Recent progress in the ARIES compact stellarator study

Najmabadi, F.; Raffray, A.R.

doi:10.1016/j.fusengdes.2006.07.087

Cited by 12 publications

(9 citation statements)

References 23 publications

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“…For a given set of density and temperature profiles the fusion power scales as B 4 β 2 R 3 p /A 2 p . Using the same form factors as those used in ARIES-CS [14] which is a power plant for the low aspect ratio, quasi-axisymmetric stellarators, the conditions used for the hypothetical reactor give a thermal power of about 1200 MW in a steady state.…”

Section: Transport and Confinement Propertiesmentioning

confidence: 99%

New classes of quasi-helically symmetric stellarators

Boozer

2010

Nucl. Fusion

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New classes of quasi-helically symmetric stellarators with aspect ratios ≤ 10 have been found which are stable to the perturbation of magnetohydrodynamic modes at plasma pressures of practical interest. These configurations have large rotational transform and good quality of flux surfaces. Characteristics of some selected examples are discussed in detail. The feasibility of using modular coils for these stellarators has been investigated. It is shown that practical designs for modular coils can be achieved.

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Section: Transport and Confinement Propertiesmentioning

confidence: 99%

New classes of quasi-helically symmetric stellarators

Boozer

2010

Nucl. Fusion

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“…Non-planar configurations can be found in force-balanced (helical) coils for magnetic energy storage (Miura, Sakota & Shimada 1994), particle accelerator magnets using saddle/bedstead (Thomas, Faircloth & Jago 2005) or canted cosine theta (Amemiya et al. 2015) geometries and the stellarator concept of a magnetic fusion energy system (Najmabadi & Raffray 2006; Wolf 2008).…”

Section: Introductionmentioning

confidence: 99%

“…While worldwide focus has been largely directed towards high-field planar magnet systems, little attention has been paid to new opportunities enabled by HTS technology in applications that benefit from improved non-planar magnets. Non-planar configurations can be found in force-balanced (helical) coils for magnetic energy storage (Miura, Sakota & Shimada 1994), particle accelerator magnets using saddle/bedstead (Thomas, Faircloth & Jago 2005) or canted cosine theta (Amemiya et al 2015) geometries and the stellarator concept of a magnetic fusion energy system (Najmabadi & Raffray 2006;Wolf 2008).…”

Section: Introductionmentioning

confidence: 99%

Non-planar coil winding angle optimization for compatibility with non-insulated high-temperature superconducting magnets

Paz-Soldan

2020

J. Plasma Phys.

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The rapidly emerging technology of high-temperature superconductors (HTS) opens new opportunities for the development of non-planar non-insulated HTS magnets. This type of HTS magnet offers attractive features via its simplicity and robustness, and is well suited for modest size steady-state applications such as a mid-scale stellarator. In non-planar coil applications the HTS tape may be subject to severe hard-way bending strain ( $\epsilon _{\textrm {bend}}$ ), torsional strains ( $\epsilon _{\textrm {tor}}$ ) and magnetic field components transverse to the HTS tape plane ( $B_{\perp }$ ), all of which can limit the magnet operating space. A novel method of winding angle optimization is here presented to overcome these limitations for fixed input non-planar coil filamentary geometry. Essentially, this method: (i) calculates the peak $\epsilon _{\textrm {bend}}$ and $B_{\perp }$ for arbitrary winding angle along an input coil filamentary trajectory, (ii) defines a cost function including both and then (iii) uses tensioned splines to define a winding angle that reduces $\epsilon _{\textrm {tor}}$ and optimizes the $\epsilon _{\textrm {bend}}$ and $B_{\perp }$ cost function. As strain limits are present even without $B_{\perp }$ , this optimization is able to provide an assessment of the minimum buildable size of an arbitrary non-planar non-insulating HTS coil. This optimization finds that for standard 4 mm wide HTS tapes the minimum size coils of the existing HSX, NCSX and W7-X stellarator geometries are around 0.3–0.5 m in mean coil radius. Identifying the minimum size provides a path to specify a mid-scale stellarator capable of achieving high-field or high-temperature operation with minimal HTS tape length. For coils larger than this size, strain optimization allows use of wider (higher current capacity) HTS tapes or alternatively permitting a finite (yet tolerable) strain allows reduction of $B_{\perp }$ . Reduced $B_{\perp }$ enables a reduction of the HTS tape length required to achieve a given design magnetic field or equivalently an increase in the achievable magnetic field for fixed HTS tape length. The distinct considerations for optimizing a stellarator coilset to further ease compatibility with non-insulated HTS magnets are also discussed, highlighting relaxed curvature limits and the introduction of limits to the allowable torsion.

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“…ARIES explores a wide range of parameters for designing viable operating plasmas for high fusion performance tokamaks [1]. In ARIES designs, the fusion product α particles are assumed abundant and their confinement is crucial for the success of the design.…”

Section: Introductionmentioning

confidence: 99%

1.5D Quasilinear Model for Alpha Particle-TAE Interaction in ARIES ACT-I

Ghantous¹,

Gorelenkov²,

Kessel³

et al. 2013

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We study the TAE interaction with alpha particle fusion products in ARIES ACT-I using the 1.5D quasilinear model. 1.5D uses linear analytic expressions for growth and damping rates of TAE modes evaluated using TRANSP profiles to calculates the relaxation of α pressure profiles. NOVA-K simulations are conducted to validate the analytic dependancies of the rates, and to normalize their absolute value. The low dimensionality of the model permits calculating loss diagrams in large parameter spaces.

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Recent progress in the ARIES compact stellarator study

Cited by 12 publications

References 23 publications

New classes of quasi-helically symmetric stellarators

New classes of quasi-helically symmetric stellarators

Non-planar coil winding angle optimization for compatibility with non-insulated high-temperature superconducting magnets

1.5D Quasilinear Model for Alpha Particle-TAE Interaction in ARIES ACT-I

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