MHD-stabilization of finite-β multiple-mirror plasmas

Tuszewski, M.; Price, D.; Lieberman, M. A.; Bravenec, R. V.; Doniger, K. J.; Hartman, C.W.; Lichtenberg, A. J.

doi:10.1088/0029-5515/19/9/009

“…This scaling has been verified experimentally [5,6]. Multiple-mirror plasmas have been stabilized by using average-minimum-B fields [8,9], and high-0 operation has been achieved [10]. A number of reactor feasibility design studies have been made [11 -14], including wetwood burner operation [11], the effects of impurities [11], high-|3 radial diffusion [12], and economic optimizations [13,14].…”

Section: Introductionmentioning

confidence: 92%

“…where boundary is given by sin 2 0LC = l/Rj. Evaluating the integral, (11) We can eliminate Gj between (10) and (11) and solve for nj. To account for the enhanced axial loss due to ambipolar effects, we must divide nj by 2.…”

Section: ~G} =F O (7)mentioning

confidence: 99%

A theoretical study of ICRF effects on multiple-mirror confinement

Doniger

¹

,

Lieberman

²

,

Lichtenberg

³

1985

Nucl. Fusion

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2

0

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The improvements in multi-mirror confinement due to an asymmetrically applied ion cyclotron resonance field (ICRF) are determined. The resonance field is used to selectively reflect ions that travel away from the centre of the device, thus creating a net ion drift towards the centre. The ICRF effects in heating and scattering the ions and modifying the loss cone geometry are determined in detail. A onedimensional, non-ignited (finite Q = fusion power/recirculating power) model of a multiple-mirror system is used to investigate confinement. Various scaling laws are numerically derived and compared to those of a symmetric system without ICRF. Radial diffusion due to classical collisions and ICRF effects is calculated. A 21-cell machine with a peak field of 280 kG and Q = 5 is reduced from 845 m to 580 m in length with the addition of the asymmetric ICRF. The total fusion power generated by the system is reduced from 8 to 6.3 GW.

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“…The relevant problem of MHD-instability, which is absent in the case of a dense plasma confined by walls, is believed to be solved through a complex magnetic system which suppresses the instability [17,18]. The pulsed version of the reactor with 0 < 1 is analysed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Phosphorescence and Thermoluminescence of UV-Irradiated SrO Powders at Temperatures from 120 K to 350 K

Yanagisawa¹,

Sakamoto²

1993

Jpn. J. Appl. Phys.

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The longitudinal confinement of a plasma in a pulsed multi-mirror fusion reactor is investigated. It is shown that the initial plasma energy W p per unit of reactor cross-section and the initial plasma temperature T o serve as similarity parameters. One-dimensional numerical calculations of plasma flow along the reactor axis were performed for various W p and T o and were used to determine the plasma gain function QE(W P , T o ). The region of maximum values of QE lies near T o = 5 keV for all W p . Plasma heating by a-particles becomes substantial for values of Q exceeding unity. At W p = 20 MJcm" 2 , QE calculated with plasma heating by a-particles exceeds QE as calculated without including such heating by a factor of five. If the mirror ratio is increased by enlarging the cross-section towards the reactor ends, Q is further increased by a factor of two. A value of QE = 1 is achieved at an initial plasma energy of W p « 5 MJ-cm" 2 , and QE = 10 is achieved for W p «12MJ-cm" 2 .

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“…The other concept, developed at the University of California, Berkeley (Refs [4,15,16]), deals with a stationary reactor with a plasma confined by a magnetic field (0 < 1) in the transverse direction. The relevant problem of MHD-instability, which is absent in the case of a dense plasma confined by walls, is believed to be solved through a complex magnetic system which suppresses the instability [17,18]. The pulsed version of the reactor with 0 < 1 is analysed in Ref.…”

Section: Introductionmentioning

confidence: 99%

A pulsed multi-mirror fusion reactor: longitudinal confinement

Knyazev¹,

Chebotaev²

1984

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The longitudinal confinement of a plasma in a pulsed multi-mirror fusion reactor is investigated. It is shown that the initial plasma energy W p per unit of reactor cross-section and the initial plasma temperature T o serve as similarity parameters. One-dimensional numerical calculations of plasma flow along the reactor axis were performed for various W p and T o and were used to determine the plasma gain function QE(W P , T o ). The region of maximum values of QE lies near T o = 5 keV for all W p . Plasma heating by a-particles becomes substantial for values of Q exceeding unity. At W p = 20 MJcm" 2 , QE calculated with plasma heating by a-particles exceeds QE as calculated without including such heating by a factor of five. If the mirror ratio is increased by enlarging the cross-section towards the reactor ends, Q is further increased by a factor of two. A value of QE = 1 is achieved at an initial plasma energy of W p « 5 MJ-cm" 2 , and QE = 10 is achieved for W p «12MJ-cm" 2 .

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MHD-stabilization of finite-β multiple-mirror plasmas

Cited by 12 publications

References 9 publications

A theoretical study of ICRF effects on multiple-mirror confinement

A theoretical study of ICRF effects on multiple-mirror confinement

Phosphorescence and Thermoluminescence of UV-Irradiated SrO Powders at Temperatures from 120 K to 350 K

A pulsed multi-mirror fusion reactor: longitudinal confinement

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