Joint DIII-D/EAST research on the development of a high poloidal beta scenario for the steady state missions of ITER and CFETR

被引：42

作者：

Garofalo, A. M. ^{[1
]}

Gong, X. Z. ^{[2
]}

Ding, S. Y. ^{[2
]}

Huang, J. ^{[2
]}

McClenaghan, J. ^{[3
]}

Pan, C. K. ^{[2
]}

Qian, J. ^{[2
]}

Ren, Q. L. ^{[2
]}

Staebler, G. M. ^{[2
]}

Chen, J. ^{[2
]}

Cui, L. ^{[4
]}

Grierson, B. A.

Hanson, J. M. ^{[5
]}

Holcomb, C. T. ^{[6
]}

Jian, X. ^{[7
]}

Li, G. ^{[2
]}

Li, M. ^{[2
]}

Pankin, A. Y. ^{[6
]}

Peysson, Y. ^{[8
]}

Zhai, X. ^{[2
]}

Bonoli, P. ^{[9
]}

Brower, D. ^{[10
]}

Ding, W. X. ^{[10
]}

Ferron, J. R. ^{[1
]}

Guo, W. ^{[2
]}

Lao, L. L. ^{[1
]}

Li, K. ^{[2
]}

Liu, H. ^{[2
]}

Lyv, B. ^{[2
]}

Xu, G. ^{[2
]}

Zang, Q. ^{[2
]}

机构：

[1] Gen Atom, San Diego, CA 92186 USA

[2] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China

[3] Oak Ridge Associated Univ, Oak Ridge, TN USA

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

[5] Columbia Univ, New York, NY USA

[6] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[7] Huazhong Univ Sci & Technol, Wuhan 430074, Hubei, Peoples R China

[8] CEA, IRFM, F-13108 St Paul Les Durance, France

[9] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

[10] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2018年 / 60卷 / 01期

关键词：

tokamak; steady state; ITB; high bootstrap current; HIGH CONFINEMENT; PLASMAS; PHYSICS; SIMULATIONS; STATIONARY; STABILITY; FRACTION;

D O I：

10.1088/1361-6587/aa8c9d

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Experimental and modeling investigations on the DIII-D and EAST tokamaks show the attractive transport and stability properties of fully noninductive, high poloidal-beta (beta(P)) plasmas, and their suitability for steady-state operating scenarios in ITER and CFETR. A key feature of the high-beta(P) regime is the large-radius (rho > 0.6) internal transport barrier (ITB), often observed in all channels (ne, Te, Ti, rotation), and responsible for both excellent energy confinement quality and excellent stability properties. Experiments on DIII-D have shown that, with a large-radius ITB, very high beta(N) and beta(P) values (both >= 4) can be reached by taking advantage of the stabilizing effect of a nearby conducting wall. Synergistically, higher plasma pressure provides turbulence suppression by Shafranov shift, leading to ITB sustainment independent of the plasma rotation. Experiments on EAST have been used to assess the long pulse potential of the high-beta(P) regime. Using RF-only heating and current drive, EAST achieved minute-long fully noninductive steady state H-mode operation with strike points on an ITER-like tungsten divertor. Improved confinement (relative to standard H-mode) and steady state ITB features are observed with a monotonic q-profile with q(min) similar to 1.5. Separately, experiments have shown that increasing the density in plasmas driven by lower hybrid wave broadens the q-profile, a technique that could enable a large radius ITB. These experimental results have been used to validate MHD, current drive, and turbulent transport models, and to project the high-beta(P) regime to a burning plasma. These projections suggest the Shafranov shift alone will not suffice to provide improved confinement (over standard H-mode) without rotation and rotation shear. However, increasing the negative magnetic shear (higher q on axis) provides a similar turbulence suppression mechanism to Shafranov shift, and can help devices such as ITER and CFETR achieve their steady-state fusion goals.

引用

页数：13

共 49 条

[1] Gyrofluid simulations of turbulence suppression in reversed-shear experiments on the tokamak fusion test reactor [J].

Beer, MA ;

Hammett, GW ;

Rewoldt, G ;

Synakowski, EJ ;

Zarnstorff, MC ;

Dorland, W .

