Study of high poloidal beta plasmas in TFTR and DIII-D

G. A. Navratil; R. A. Gross; M. E. Mauel; S. A. Sabbagh; M. G. Bell; R. Bell; N. Bretz; R. Budny; M. S. Chance; E. D. Fredrickson; R. Hatcher; R. J. Hawryluk; A. C. Janos; S. C. Jardin; D. L. Jassby; D. C. McCune

Study of high poloidal beta plasmas in TFTR and DIII-D

G. A. Navratil, R. A. Gross, M. E. Mauel, S. A. Sabbagh, M. G. Bell, R. Bell, N. Bretz, R. Budny, M. S. Chance, E. D. Fredrickson, R. Hatcher, R. J. Hawryluk, A. C. Janos, S. C. Jardin, D. L. Jassby, D. C. McCune

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

9 Scopus citations

Abstract

Tokamak equilibria with poloidal beta larger than R/a have been produced in neutral beam heated discharges in TFTR and DIII-D. Values of εβ_p,dia as large as 1.5 were attained in TFTR with a natural inboard poloidal field null produced inside the vacuum chamber causing a transition to a diverted discharge. In DII-D β_p=5.1 and εβ_p=1.8 were reached with significant equilibrium modification. Both machines operate near the equilibrium limit at high q* and approach β_N approximately 4 at lower q*. Energy confinement was observed to be enhanced to more than 3 times L-mode values. In TFTR large stored energy up to 2.5 MJ at 0.85 MA was produced with a measured Q_DD = 1.1 × 10^-3. Experiments on DIII-D and TFTR have shown sustained periods of negative loop voltage with the calculation of substantial bootstrap current.

Original language	English (US)
Title of host publication	Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res
Publisher	Publ by IAEA
Pages	209-218
Number of pages	10
ISBN (Print)	9201300913
State	Published - 1991
Externally published	Yes

Publication series

Name	Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

All Science Journal Classification (ASJC) codes

General Engineering

Cite this

Navratil, G. A., Gross, R. A., Mauel, M. E., Sabbagh, S. A., Bell, M. G., Bell, R., Bretz, N., Budny, R., Chance, M. S., Fredrickson, E. D., Hatcher, R., Hawryluk, R. J., Janos, A. C., Jardin, S. C., Jassby, D. L., & McCune, D. C. (1991). Study of high poloidal beta plasmas in TFTR and DIII-D. In Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res (pp. 209-218). (Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res). Publ by IAEA.

@inproceedings{957be92a74a141418bde75dcb050b274,

title = "Study of high poloidal beta plasmas in TFTR and DIII-D",

abstract = "Tokamak equilibria with poloidal beta larger than R/a have been produced in neutral beam heated discharges in TFTR and DIII-D. Values of εβp,dia as large as 1.5 were attained in TFTR with a natural inboard poloidal field null produced inside the vacuum chamber causing a transition to a diverted discharge. In DII-D βp=5.1 and εβp=1.8 were reached with significant equilibrium modification. Both machines operate near the equilibrium limit at high q* and approach βN approximately 4 at lower q*. Energy confinement was observed to be enhanced to more than 3 times L-mode values. In TFTR large stored energy up to 2.5 MJ at 0.85 MA was produced with a measured QDD = 1.1 × 10-3. Experiments on DIII-D and TFTR have shown sustained periods of negative loop voltage with the calculation of substantial bootstrap current.",

author = "Navratil, \{G. A.\} and Gross, \{R. A.\} and Mauel, \{M. E.\} and Sabbagh, \{S. A.\} and Bell, \{M. G.\} and R. Bell and N. Bretz and R. Budny and Chance, \{M. S.\} and Fredrickson, \{E. D.\} and R. Hatcher and Hawryluk, \{R. J.\} and Janos, \{A. C.\} and Jardin, \{S. C.\} and Jassby, \{D. L.\} and McCune, \{D. C.\}",

year = "1991",

language = "English (US)",

isbn = "9201300913",

series = "Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res",

publisher = "Publ by IAEA",

pages = "209--218",

booktitle = "Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res",

}

Navratil, GA, Gross, RA, Mauel, ME, Sabbagh, SA, Bell, MG, Bell, R, Bretz, N, Budny, R, Chance, MS, Fredrickson, ED, Hatcher, R, Hawryluk, RJ, Janos, AC, Jardin, SC, Jassby, DL & McCune, DC 1991, Study of high poloidal beta plasmas in TFTR and DIII-D. in Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res. Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res, Publ by IAEA, pp. 209-218.

TY - GEN

T1 - Study of high poloidal beta plasmas in TFTR and DIII-D

AU - Navratil, G. A.

AU - Gross, R. A.

AU - Mauel, M. E.

AU - Sabbagh, S. A.

AU - Bell, M. G.

AU - Bell, R.

AU - Bretz, N.

AU - Budny, R.

AU - Chance, M. S.

AU - Fredrickson, E. D.

AU - Hatcher, R.

AU - Hawryluk, R. J.

AU - Janos, A. C.

AU - Jardin, S. C.

AU - Jassby, D. L.

AU - McCune, D. C.

PY - 1991

Y1 - 1991

N2 - Tokamak equilibria with poloidal beta larger than R/a have been produced in neutral beam heated discharges in TFTR and DIII-D. Values of εβp,dia as large as 1.5 were attained in TFTR with a natural inboard poloidal field null produced inside the vacuum chamber causing a transition to a diverted discharge. In DII-D βp=5.1 and εβp=1.8 were reached with significant equilibrium modification. Both machines operate near the equilibrium limit at high q* and approach βN approximately 4 at lower q*. Energy confinement was observed to be enhanced to more than 3 times L-mode values. In TFTR large stored energy up to 2.5 MJ at 0.85 MA was produced with a measured QDD = 1.1 × 10-3. Experiments on DIII-D and TFTR have shown sustained periods of negative loop voltage with the calculation of substantial bootstrap current.

AB - Tokamak equilibria with poloidal beta larger than R/a have been produced in neutral beam heated discharges in TFTR and DIII-D. Values of εβp,dia as large as 1.5 were attained in TFTR with a natural inboard poloidal field null produced inside the vacuum chamber causing a transition to a diverted discharge. In DII-D βp=5.1 and εβp=1.8 were reached with significant equilibrium modification. Both machines operate near the equilibrium limit at high q* and approach βN approximately 4 at lower q*. Energy confinement was observed to be enhanced to more than 3 times L-mode values. In TFTR large stored energy up to 2.5 MJ at 0.85 MA was produced with a measured QDD = 1.1 × 10-3. Experiments on DIII-D and TFTR have shown sustained periods of negative loop voltage with the calculation of substantial bootstrap current.

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M3 - Conference contribution

AN - SCOPUS:0025748479

SN - 9201300913

T3 - Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

SP - 209

EP - 218

BT - Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

PB - Publ by IAEA

ER -

Study of high poloidal beta plasmas in TFTR and DIII-D

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