Vertical and Kink Mode Stability Calculations for Current Carrying Quasiaxial Stellarators

Redi, M. H.; Nührenberg, C.; Cooper, W. A.; Fu, G. Y.; Kessel, C.; Ku, L. P.; Monticello, D.; Reiman, A.; Zarnstorff, M. C.

doi:10.2172/8835

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…1. The inner target is moved outwards and tilted somewhat less with respect to the magnetic surfaces in order to accommodate a wider range of ITER plasma equilibria with flatter current profiles in the core (l i ≥ 0.6 vs. original 0.85, [2]). Furthermore, the reflector plates connected to the lower ends of the targets are rendered more horizontal in order to avoid direct plasma contact of their leading edges during possible excursions of the separatrix by placing them in the shadow of the reduced dome.…”

Section: Introductionmentioning

confidence: 99%

Analysis of performance of the optimized divertor in ITER

et al. 2009

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The paper describes the results of a physics analysis of a modified divertor cassette for ITER. The issues addressed are the impact on the operational window, the effect of gas leaks through the broader gaps between the divertor cassettes, and radiation power loading of different components of the cassettes. The radiation load on the side walls of the cassette structures in the inter-cassette gaps is identified as a design constraint not previously considered.

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Section: Introductionmentioning

confidence: 99%

Analysis of performance of the optimized divertor in ITER

et al. 2009

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“…More details on the kink and vertical stability calculations will be reported in [10]. The CAS3D code has also been used for benchmarking of kink and vertical stability calculations, and to extend kink and vertical stability calculations to the case with the wall at infinity [11,12].…”

Section: Ideal Mhd Stabilitymentioning

confidence: 99%

Physics design of a high-bbeta quasi-axisymmetric stellarator

Reiman

Hirshman

et al. 1999

Plasma Phys. Control. Fusion

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Key physics issues in the design of a high-β quasi-axisymmetric stellarator configuration are discussed. The goal of the design study is a compact stellarator configuration with aspect ratio comparable to that of tokamaks and good transport and stability properties. Quasiaxisymmetry has been used to provide good drift trajectories. Ballooning stabilization has been accomplished by strong axisymmetric shaping, yielding a stellarator configuration whose core is in the second stability regime for ballooning modes. A combination of externally generated shear and non-axisymmetric corrugation of the plasma boundary provides stability to external kink modes even in the absence of a conducting wall. The resulting configuration is also found to be robustly stable to vertical modes, increasing the freedom to perform axisymmetric shaping. Stability to neoclassical tearing modes is conferred by a monotonically increasing ι profile. A gyrokinetic δf code has been used to confirm the adequacy of the neoclassical confinement. Neutral beam losses have been evaluated with Monte Carlo codes.

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Robustness and Flexibility in NCSX: Global Ideal MHD Stability and Energetic Particle Transport

M.H.¹,

Diallo²,

Cooper³

et al. 1999

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Concerns about the flexibility and robustness of a compact quasiaxial stellarator design are addressed by studying the effects of varied pressure and iota profiles. For thirty related equilibrium configurations the global, ideal magnetohydrodynamic (MHD) stability is evaluated as well as energetic particle transport. It is found that tokamak intuition is useful to understanding the MHD stability, with pressure gradient driving terms and shear stabilization controlling both the N=0 and N=1 unstable modes. Global kink modes are generated by steeply peaked profiles and edge localized modes are found for plasmas with edge iota above 0.5. Energetic particle transport is not strongly dependent on these changes of pressure and iota profiles, although a weak inverse dependence on pressure peaking through the magnetic axis Shafranov shift is found. While good transport and MHD stability are not anticorrelated in these 30 equilibria, stability depends on a delicate balance of the pressure and shear stabilization forces.

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Vertical and Kink Mode Stability Calculations for Current Carrying Quasiaxial Stellarators

Cited by 4 publications

References 3 publications

Analysis of performance of the optimized divertor in ITER

Analysis of performance of the optimized divertor in ITER

Physics design of a high-bbeta quasi-axisymmetric stellarator

Robustness and Flexibility in NCSX: Global Ideal MHD Stability and Energetic Particle Transport

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