PHYSICS OF PLASMAS, 1997, 4 (05) :1792-1799

[2] Full linearized Fokker-Planck collisions in neoclassical transport simulations [J].

Belli, E. A. ;

Candy, J. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2012, 54 (01)

[3] GATO - AN MHD STABILITY CODE FOR AXISYMMETRIC PLASMAS WITH INTERNAL SEPARATRICES [J].

BERNARD, LC ;

HELTON, FJ ;

MOORE, RW .

COMPUTER PHYSICS COMMUNICATIONS, 1981, 24 (3-4) :377-380

[4] An Eulerian gyrokinetic-Maxwell solver [J].

Candy, J ;

Waltz, RE .

JOURNAL OF COMPUTATIONAL PHYSICS, 2003, 186 (02) :545-581

[5] Tokamak profile prediction using direct gyrokinetic and neoclassical simulation [J].

Candy, J. ;

Holland, C. ;

Waltz, R. E. ;

Fahey, M. R. ;

Belli, E. .

PHYSICS OF PLASMAS, 2009, 16 (06)

[6] A review of internal transport barrier physics for steady-state operation of tokamaks [J].

Connor, JW ;

Fukuda, T ;

Garbet, X ;

Gormezano, C ;

Mukhovatov, V ;

Wakatani, M .

NUCLEAR FUSION, 2004, 44 (04) :R1-R49

[7] Confinement improvement in the high poloidal beta regime on DIII-D and application to steady-state H-mode on EAST [J].

Ding, S. ;

Garofalo, A. M. ;

Qian, J. ;

Cui, L. ;

McClenaghan, J. T. ;

Pan, C. ;

Chen, J. ;

Zhai, X. ;

McKee, G. ;

Ren, Q. ;

Gong, X. ;

Holcomb, C. T. ;

Guo, W. ;

Lao, L. ;

Ferron, J. ;

Hyatt, A. ;

Staebler, G. ;

Solomon, W. ;

Du, H. ;

Zang, Q. ;

Huang, J. ;

Wan, B. .

PHYSICS OF PLASMAS, 2017, 24 (05)

[8] Sustainment of high confinement in JT-60U reversed shear plasmas [J].

Fujita, T ;

Kamada, Y ;

Ide, S ;

Takeji, S ;

Sakamoto, Y ;

Isayama, A ;

Suzuki, T ;

Oikawa, T ;

Fukuda, T .

NUCLEAR FUSION, 2002, 42 (02) :180-186

[9] Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST [J].

Garofalo, A. M. ;

Gong, X. Z. ;

Qian, J. ;

Chen, J. ;

Li, G. ;

Li, K. ;

Li, M. H. ;

Zhai, X. ;

Bonoli, P. ;

Brower, D. ;

Cao, L. ;

Cui, L. ;

Ding, S. ;

Ding, W. X. ;

Guo, W. ;

Holcomb, C. ;

Huang, J. ;

Hyatt, A. ;

Lanctot, M. ;

Lao, L. L. ;

Liu, H. ;

Lyu, B. ;

McClenaghan, J. ;

Peysson, Y. ;

Ren, Q. ;

Shiraiwa, S. ;

Solomon, W. ;

Zang, Q. ;

Wan, B. .

NUCLEAR FUSION, 2017, 57 (07)

[10] Compatibility of internal transport barrier with steady-state operation in the high bootstrap fraction regime on DIII-D [J].

Garofalo, A. M. ;

Gong, X. ;

Grierson, B. A. ;

Ren, Q. ;

Solomon, W. M. ;

Strait, E. J. ;

Van Zeeland, M. A. ;

Holcomb, C. T. ;

Meneghini, O. ;

Smith, S. P. ;

Staebler, G. M. ;

Wan, B. ;

Bravenec, R. ;

Budny, R. V. ;

Ding, S. ;

Hanson, J. M. ;

Heidbrink, W. W. ;

Lao, L. L. ;

Li, G. ;

Pan, C. ;

Petty, C. C. ;

Qian, J. ;

Paz-Soldan, C. ;

Xu, G. .

NUCLEAR FUSION, 2015, 55 (12)

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