Effect of the scrape-off layer in AORSA full wave simulations of fast wave minority, mid/high harmonic, and helicon heating regimes

被引：3

作者：

Bertelli, N. ^{[1
]}

Jaeger, E. F. ^{[2
]}

Lau, C. ^{[3
]}

Blazevski, D. ^{[3
]}

Green, D. L. ^{[3
]}

Berry, L. ^{[3
]}

Bonoli, P. T. ^{[4
]}

Gerhardt, S. ^{[1
]}

Hosea, J. C. ^{[1
]}

LeBlanc, B. ^{[1
]}

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

Phillips, C. K. ^{[1
]}

Pinsker, R. I. ^{[5
]}

Prater, R. ^{[5
]}

Qin, C. M. ^{[6
]}

Ryan, P. M. ^{[3
]}

Taylor, G. ^{[1
]}

Valeo, E. J. ^{[1
]}

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

Wright, J. C. ^{[4
]}

Zhang, X. J. ^{[6
]}

机构：

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

[2] XCEL Engn Inc, Oak Ridge, TN 37830 USA

[3] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

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

[5] Gen Atom Co, San Diego, CA 92186 USA

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

来源：

RADIOFREQUENCY POWER IN PLASMAS | 2015年 / 1689卷

关键词：

PLASMAS;

D O I：

10.1063/1.4936475

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Several experiments on different machines and in different fast wave (FW) heating regimes, such as hydrogen minority heating and high harmonic fast waves, have found strong interactions between radio-frequency (RF) waves and the scrape-off layer (SOL) region. This paper examines the propagation and the power loss in the SOL by using the full wave code AORSA, in which the edge plasma beyond the last closed flux surface (LCFS) is included in the solution domain and a collisional damping parameter is used as a proxy to represent the real, and most likely nonlinear, damping processes. 3D AORSA results for the National Spherical Torus eXperiment (NSTX), where a full antenna spectrum is reconstructed, are shown, confirming the same behavior found for a single toroidal mode results in Bertelli et al, Nucl. Fusion, 54 083004, 2014, namely, a strong transition to higher SOL power losses (driven by the RF field) when the FW cut-off is moved away from in front of the antenna by increasing the edge density. Additionally, full wave simulations have been extended to "conventional" tokamaks with higher aspect ratios, such as the DIII-D, Alcator C-Mod, and EAST devices. DIII-D results show similar behavior found in NSTX and NSTX-U, consistent with previous DIII-D experimental observations. In contrast, a different behavior has been found for Alcator C-Mod and EAST, which operate in the minority heating regime unlike NSTX/NSTX-U and DIII-D, which operate in the mid/high harmonic regime. A substantial discussion of some of the main aspects, such as (i) the pitch angle of the magnetic field; (ii) minority heating vs. mid/high harmonic regimes is presented showing the different behavior of the RF field in the SOL region for NSTX-U scenarios with different plasma current. Finally, the preliminary results of the impact of the SOL region on the evaluation of the helicon current drive efficiency in DIII-D is presented for the first time and briefly compared with the different regimes mentioned above.

引用

页数：8

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