Roles of aspect ratio, absolute B and effective Z of the H-mode power threshold in tokamaks of the ITPA database

T. Takizuka; J. A. Snipes; M. Greenwald; F. Ryter; O. J.W.F. Kardaun; J. Stober; M. Valovic; T. N. Carlstrom; J. C. DeBoo; Y. Andrew; J. G. Cordey; R. Sartori; K. Thomsen; Y. Miura; T. Fukuda; Y. Kamada; K. Shinohara; K. Tsuzuki; S. M. Kaye; C. Bush; R. Maingi; Y. Martin; S. Lebedev

doi:10.1088/0741-3335/46/5A/024

Roles of aspect ratio, absolute B and effective Z of the H-mode power threshold in tokamaks of the ITPA database

T. Takizuka
, J. A. Snipes
, M. Greenwald
, F. Ryter
, O. J.W.F. Kardaun
, J. Stober
, M. Valovic
, T. N. Carlstrom
, J. C. DeBoo
, Y. Andrew
, J. G. Cordey
, R. Sartori
, K. Thomsen
, Y. Miura
, T. Fukuda
, Y. Kamada
, K. Shinohara
, K. Tsuzuki
, S. M. Kaye
, C. Bush

R. Maingi, Y. Martin, S. Lebedev

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

76 Scopus citations

Abstract

An analysis of the international tokamak physics activity (ITPA) H-mode power threshold database is advanced to study the roles of the aspect ratio, A, the absolute magnetic field and the effective charge number, Z_eff. A new scaling expression for the power threshold, P_thr, is presented. The absolute B at the outer surface is used instead of B_t in the scaling, and the I_p dependence of P_thr in low-A tokamaks is described without the explicit use of the I_P variable. A clear and strong dependence on Z_eff is found; P_thr ∝ Z _eff^0.7. Both the scattering nature in the data fitting and the 'low-density anomaly' can be reduced. A nonlinear A dependence is also suggested. The P_thr in ITER is predicted on the basis of the present scaling.

Original language	English (US)
Pages (from-to)	A227-A233
Journal	Plasma Physics and Controlled Fusion
Volume	46
Issue number	5 SUPPL. A
DOIs	https://doi.org/10.1088/0741-3335/46/5A/024
State	Published - May 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/46/5A/024

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Takizuka, T., Snipes, J. A., Greenwald, M., Ryter, F., Kardaun, O. J. W. F., Stober, J., Valovic, M., Carlstrom, T. N., DeBoo, J. C., Andrew, Y., Cordey, J. G., Sartori, R., Thomsen, K., Miura, Y., Fukuda, T., Kamada, Y., Shinohara, K., Tsuzuki, K., Kaye, S. M., ... Lebedev, S. (2004). Roles of aspect ratio, absolute B and effective Z of the H-mode power threshold in tokamaks of the ITPA database. Plasma Physics and Controlled Fusion, 46(5 SUPPL. A), A227-A233. https://doi.org/10.1088/0741-3335/46/5A/024

@article{af8f6a8487964461bdbc7be87c3a2808,

title = "Roles of aspect ratio, absolute B and effective Z of the H-mode power threshold in tokamaks of the ITPA database",

abstract = "An analysis of the international tokamak physics activity (ITPA) H-mode power threshold database is advanced to study the roles of the aspect ratio, A, the absolute magnetic field and the effective charge number, Zeff. A new scaling expression for the power threshold, Pthr, is presented. The absolute B at the outer surface is used instead of Bt in the scaling, and the Ip dependence of Pthr in low-A tokamaks is described without the explicit use of the IP variable. A clear and strong dependence on Zeff is found; Pthr ∝ Z eff0.7. Both the scattering nature in the data fitting and the 'low-density anomaly' can be reduced. A nonlinear A dependence is also suggested. The Pthr in ITER is predicted on the basis of the present scaling.",

