken by Ware and Faulkner [113] and others [114,115] and an experiment has been carried out by Pankratev et al [116]. Figure 34 illustrates the basic experimental proposal [115].…”

Section: Electrostatic Plugging Of Endsmentioning

confidence: 99%

“…8.9 x 10 gauss . cm (116) where, again m = 10 15 , T = 1.39 X 10 8 K, and pressure balance [Eq. ( 6)] have been used.…”

Section: Electrostatic Plugging Of Endsmentioning

confidence: 99%

“…( 123) applies, and so there is a change of slope. The condition on wall loading for this diffusion regime can be obtained by eliminating B from Eqs (116) In the diffusion region lines of constant B are also lines of constant energy output E; in fact Eqs ( 119) and ( 123) can be combined to give E = 8.9 x 10…”

Section: Electrostatic Plugging Of Endsmentioning

confidence: 99%

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Plasma containment in cusp-shaped magnetic fields

Haines

1977

Nucl. Fusion

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Advances in the subject of plasma containment in cusp-shaped magnetic fields over the past six or more years are reviewed. Particular emphasis is placed on the structure and thickness of the sheath separating a field-free plasma from a vacuum magnetic field. Recent experimental results suggest possibly that the thickness could be the geometric mean of the electron and ion Larmor radii, compared to earlier results in which the thickness measured was nearer the ion Larmor radius. The electric field in the sheath is important not only in determining its structure but also in problems associated with flow, end shorting, losses, and plasma rotation and stability. The present status of radio-frequency and electrostatic plugging of the ends is presented. Liner implosion to obtain extreme, and perhaps optimal, conditions for controlled fusion is a new aspect of this subject which deserves some attention. Hybrid schemes which employ cuspshaped magnetic fields as an essential part of their containment configuration include the linear picket fence, the spherical multipole magnetic trap, the stuffed cusp, the caulked stuffed cusp, the caulked cusp torus (CCT), the toroidal line cusp (or Tormac), and the containment of a flowing plasma in toroidal multiple cusps (the Polytron). These are reviewed, and their advantages and disadvantages for fusion are discussed.

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Section: Electrostatic Plugging Of Endssupporting

confidence: 54%

Section: Electrostatic Plugging Of Endsmentioning

confidence: 99%

“…8.9 x 10 gauss . cm (116) where, again m = 10 15 , T = 1.39 X 10 8 K, and pressure balance [Eq. ( 6)] have been used.…”

Section: Electrostatic Plugging Of Endsmentioning

confidence: 99%

Section: Electrostatic Plugging Of Endsmentioning

confidence: 99%

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Plasma containment in cusp-shaped magnetic fields

Haines

1977

Nucl. Fusion

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“…The magnetic flux surfaces passing one electron Larmor radius from the midplane of the ring cusp are taken as the boundary between these two regions. With these assumptions, the electron diffusion loss rate is found to be (6) where dS is an element of surface area, D.L is the perpendicular diffusion coefficient;~is a coordinate perpendicular to the magnetic flux surfaces; dV is a differential volume element; R is a characteristic radius, taken to be the ring cusp (7) This "confinement time" will be compared with experimentally measured plasma decay times. Data from two electromagnetic trap experiments are shown in TABLE I.…”

Section: Diffusion Loss Ratementioning

confidence: 99%