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. BushR. Maingi, Y. Martin, S. Lebedev

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

75 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

Access to Document

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

Cite this

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/inward/citedby.url?scp=2942560980&partnerID=8YFLogxK

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

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this