High- Β, improved confinement reversed-field pinch plasmas at high density

M. D. Wyman; B. E. Chapman; J. W. Ahn; A. F. Almagri; J. K. Anderson; F. Bonomo; D. L. Brower; S. K. Combs; D. Craig; D. J. Den Hartog; B. H. Deng; W. X. Ding; F. Ebrahimi; D. A. Ennis; G. Fiksel; C. R. Foust; P. Franz; S. Gangadhara; J. A. Goetz; R. O'Connell; S. P. Oliva; S. C. Prager; J. A. Reusch; J. S. Sarff; H. D. Stephens; T. Yates

doi:10.1063/1.2835439

High- Β, improved confinement reversed-field pinch plasmas at high density

M. D. Wyman, B. E. Chapman, J. W. Ahn, A. F. Almagri, J. K. Anderson, F. Bonomo, D. L. Brower, S. K. Combs, D. Craig, D. J. Den Hartog, B. H. Deng, W. X. Ding, F. Ebrahimi, D. A. Ennis, G. Fiksel, C. R. Foust, P. Franz, S. Gangadhara, J. A. Goetz, R. O'ConnellS. P. Oliva, S. C. Prager, J. A. Reusch, J. S. Sarff, H. D. Stephens, T. Yates

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

17 Scopus citations

Abstract

In Madison Symmetric Torus [Dexter, Fusion Technol. 19, 131 (1991)] discharges where improved confinement is brought about by modification of the current profile, pellet injection has quadrupled the density, reaching ne =4× 1019 m-3. Without pellet injection, the achievable density in improved confinement discharges had been limited by edge-resonant tearing instability. With pellet injection, the total beta has been increased to 26%, and the energy confinement time is comparable to that at low density. Pressure-driven local interchange and global tearing are predicted to be linearly unstable. Interchange has not yet been observed experimentally, but there is possible evidence of pressure-driven tearing, an instability usually driven by the current gradient in the reversed-field pinch.

Original language	English (US)
Article number	010701
Journal	Physics of Plasmas
Volume	15
Issue number	1
DOIs	https://doi.org/10.1063/1.2835439
State	Published - 2008

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

Access to Document

10.1063/1.2835439

Cite this

Wyman, M. D., Chapman, B. E., Ahn, J. W., Almagri, A. F., Anderson, J. K., Bonomo, F., Brower, D. L., Combs, S. K., Craig, D., Den Hartog, D. J., Deng, B. H., Ding, W. X., Ebrahimi, F., Ennis, D. A., Fiksel, G., Foust, C. R., Franz, P., Gangadhara, S., Goetz, J. A., ... Yates, T. (2008). High- Β, improved confinement reversed-field pinch plasmas at high density. Physics of Plasmas, 15(1), Article 010701. https://doi.org/10.1063/1.2835439

@article{54e6ab2a62ab4c149093e1ecab02bb36,

title = "High- Β, improved confinement reversed-field pinch plasmas at high density",

abstract = "In Madison Symmetric Torus [Dexter, Fusion Technol. 19, 131 (1991)] discharges where improved confinement is brought about by modification of the current profile, pellet injection has quadrupled the density, reaching ne =4× 1019 m-3. Without pellet injection, the achievable density in improved confinement discharges had been limited by edge-resonant tearing instability. With pellet injection, the total beta has been increased to 26%, and the energy confinement time is comparable to that at low density. Pressure-driven local interchange and global tearing are predicted to be linearly unstable. Interchange has not yet been observed experimentally, but there is possible evidence of pressure-driven tearing, an instability usually driven by the current gradient in the reversed-field pinch.",

author = "Wyman, {M. D.} and Chapman, {B. E.} and Ahn, {J. W.} and Almagri, {A. F.} and Anderson, {J. K.} and F. Bonomo and Brower, {D. L.} and Combs, {S. K.} and D. Craig and {Den Hartog}, {D. J.} and Deng, {B. H.} and Ding, {W. X.} and F. Ebrahimi and Ennis, {D. A.} and G. Fiksel and Foust, {C. R.} and P. Franz and S. Gangadhara and Goetz, {J. A.} and R. O'Connell and Oliva, {S. P.} and Prager, {S. C.} and Reusch, {J. A.} and Sarff, {J. S.} and Stephens, {H. D.} and T. Yates",

