Initial TMX-U thermal-barrier experiments

Simonen, T.C.; Allen, S.L.; Berzins, L.V.; Carter, M.; Casper, T.A.; Clauser, John F.; Clower, C. A.; Coensgen, F.H.; Correll, D.L.; Cummins, W.F.

doi:10.2172/5649933

Cited by 6 publications

(13 citation statements)

References 8 publications

(8 reference statements)

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“…Slow FRC formation may be possible by using neutral beams. This FRM approach came close to success a decade ago [15], and later studies [14, 63-65, 174, 172] suggest that it may be worth further consideration. High energy particles from neutral beams could help to achieve stable FRCs with large values of s by maintaining strong kinetic effects.…”

Section: Discussionmentioning

confidence: 99%

“…In the 2XIIB experiments sketched in Fig. 12, off-axis neutral beams drove ion currents in a mirror-confined plasma target in order to form and sustain an FRM [15]. Field reversal was probably not achieved, for reasons that remain unclear.…”

Section: Slow Frc Formationmentioning

confidence: 99%

“…When the presence of the FRC and of the coil are taken into account, the separatrix multipole field is approximately doubled [22,313]. Equation (15) indicates that stability is achieved when the average multipole field pressure at the separatrix equals the centrifugal pressure of the rotating plasma. This result looks quite robust, but it is more pessimistic than experimental observations: Eq.…”

Section: Fig 30 End-on Frc Holograms Illustrating Multipole Stabilimentioning

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: Discussionmentioning

confidence: 99%

Section: Slow Frc Formationmentioning

confidence: 99%

Section: Fig 30 End-on Frc Holograms Illustrating Multipole Stabilimentioning

confidence: 99%

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Field reversed configurations

1988

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“…A detailed explanation of the operation of this machine is outside the scope of the present discussion and is presented elsewhere [3,4]. For reference, a schematic of the magnetic field profile is shown in Fig.…”

Section: Particle Source Measurements With Video Datamentioning

confidence: 99%

Optical Imaging Diagnostics for Fusion Plasmas

Allen

1988

MRS Proc.

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Imaging diagnostics are used for spatially-and temporally-resolved quantitative measurements of plasma properties such as the ionization particle source, particle and energy loss, and impurity radiation in magnetically confined fusion plasmas. Diagnostics equipped with multi-element solid-state detectors (often with image intensifiers) are well suited to the environment of large fusion machines with high magnetic fields and x-ray and neutron fluxes. We have used both conventional (16 ms/frame) and highspeed video cameras to measure neutral deuterium Hα, (6563 Å) emissions from fusion plasmas. Continuous high-speed measurements are made with video cameras operating at 0.1–0.5 ms/frame; gated cameras provide snapshots of 10–100 μs during each 16-ms video frame. Digital data acquisition and absolute intensity calibrations of the cameras enable detailed quantitative source measurements; these are extremely important in determining the particle balance of the plasma. In a linear confinement device, radial transport can be determined from the total particle balance. In a toroidal confinement device, the details of particle recycling can be determined. Optical imaging in other regions of the spectrum are also important, particularly for the divertor region of large tokamaks. Absolutely calibrated infrared cameras have been used to image the temperature changes in the walls and thereby determine the heat flux. Absolutely calibrated imaging ultraviolet spectrometers measure impurity concentrations; both spatial and spectral imaging instruments are employed. Representative data from each of these diagnostic systems will be presented.

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“…In the area of nuclear fusion, it has been proposed that the electrostatic potential is created along a magnetic field line positively to improve the confinement of plasmas along magnetic field lines in an open-ended magnetic confinement device, [1][2][3][4][5] which is called a ''tandem mirror.'' The subsequent experimental efforts at demonstrating the electrostatic potential formation along a magnetic field line have revealed that the electrostatic potential in the end-mirror cells in a tandem mirror is created by a different mechanism from the theoretical concept.…”

Section: Introductionmentioning

confidence: 99%

Collision effects on the saturated electrostatic potential along a magnetic field line

et al. 2003

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The Coulomb collision effects on a saturated electrostatic potential ͑plug potential͒ formation in the end-mirror cell of a tandem mirror were investigated by a Monte Carlo simulation of ion orbits. A non-Maxwellian electron distribution function, which leads to a modified Boltzmann law, is assumed to obtain the electrostatic potential. An ion velocity distribution is determined by the Monte Carlo simulation of ions. It was found that a saturated electrostatic potential is formed in a wide range of the Coulomb collisionality. Especially, fewer Coulomb collisions were found to create a higher saturated electrostatic potential along a magnetic field, although the Coulomb collisions are necessary for a saturated electrostatic potential formation.

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Initial TMX-U thermal-barrier experiments

Cited by 6 publications

References 8 publications

Field reversed configurations

Field reversed configurations

Optical Imaging Diagnostics for Fusion Plasmas

Collision effects on the saturated electrostatic potential along a magnetic field line

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