Research program for plasma confinement and heating in ELMO bumpy torus devices

Dandl, R.A.; Dory, R.A.; Eason, H.O.

doi:10.2172/4199922

Cited by 12 publications

(23 citation statements)

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“…Similar internally peaked profiles are observed in stellarators in the internal transport barrier (ITB) regimes, see numerous experiments performed on LHD [35,36], and ELMO bumpy torus high-beta hot ECRH-electron experiments [37,38].…”

Section: Closed Multiple-mirror Systemssupporting

confidence: 60%

Internal plasma pressure peaking in low-shear open and closed magnetic confinement systems

Tsventoukh¹

2011

Nucl. Fusion

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The plasma convective (flute-interchange) stability for low magnetic shear systems, with a low collisionality and a low beta, is considered in terms of the necessary and sufficient collisionless kinetic criterion. The magnetic confinement systems under consideration are axially symmetric mirrors equipped with outer divertors and inner field reversing rings (cusps, internal rings, high-beta cells) and closed multimirror traps. A simple approach is proposed for plasma stabilization resulting in a substantial steepening of the critical pressure profile. The essence is the combination of the plasma stabilization by a strong and an alternating-sign field-line curvature. Axially symmetric tandem mirror systems composed of a mirror device having an outer divertor and an inner field reversing ring are shown to have an internal radially peaked stable pressure profile. Bumpy tori are also shown to have an internally peaked stable pressure profile.

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Section: Closed Multiple-mirror Systemssupporting

confidence: 60%

Internal plasma pressure peaking in low-shear open and closed magnetic confinement systems

Tsventoukh¹

2011

Nucl. Fusion

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“…Experiments have been perfdrmed on the EBT-I, which is a steady-state toroidal confinement device consisting of 24 canted mirror sections with an axial magnetic field B o of 5 kG at the midplane [ 1 ]. The NUCLEAR FUSION, Vol.24, No.9 (1984) plasma is produced and heated by microwaves that are applied at the electron cyclotron harmonic frequencies.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Plasma fluctuations in the Elmo Bumpy Torus (EBT) have long been a subject of theoretical and experimental investigation [1][2][3][4][5][6][7][8]. In the bumpy torus confinement geometry, a toroidal equilibrium is established by the poloidal drifts that result from the radial mirror field gradient.…”

Section: Introductionmentioning

confidence: 99%

Observations of low-frequency plasma fluctuations in the Elmo Bumpy Torus

Komori

1984

Nucl. Fusion

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Fluctuations in the DC frequency range up to 400 kHz are studied in the Elmo Bumpy Torus (EBT-I) plasma. Special attention is paid to the effect of microwave-heated hot-electron rings on the fluctuations, and the fluctuations of the toroidal plasma around the hot-electron rings are found to be reduced to a low level. This reduction is also related to changes in the density gradient, and the predictions of a density-gradient-driven drift wave theory are examined. In the surface plasma surrounding the toroidal plasma, two types of fluctuations are observed: fluctuations with properties similar to those of the densitygradient-driven drift wave and electromagnetic fluctuations localized in the outer plasma along the hotelectron rings.

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“…In steady state the annulus power balance is where PTA is the thermal conduction and convection, ' B A is bremsstrahlung losses, PCA is synchrotron (cyclotron) radiation, and P is the microwave I-IA power required to sustain the annulus. The emission of synchrotron radiation from the hot electron annulus $n EBT and in a large-scale EBTR was estimated in the initial EBT proposal [1,2]. More detailed calculations have been carried out for the EBTR reference design and reported in Ref.…”

Section: Maintaining Steady Statementioning

confidence: 99%

“…As is done in Refs [2,5], the electron annulus is energetically separated from the toroidal plasma and power transfer between the electron r i n g and t h e t o r o i d a l plasma i s included i n t:he synchrotron r a d i a t i o n term (PC) which has a very s m a l l e f f e c t on t h e power balance. and Eqs (2.1)-(2.7), reference parameters in Table I are obtained. Although details of Model A have been.discussed in Ref.…”

Section: Maintaining Steady Statementioning

confidence: 99%

Plasma simulation and modeling for ELMO bumpy torus reactor

Uckan¹,

Hedrick²

1977

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Research program for plasma confinement and heating in ELMO bumpy torus devices

Cited by 12 publications

References 0 publications

Internal plasma pressure peaking in low-shear open and closed magnetic confinement systems

Internal plasma pressure peaking in low-shear open and closed magnetic confinement systems

Observations of low-frequency plasma fluctuations in the Elmo Bumpy Torus

Plasma simulation and modeling for ELMO bumpy torus reactor

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