author = "T. Takizuka and Snipes, \{J. A.\} and M. Greenwald and F. Ryter and Kardaun, \{O. J.W.F.\} and J. Stober and M. Valovic and Carlstrom, \{T. N.\} and DeBoo, \{J. C.\} and Y. Andrew and Cordey, \{J. G.\} and R. Sartori and K. Thomsen and Y. Miura and T. Fukuda and Y. Kamada and K. Shinohara and K. Tsuzuki and Kaye, \{S. M.\} and C. Bush and R. Maingi and Y. Martin and S. Lebedev",

year = "2004",

month = may,

doi = "10.1088/0741-3335/46/5A/024",

language = "English (US)",

volume = "46",

pages = "A227--A233",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

number = "5 SUPPL. A",

}

Takizuka, T, Snipes, JA, Greenwald, M, Ryter, F, Kardaun, OJWF, Stober, J, Valovic, M, Carlstrom, TN, DeBoo, JC, Andrew, Y, Cordey, JG, Sartori, R, Thomsen, K, Miura, Y, Fukuda, T, Kamada, Y, Shinohara, K, Tsuzuki, K, Kaye, SM, Bush, C, Maingi, R, Martin, Y & Lebedev, S 2004, 'Roles of aspect ratio, absolute B and effective Z of the H-mode power threshold in tokamaks of the ITPA database', Plasma Physics and Controlled Fusion, vol. 46, no. 5 SUPPL. A, pp. A227-A233. https://doi.org/10.1088/0741-3335/46/5A/024

TY - JOUR

T1 - Roles of aspect ratio, absolute B and effective Z of the H-mode power threshold in tokamaks of the ITPA database

AU - Takizuka, T.

AU - Snipes, J. A.

AU - Greenwald, M.

AU - Ryter, F.

AU - Kardaun, O. J.W.F.

AU - Stober, J.

AU - Valovic, M.

AU - Carlstrom, T. N.

AU - DeBoo, J. C.

AU - Andrew, Y.

AU - Cordey, J. G.

AU - Sartori, R.

AU - Thomsen, K.

AU - Miura, Y.

AU - Fukuda, T.

AU - Kamada, Y.

AU - Shinohara, K.

AU - Tsuzuki, K.

AU - Kaye, S. M.

AU - Bush, C.

AU - Maingi, R.

AU - Martin, Y.

AU - Lebedev, S.

PY - 2004/5

Y1 - 2004/5

N2 - An analysis of the international tokamak physics activity (ITPA) H-mode power threshold database is advanced to study the roles of the aspect ratio, A, the absolute magnetic field and the effective charge number, Zeff. A new scaling expression for the power threshold, Pthr, is presented. The absolute B at the outer surface is used instead of Bt in the scaling, and the Ip dependence of Pthr in low-A tokamaks is described without the explicit use of the IP variable. A clear and strong dependence on Zeff is found; Pthr ∝ Z eff0.7. Both the scattering nature in the data fitting and the 'low-density anomaly' can be reduced. A nonlinear A dependence is also suggested. The Pthr in ITER is predicted on the basis of the present scaling.

AB - An analysis of the international tokamak physics activity (ITPA) H-mode power threshold database is advanced to study the roles of the aspect ratio, A, the absolute magnetic field and the effective charge number, Zeff. A new scaling expression for the power threshold, Pthr, is presented. The absolute B at the outer surface is used instead of Bt in the scaling, and the Ip dependence of Pthr in low-A tokamaks is described without the explicit use of the IP variable. A clear and strong dependence on Zeff is found; Pthr ∝ Z eff0.7. Both the scattering nature in the data fitting and the 'low-density anomaly' can be reduced. A nonlinear A dependence is also suggested. The Pthr in ITER is predicted on the basis of the present scaling.

UR - https://www.scopus.com/pages/publications/2942560980

UR - https://www.scopus.com/pages/publications/2942560980#tab=citedBy

U2 - 10.1088/0741-3335/46/5A/024

DO - 10.1088/0741-3335/46/5A/024

M3 - Article

AN - SCOPUS:2942560980

SN - 0741-3335

VL - 46

SP - A227-A233

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 5 SUPPL. A

ER -

Roles of aspect ratio, absolute B and effective Z of the H-mode power threshold in tokamaks of the ITPA database

Abstract

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