note = "Funding Information: This work is supported by the U.S. Department of Energy.",

year = "2008",

doi = "10.1063/1.2835439",

language = "English (US)",

volume = "15",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "1",

}

Wyman, MD, Chapman, BE, Ahn, JW, Almagri, AF, Anderson, JK, Bonomo, F, Brower, DL, Combs, SK, Craig, D, Den Hartog, DJ, Deng, BH, Ding, WX, Ebrahimi, F, Ennis, DA, Fiksel, G, Foust, CR, Franz, P, Gangadhara, S, Goetz, JA, O'Connell, R, Oliva, SP, Prager, SC, Reusch, JA, Sarff, JS, Stephens, HD & Yates, T 2008, 'High- Β, improved confinement reversed-field pinch plasmas at high density', Physics of Plasmas, vol. 15, no. 1, 010701. https://doi.org/10.1063/1.2835439

TY - JOUR

T1 - High- Β, improved confinement reversed-field pinch plasmas at high density

AU - Wyman, M. D.

AU - Chapman, B. E.

AU - Ahn, J. W.

AU - Almagri, A. F.

AU - Anderson, J. K.

AU - Bonomo, F.

AU - Brower, D. L.

AU - Combs, S. K.

AU - Craig, D.

AU - Den Hartog, D. J.

AU - Deng, B. H.

AU - Ding, W. X.

AU - Ebrahimi, F.

AU - Ennis, D. A.

AU - Fiksel, G.

AU - Foust, C. R.

AU - Franz, P.

AU - Gangadhara, S.

AU - Goetz, J. A.

AU - O'Connell, R.

AU - Oliva, S. P.

AU - Prager, S. C.

AU - Reusch, J. A.

AU - Sarff, J. S.

AU - Stephens, H. D.

AU - Yates, T.

N1 - Funding Information: This work is supported by the U.S. Department of Energy.

PY - 2008

Y1 - 2008

N2 - In Madison Symmetric Torus [Dexter, Fusion Technol. 19, 131 (1991)] discharges where improved confinement is brought about by modification of the current profile, pellet injection has quadrupled the density, reaching ne =4× 1019 m-3. Without pellet injection, the achievable density in improved confinement discharges had been limited by edge-resonant tearing instability. With pellet injection, the total beta has been increased to 26%, and the energy confinement time is comparable to that at low density. Pressure-driven local interchange and global tearing are predicted to be linearly unstable. Interchange has not yet been observed experimentally, but there is possible evidence of pressure-driven tearing, an instability usually driven by the current gradient in the reversed-field pinch.

AB - In Madison Symmetric Torus [Dexter, Fusion Technol. 19, 131 (1991)] discharges where improved confinement is brought about by modification of the current profile, pellet injection has quadrupled the density, reaching ne =4× 1019 m-3. Without pellet injection, the achievable density in improved confinement discharges had been limited by edge-resonant tearing instability. With pellet injection, the total beta has been increased to 26%, and the energy confinement time is comparable to that at low density. Pressure-driven local interchange and global tearing are predicted to be linearly unstable. Interchange has not yet been observed experimentally, but there is possible evidence of pressure-driven tearing, an instability usually driven by the current gradient in the reversed-field pinch.

UR - http://www.scopus.com/inward/record.url?scp=38849090608&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38849090608&partnerID=8YFLogxK

U2 - 10.1063/1.2835439

DO - 10.1063/1.2835439

M3 - Article

AN - SCOPUS:38849090608

SN - 1070-664X

VL - 15

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 1

M1 - 010701

ER -

High- Β, improved confinement reversed-field pinch plasmas at high density

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this