Electron temperature fluctuations associated with the weakly coherent mode in the edge of I-mode plasmas

被引：38
|
作者：
White, A. E. [1 ]
Phillips, P. [2 ]
Whyte, D. G. [1 ]
Hubbard, A. E. [1 ]
Sung, C. [1 ]
Hughes, J. W. [1 ]
Dominguez, A. [1 ]
Terry, J. [1 ]
Cziegler, I. [1 ]
机构：
[1] MIT, Cambridge, MA 02139 USA
[2] Univ Texas Austin, Austin, TX 78712 USA
来源：
NUCLEAR FUSION | 2011年 / 51卷 / 11期
关键词：
ALCATOR C-MOD; CYCLOTRON EMISSION; CORRELATION RADIOMETRY; H-MODE; TRANSPORT; DENSITY; CORE; ECE; SIGNATURE; PROFILE;
D O I：
10.1088/0029-5515/51/11/113005
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：
New measurements of electron temperature fluctuations associated with the weakly coherent mode (WCM) during improved mode, or I-mode plasmas (Whyte et al 2010 Nucl. Fusion. 50 105005) at Alcator C-Mod (Marmar et al 2007 Fusion. Sci. Technol. 51 3261) are presented in this paper. The measurements are made with a 32-channel, high-resolution profile electron cyclotron emission radiometer. The WCM electron temperature fluctuations are localized to a 1 cm region inside the last closed flux surface. The WCM electron temperature fluctuation level is measured in several different I-mode discharges and is in the range 1% < T(e)/T(e) < 2%, which is an order of magnitude smaller than the WCM density fluctuation level. The WCM edge fluctuations observed in I-mode are believed to play a role in increasing particle transport but not energy transport in the edge of I-mode plasmas. The large difference between normalized density and electron temperature fluctuation amplitudes provides new evidence that the WCM fluctuations can separately affect energy and particle transport.
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页数：9
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