Dimits shift in realistic gyrokinetic plasma-turbulence simulations

被引：33

作者：

Mikkelsen, D. R. ^{[1
]}

Dorland, W. ^{[2
]}

机构：

[1] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[2] Univ Maryland, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.101.135003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In simulations of turbulent plasma transport due to long wavelength (k perpendicular to p(i) <= 1) electrostatic drift-type instabilities, we find a persistent nonlinear up-shift of the effective threshold. Next-generation tokamaks will likely benefit from the higher effective threshold for turbulent transport, and transport models should incorporate suitable corrections to linear thresholds. The gyrokinetic simulations reported here are more realistic than previous reports of a Dimits shift because they include nonadiabatic electron dynamics, strong collisional damping of zonal flows, and finite electron and ion collisionality together with realistic shaped magnetic geometry. Reversing previously reported results based on idealized adiabatic electrons, we find that increasing collisionality reduces the heat flux because collisionality reduces the nonadiabatic electron microinstability drive.

引用

页数：4

共 27 条

[1] Effects of plasma shaping on nonlinear gyrokinetic turbulence [J].

Belli, E. A. ;

Hammett, G. W. ;

Dorland, W. .

PHYSICS OF PLASMAS, 2008, 15 (09)

[2] The International Multi-Tokamak Profile Database [J].

Boucher, D ;

Connor, JW ;

Houlberg, WA ;

Turner, MF ;

Bracco, G ;

Chudnovskiy, A ;

Cordey, JG ;

Greenwald, MJ ;

Hoang, GT ;

Hogeweij, GMD ;

Kaye, SM ;

Kinsey, JE ;

Mikkelsen, DR ;

Ongena, J ;

Schissel, DR ;

Shirai, H ;

Stober, J ;

Subberfield, PM ;

Waltz, RE ;

Weiland, J .

NUCLEAR FUSION, 2000, 40 (12) :1955-1981

[3] The effect of ion-scale dynamics on electron-temperature-gradient turbulence [J].

Candy, J. ;

Waltz, R. E. ;

Fahey, M. R. ;

Holland, C. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2007, 49 (08) :1209-1220

[4] The local limit of global gyrokinetic simulations [J].

Candy, J ;

Waltz, RE ;

Dorland, W .

PHYSICS OF PLASMAS, 2004, 11 (05) :L25-L28

[5] Gyrokinetic turbulence simulations with kinetic electrons [J].

Chen, Y ;

Parker, S .

PHYSICS OF PLASMAS, 2001, 8 (05) :2095-2100

[6] CONSIDERATIONS OF ION-TEMPERATURE-GRADIENT-DRIVEN TURBULENCE [J].

COWLEY, SC ;

KULSRUD, RM ;

SUDAN, R .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1991, 3 (10) :2767-2782

[7] Zonal flows in plasma - a review [J].

Diamond, PH ;

Itoh, SI ;

Itoh, K ;

Hahm, TS .

PLASMA PHYSICS AND CONTROLLED FUSION, 2005, 47 (05) :R35-R161

[8] Comparisons and physics basis of tokamak transport models and turbulence simulations [J].

Dimits, AM ;

Bateman, G ;

Beer, MA ;

Cohen, BI ;

Dorland, W ;

Hammett, GW ;

Kim, C ;

Kinsey, JE ;

Kotschenreuther, M ;

Kritz, AH ;

Lao, LL ;

Mandrekas, J ;

Nevins, WM ;

Parker, SE ;

Redd, AJ ;

Shumaker, DE ;

Sydora, R ;

Weiland, J .

PHYSICS OF PLASMAS, 2000, 7 (03) :969-983

[9] Chapter 2: Plasma confinement and transport [J].

Department of Electrical Engineering, PSTI, University of California, Los Angeles, CA, United States ;

不详 ;

不详 .

Nucl Fusion, 2007, 6 (S18-S127) :S18-S127

[10] Density profile peaking in low collisionality H-modes: comparison of Alcator C-Mod data to ASDEX Upgrade/JET scalings [J].

Greenwald, M. ;

Angioni, C. ;

Hughes, J. W. ;

Terry, J. ;

Weisen, H. .

NUCLEAR FUSION, 2007, 47 (09) :L26-L29

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