Physics design of a high-β quasi-axisymmetric stellarator

A. Reiman; G. Fu; S. Hirshman; L. Ku; D. Monticello; H. Mynick; M. Redi; D. Spong; M. Zarnstorff; B. Blackwell; A. Boozer; A. Brooks; W. A. Cooper; M. Drevlak; R. Goldston; J. Harris; M. Isaev; C. Kessel; Z. Lin; J. F. Lyon; P. Merkel; M. Mikhailov; W. Miner; N. Nakajima; G. Neilson; C. Nührenberg; M. Okamoto; N. Pomphrey; W. Reiersen; R. Sanchez; J. Schmidt; A. Subbotin; P. Valanju; K. Y. Watanabe; R. White

doi:10.1088/0741-3335/41/12B/320

Physics design of a high-β quasi-axisymmetric stellarator

A. Reiman^*, G. Fu, S. Hirshman, L. Ku, D. Monticello, H. Mynick, M. Redi, D. Spong, M. Zarnstorff, B. Blackwell, A. Boozer, A. Brooks, W. A. Cooper, M. Drevlak, R. Goldston, J. Harris, M. Isaev, C. Kessel, Z. Lin, J. F. LyonP. Merkel, M. Mikhailov, W. Miner, N. Nakajima, G. Neilson, C. Nührenberg, M. Okamoto, N. Pomphrey, W. Reiersen, R. Sanchez, J. Schmidt, A. Subbotin, P. Valanju, K. Y. Watanabe, R. White

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

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. Quasi-axisymmetry 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.

Original language	English
Pages (from-to)	B273-B283
Journal	Plasma Physics and Controlled Fusion
Volume	41
Issue number	SUPPL. 12B
DOIs	https://doi.org/10.1088/0741-3335/41/12B/320
Publication status	Published - 1999

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Reiman, A., Fu, G., Hirshman, S., Ku, L., Monticello, D., Mynick, H., Redi, M., Spong, D., Zarnstorff, M., Blackwell, B., Boozer, A., Brooks, A., Cooper, W. A., Drevlak, M., Goldston, R., Harris, J., Isaev, M., Kessel, C., Lin, Z., ... White, R. (1999). Physics design of a high-β quasi-axisymmetric stellarator. Plasma Physics and Controlled Fusion, 41(SUPPL. 12B), B273-B283. https://doi.org/10.1088/0741-3335/41/12B/320

@article{82d4d0ee23794102a947f3afc34c3b4f,

title = "Physics design of a high-β quasi-axisymmetric stellarator",

abstract = "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. Quasi-axisymmetry 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.",

author = "A. Reiman and G. Fu and S. Hirshman and L. Ku and D. Monticello and H. Mynick and M. Redi and D. Spong and M. Zarnstorff and B. Blackwell and A. Boozer and A. Brooks and Cooper, {W. A.} and M. Drevlak and R. Goldston and J. Harris and M. Isaev and C. Kessel and Z. Lin and Lyon, {J. F.} and P. Merkel and M. Mikhailov and W. Miner and N. Nakajima and G. Neilson and C. N{\"u}hrenberg and M. Okamoto and N. Pomphrey and W. Reiersen and R. Sanchez and J. Schmidt and A. Subbotin and P. Valanju and Watanabe, {K. Y.} and R. White",

year = "1999",

doi = "10.1088/0741-3335/41/12B/320",

language = "English",

volume = "41",

pages = "B273--B283",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

number = "SUPPL. 12B",

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Reiman, A, Fu, G, Hirshman, S, Ku, L, Monticello, D, Mynick, H, Redi, M, Spong, D, Zarnstorff, M, Blackwell, B, Boozer, A, Brooks, A, Cooper, WA, Drevlak, M, Goldston, R, Harris, J, Isaev, M, Kessel, C, Lin, Z, Lyon, JF, Merkel, P, Mikhailov, M, Miner, W, Nakajima, N, Neilson, G, Nührenberg, C, Okamoto, M, Pomphrey, N, Reiersen, W, Sanchez, R, Schmidt, J, Subbotin, A, Valanju, P, Watanabe, KY & White, R 1999, 'Physics design of a high-β quasi-axisymmetric stellarator', Plasma Physics and Controlled Fusion, vol. 41, no. SUPPL. 12B, pp. B273-B283. https://doi.org/10.1088/0741-3335/41/12B/320

TY - JOUR

T1 - Physics design of a high-β quasi-axisymmetric stellarator

AU - Reiman, A.

AU - Fu, G.

AU - Hirshman, S.

AU - Ku, L.

AU - Monticello, D.

AU - Mynick, H.

AU - Redi, M.

AU - Spong, D.

AU - Zarnstorff, M.

AU - Blackwell, B.

AU - Boozer, A.

AU - Brooks, A.

AU - Cooper, W. A.

AU - Drevlak, M.

AU - Goldston, R.

AU - Harris, J.

AU - Isaev, M.

AU - Kessel, C.

AU - Lin, Z.

AU - Lyon, J. F.

AU - Merkel, P.

AU - Mikhailov, M.

AU - Miner, W.

AU - Nakajima, N.

AU - Neilson, G.

AU - Nührenberg, C.

AU - Okamoto, M.

AU - Pomphrey, N.

AU - Reiersen, W.

AU - Sanchez, R.

AU - Schmidt, J.

AU - Subbotin, A.

AU - Valanju, P.

AU - Watanabe, K. Y.

AU - White, R.

PY - 1999

Y1 - 1999

N2 - 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. Quasi-axisymmetry 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.

AB - 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. Quasi-axisymmetry 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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U2 - 10.1088/0741-3335/41/12B/320

DO - 10.1088/0741-3335/41/12B/320

M3 - Article

SN - 0741-3335

VL - 41

SP - B273-B283

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - SUPPL. 12B

ER -

Physics design of a high-β quasi-axisymmetric stellarator

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