Investigation of oxygen impurity transport using the O4+ visible spectral line in the Aditya tokamak

被引：27

作者：

Chowdhuri, M. B. ^{[1
]}

Ghosh, J. ^{[1
]}

Banerjee, S. ^{[1
]}

Dey, Ritu ^{[1
]}

Manchanda, R. ^{[1
]}

Kumar, Vinay ^{[1
]}

Vasu, P. ^{[1
]}

Patel, K. M. ^{[1
]}

Atrey, P. K. ^{[1
]}

Joisa, Y. Shankara ^{[1
]}

Rao, C. V. S. ^{[1
]}

Tanna, R. L. ^{[1
]}

Raju, D. ^{[1
]}

Chattopadhyay, P. K. ^{[1
]}

Jha, R. ^{[1
]}

Gupta, C. N. ^{[1
]}

Bhatt, S. B. ^{[1
]}

Saxena, Y. C. ^{[1
]}

机构：

[1] Inst Plasma Res, Bhat 382428, Gandhinagar, India

来源：

NUCLEAR FUSION | 2013年 / 53卷 / 02期

关键词：

SCRAPE-OFF-LAYER; ALCATOR C-MOD; PLASMA ROTATION; TURBULENCE; FLUCTUATIONS; TRANSITION; ION;

D O I：

10.1088/0029-5515/53/2/023006

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：

Intense visible lines from Be-like oxygen impurity are routinely observed in the Aditya tokamak. The spatial profile of brightness of a Be-like oxygen spectral line (2p3p D-3(3)-2p3d F-3(4)) at 650.024 nm is used to investigate oxygen impurity transport in typical discharges of the Aditya tokamak. A 1.0m multi-track spectrometer (Czerny-Turner) capable of simultaneous measurements from eight lines of sight is used to obtain the radial profile of brightness of O4+ spectral emission. The emissivity profile of O4+ spectral emission is obtained from the spatial profile of brightness using an Abel-like matrix inversion. The oxygen transport coefficients are determined by reproducing the experimentally measured emissivity profiles of O4+, using a one-dimensional empirical impurity transport code, STRAHL. Much higher values of the diffusion coefficient compared with the neo-classical values are observed in both the high magnetic field edge region (D-inboard(max) similar to 30 m(2) s(-1)) and the low magnetic field edge region (D-outboard(max) similar to 45 m(2) s(-1)) of typical Aditya ohmic plasmas, which seems to be due to fluctuation-induced transport. The diffusion coefficient at the limiter radius in the low-field (outboard) region is typically similar to twice as high as that at the limiter radius in the high-field (inboard) region.

引用

页数：8

共 38 条

[21] NEOCLASSICAL TRANSPORT OF IMPURITIES IN TOKAMAK PLASMAS [J].