Features of spherical torus plasmas

Peng, Y. K. M.; Strickler, D. J.

doi:10.2172/6155386

Cited by 24 publications

(25 citation statements)

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“…7, but with the parameters systematically changed. Figure 8 shows how the time at which it takes the plasma current to reach 99% of it's final value depends on the current turnon time t 1 . For the inductive case 7(a), this time is the same as the turnon time, whereas for all the non-inductive currentdrive cases it is significantly longer.…”

Section: A Simple Illustration In 1dmentioning

confidence: 99%

“…There is considerable interest in using non-inductive current drive to establish, maintain, control, and modify the current distribution in lowaspect-ratio toroidal fusion experiments, often called spherical tori, spherical tokamaks, or STs [1]. This interest stems from the fundamental geometry of a low-aspect-ratio torus, which precludes the presence of a large internal solenoid or "OH" coil.…”

Section: Introductionmentioning

confidence: 99%

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Time-Scales for Non-Inductive Current Buildup in Low-Aspect-Ratio Toroidal Geometry

Jardin¹

1999

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The fundamental differences between inductive and non-inductive current buildup are clarified and the associated time-scales and other implications are discussed. A simulation is presented whereby the plasma current in a low-aspect-ratio torus is increased primarily by the self-generated bootstrap current with only 10% coming from external current drive. The maximum obtainable plasma current by this process is shown to scale with the toroidal field strength. The basic physics setting the time-scales can be obtained from a 1D analysis. Comparisons are made between the timescales found here and those reported in the experimental literature.2

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Section: A Simple Illustration In 1dmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time-Scales for Non-Inductive Current Buildup in Low-Aspect-Ratio Toroidal Geometry

Jardin¹

1999

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“…Additional unique physics properties of this concept were described by Peng and Strickler [3], who coined the term 'spherical torus', or ST. These physics features included such desirable features as large natural elongation, strong magnetic helical pitch, and the existence of a large near-omnigeneous region in the plasma cross section which suggests improved confinement.…”

Section: Introductionmentioning

confidence: 98%

Physics basis for a spherical torus power plant

Jardin

Kessel

Ménard

et al. 2003

Fusion Engineering and Design

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The spherical torus, or low-aspect-ratio tokamak, is considered as the basis for a fusion power plant. A special class of wall-stabilized high-b high-bootstrap fraction low-aspect-ratio tokamak equilibrium are analyzed with respect to MHD stability, bootstrap current and external current drive, poloidal field system requirements, power and particle exhaust and plasma operating regime. Overall systems optimization leads to a choice of aspect ratio A0/1.6, plasma elongation k 0/3.4, and triangularity d0/0.64. The design value for the plasma toroidal b is 50%, corresponding to b N 0/7.4, (based on the toroidal b , not the total b ) which is 10% below the ideal stability limit. The bootstrap fraction of 99% greatly alleviates the current drive requirements, with tangential neutral beam injection mainly for profile control and rotation drive. The design is such that 45% of the thermal power is radiated in the plasma by Bremstrahlung and trace Krypton, with Neon in the scrapeoff layer radiating the remainder. The scarcity of spherical torus experimental data caused the design to be based largely on theoretical predictions, some of which may turn out to be overly optimistic. This highlights the need for a strong experimental research program in this area. #

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“…Since the mid -1980s the spherical tokamak (ST) has been recognized as an important device for fusion research [1][2][3][4]. Such devices demonstrate all the main features of high aspect ratio tokamaks but are relatively small and inexpensive to construct.…”

Section: Introductionmentioning

confidence: 99%